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<div class="section" id="additional-examples">
<h1>Additional examples<a class="headerlink" href="#additional-examples" title="Permalink to this headline">¶</a></h1>
<p>The following examples are included in the SimPy source distribution.</p>
<div class="section" id="car">
<h2>Car<a class="headerlink" href="#car" title="Permalink to this headline">¶</a></h2>
<div class="highlight-python" id="index-0"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">SimPy.Simulation</span> <span class="kn">import</span> <span class="n">Process</span><span class="p">,</span> <span class="n">activate</span><span class="p">,</span> <span class="n">hold</span><span class="p">,</span> <span class="n">initialize</span><span class="p">,</span> <span class="n">now</span><span class="p">,</span> <span class="n">simulate</span>
<span class="k">class</span> <span class="nc">Car</span><span class="p">(</span><span class="n">Process</span><span class="p">):</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="p">,</span> <span class="n">cc</span><span class="p">):</span>
<span class="n">Process</span><span class="o">.</span><span class="n">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="o">=</span><span class="n">name</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">cc</span> <span class="o">=</span> <span class="n">cc</span>
<span class="k">def</span> <span class="nf">go</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">print</span><span class="p">(</span><span class="s">'</span><span class="si">%s</span><span class="s"> </span><span class="si">%s</span><span class="s"> </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="p">(</span><span class="n">now</span><span class="p">(),</span> <span class="bp">self</span><span class="o">.</span><span class="n">name</span><span class="p">,</span> <span class="s">'Starting'</span><span class="p">))</span>
<span class="k">yield</span> <span class="n">hold</span><span class="p">,</span> <span class="bp">self</span><span class="p">,</span> <span class="mf">100.0</span>
<span class="k">print</span><span class="p">(</span><span class="s">'</span><span class="si">%s</span><span class="s"> </span><span class="si">%s</span><span class="s"> </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="p">(</span><span class="n">now</span><span class="p">(),</span> <span class="bp">self</span><span class="o">.</span><span class="n">name</span><span class="p">,</span> <span class="s">'Arrived'</span><span class="p">))</span>
<span class="n">initialize</span><span class="p">()</span>
<span class="n">c1</span> <span class="o">=</span> <span class="n">Car</span><span class="p">(</span><span class="s">'Car1'</span><span class="p">,</span> <span class="mi">2000</span><span class="p">)</span> <span class="c"># a new car</span>
<span class="n">activate</span><span class="p">(</span><span class="n">c1</span><span class="p">,</span> <span class="n">c1</span><span class="o">.</span><span class="n">go</span><span class="p">(),</span> <span class="n">at</span><span class="o">=</span><span class="mf">6.0</span><span class="p">)</span> <span class="c"># activate at time 6.0</span>
<span class="n">c2</span> <span class="o">=</span> <span class="n">Car</span><span class="p">(</span><span class="s">'Car2'</span><span class="p">,</span> <span class="mi">1600</span><span class="p">)</span> <span class="c"># another new car</span>
<span class="n">activate</span><span class="p">(</span><span class="n">c2</span><span class="p">,</span> <span class="n">c2</span><span class="o">.</span><span class="n">go</span><span class="p">())</span> <span class="c"># activate at time 0</span>
<span class="n">simulate</span><span class="p">(</span><span class="n">until</span><span class="o">=</span><span class="mi">200</span><span class="p">)</span>
<span class="k">print</span><span class="p">(</span><span class="s">'Current time is </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="n">now</span><span class="p">())</span> <span class="c"># will print 106.0</span>
</pre></div>
</div>
<p>Output:</p>
<div class="highlight-python"><pre>0 Car2 Starting
6.0 Car1 Starting
100.0 Car2 Arrived
106.0 Car1 Arrived
Current time is 106.0
</pre>
</div>
</div>
<div class="section" id="cart">
<h2>CarT<a class="headerlink" href="#cart" title="Permalink to this headline">¶</a></h2>
<div class="highlight-python" id="index-1"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">SimPy.SimulationTrace</span> <span class="kn">import</span> <span class="p">(</span><span class="n">Process</span><span class="p">,</span> <span class="n">activate</span><span class="p">,</span> <span class="n">initialize</span><span class="p">,</span> <span class="n">hold</span><span class="p">,</span> <span class="n">now</span><span class="p">,</span>
<span class="n">simulate</span><span class="p">)</span>
<span class="k">class</span> <span class="nc">Car</span><span class="p">(</span><span class="n">Process</span><span class="p">):</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="p">,</span> <span class="n">cc</span><span class="p">):</span>
<span class="n">Process</span><span class="o">.</span><span class="n">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="o">=</span><span class="n">name</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">cc</span> <span class="o">=</span> <span class="n">cc</span>
<span class="k">def</span> <span class="nf">go</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">print</span><span class="p">(</span><span class="s">'</span><span class="si">%s</span><span class="s"> </span><span class="si">%s</span><span class="s"> </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="p">(</span><span class="n">now</span><span class="p">(),</span> <span class="bp">self</span><span class="o">.</span><span class="n">name</span><span class="p">,</span> <span class="s">'Starting'</span><span class="p">))</span>
<span class="k">yield</span> <span class="n">hold</span><span class="p">,</span> <span class="bp">self</span><span class="p">,</span> <span class="mf">100.0</span>
<span class="k">print</span><span class="p">(</span><span class="s">'</span><span class="si">%s</span><span class="s"> </span><span class="si">%s</span><span class="s"> </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="p">(</span><span class="n">now</span><span class="p">(),</span> <span class="bp">self</span><span class="o">.</span><span class="n">name</span><span class="p">,</span> <span class="s">'Arrived'</span><span class="p">))</span>
<span class="n">initialize</span><span class="p">()</span>
<span class="n">c1</span> <span class="o">=</span> <span class="n">Car</span><span class="p">(</span><span class="s">'Car1'</span><span class="p">,</span> <span class="mi">2000</span><span class="p">)</span> <span class="c"># a new car</span>
<span class="n">activate</span><span class="p">(</span><span class="n">c1</span><span class="p">,</span> <span class="n">c1</span><span class="o">.</span><span class="n">go</span><span class="p">(),</span> <span class="n">at</span><span class="o">=</span><span class="mf">6.0</span><span class="p">)</span> <span class="c"># activate at time 6.0</span>
<span class="n">c2</span> <span class="o">=</span> <span class="n">Car</span><span class="p">(</span><span class="s">'Car2'</span><span class="p">,</span> <span class="mi">1600</span><span class="p">)</span> <span class="c"># another new car</span>
<span class="n">activate</span><span class="p">(</span><span class="n">c2</span><span class="p">,</span> <span class="n">c2</span><span class="o">.</span><span class="n">go</span><span class="p">())</span> <span class="c"># activate at time 0</span>
<span class="n">simulate</span><span class="p">(</span><span class="n">until</span><span class="o">=</span><span class="mi">200</span><span class="p">)</span>
<span class="k">print</span><span class="p">(</span><span class="s">'Current time is </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="n">now</span><span class="p">())</span> <span class="c"># will print 106.0</span>
</pre></div>
</div>
<p>Output:</p>
<div class="highlight-python"><pre>0 activate <Car1> at time: 6.0 prior: False
0 activate <Car2> at time: 0 prior: False
0 Car2 Starting
0 hold <Car2> delay: 100.0
6.0 Car1 Starting
6.0 hold <Car1> delay: 100.0
100.0 Car2 Arrived
100.0 <Car2> terminated
106.0 Car1 Arrived
106.0 <Car1> terminated
Current time is 106.0
</pre>
</div>
</div>
<div class="section" id="cars">
<h2>Cars<a class="headerlink" href="#cars" title="Permalink to this headline">¶</a></h2>
<div class="highlight-python" id="index-2"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">SimPy.Simulation</span> <span class="kn">import</span> <span class="p">(</span><span class="n">Process</span><span class="p">,</span> <span class="n">Resource</span><span class="p">,</span> <span class="n">activate</span><span class="p">,</span> <span class="n">initialize</span><span class="p">,</span> <span class="n">hold</span><span class="p">,</span>
<span class="n">now</span><span class="p">,</span> <span class="n">release</span><span class="p">,</span> <span class="n">request</span><span class="p">,</span> <span class="n">simulate</span><span class="p">)</span>
<span class="k">class</span> <span class="nc">Car</span><span class="p">(</span><span class="n">Process</span><span class="p">):</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="p">,</span> <span class="n">cc</span><span class="p">):</span>
<span class="n">Process</span><span class="o">.</span><span class="n">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="o">=</span><span class="n">name</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">cc</span> <span class="o">=</span> <span class="n">cc</span>
<span class="k">def</span> <span class="nf">go</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">print</span><span class="p">(</span><span class="s">'</span><span class="si">%s</span><span class="s"> </span><span class="si">%s</span><span class="s"> </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="p">(</span><span class="n">now</span><span class="p">(),</span> <span class="bp">self</span><span class="o">.</span><span class="n">name</span><span class="p">,</span> <span class="s">'Starting'</span><span class="p">))</span>
<span class="k">yield</span> <span class="n">request</span><span class="p">,</span> <span class="bp">self</span><span class="p">,</span> <span class="n">gasstation</span>
<span class="k">print</span><span class="p">(</span><span class="s">'</span><span class="si">%s</span><span class="s"> </span><span class="si">%s</span><span class="s"> </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="p">(</span><span class="n">now</span><span class="p">(),</span> <span class="bp">self</span><span class="o">.</span><span class="n">name</span><span class="p">,</span> <span class="s">'Got a pump'</span><span class="p">))</span>
<span class="k">yield</span> <span class="n">hold</span><span class="p">,</span> <span class="bp">self</span><span class="p">,</span> <span class="mf">100.0</span>
<span class="k">yield</span> <span class="n">release</span><span class="p">,</span> <span class="bp">self</span><span class="p">,</span> <span class="n">gasstation</span>
<span class="k">print</span><span class="p">(</span><span class="s">'</span><span class="si">%s</span><span class="s"> </span><span class="si">%s</span><span class="s"> </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="p">(</span><span class="n">now</span><span class="p">(),</span> <span class="bp">self</span><span class="o">.</span><span class="n">name</span><span class="p">,</span> <span class="s">'Leaving'</span><span class="p">))</span>
<span class="n">gasstation</span> <span class="o">=</span> <span class="n">Resource</span><span class="p">(</span><span class="n">capacity</span><span class="o">=</span><span class="mi">2</span><span class="p">,</span> <span class="n">name</span><span class="o">=</span><span class="s">'gasStation'</span><span class="p">,</span> <span class="n">unitName</span><span class="o">=</span><span class="s">'pump'</span><span class="p">)</span>
<span class="n">initialize</span><span class="p">()</span>
<span class="n">c1</span> <span class="o">=</span> <span class="n">Car</span><span class="p">(</span><span class="s">'Car1'</span><span class="p">,</span> <span class="mi">2000</span><span class="p">)</span>
<span class="n">c2</span> <span class="o">=</span> <span class="n">Car</span><span class="p">(</span><span class="s">'Car2'</span><span class="p">,</span> <span class="mi">1600</span><span class="p">)</span>
<span class="n">c3</span> <span class="o">=</span> <span class="n">Car</span><span class="p">(</span><span class="s">'Car3'</span><span class="p">,</span> <span class="mi">3000</span><span class="p">)</span>
<span class="n">c4</span> <span class="o">=</span> <span class="n">Car</span><span class="p">(</span><span class="s">'Car4'</span><span class="p">,</span> <span class="mi">1600</span><span class="p">)</span>
<span class="n">activate</span><span class="p">(</span><span class="n">c1</span><span class="p">,</span> <span class="n">c1</span><span class="o">.</span><span class="n">go</span><span class="p">(),</span> <span class="n">at</span><span class="o">=</span><span class="mf">4.0</span><span class="p">)</span> <span class="c"># activate at time 4.0</span>
<span class="n">activate</span><span class="p">(</span><span class="n">c2</span><span class="p">,</span> <span class="n">c2</span><span class="o">.</span><span class="n">go</span><span class="p">())</span> <span class="c"># activate at time 0.0</span>
<span class="n">activate</span><span class="p">(</span><span class="n">c3</span><span class="p">,</span> <span class="n">c3</span><span class="o">.</span><span class="n">go</span><span class="p">(),</span> <span class="n">at</span><span class="o">=</span><span class="mf">3.0</span><span class="p">)</span> <span class="c"># activate at time 3.0</span>
<span class="n">activate</span><span class="p">(</span><span class="n">c4</span><span class="p">,</span> <span class="n">c4</span><span class="o">.</span><span class="n">go</span><span class="p">(),</span> <span class="n">at</span><span class="o">=</span><span class="mf">3.0</span><span class="p">)</span> <span class="c"># activate at time 2.0</span>
<span class="n">simulate</span><span class="p">(</span><span class="n">until</span><span class="o">=</span><span class="mi">300</span><span class="p">)</span>
<span class="k">print</span><span class="p">(</span><span class="s">'Current time is </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="n">now</span><span class="p">())</span>
</pre></div>
</div>
<p>Output:</p>
<div class="highlight-python"><pre>0 Car2 Starting
0 Car2 Got a pump
3.0 Car3 Starting
3.0 Car3 Got a pump
3.0 Car4 Starting
4.0 Car1 Starting
100.0 Car2 Leaving
100.0 Car4 Got a pump
103.0 Car3 Leaving
103.0 Car1 Got a pump
200.0 Car4 Leaving
203.0 Car1 Leaving
Current time is 203.0
</pre>
</div>
</div>
<div class="section" id="carst">
<h2>CarsT<a class="headerlink" href="#carst" title="Permalink to this headline">¶</a></h2>
<div class="highlight-python" id="index-3"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">SimPy.SimulationTrace</span> <span class="kn">import</span> <span class="p">(</span><span class="n">Process</span><span class="p">,</span> <span class="n">Resource</span><span class="p">,</span> <span class="n">activate</span><span class="p">,</span> <span class="n">initialize</span><span class="p">,</span>
<span class="n">hold</span><span class="p">,</span> <span class="n">now</span><span class="p">,</span> <span class="n">release</span><span class="p">,</span> <span class="n">request</span><span class="p">,</span> <span class="n">simulate</span><span class="p">)</span>
<span class="k">class</span> <span class="nc">Car</span><span class="p">(</span><span class="n">Process</span><span class="p">):</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="p">,</span> <span class="n">cc</span><span class="p">):</span>
<span class="n">Process</span><span class="o">.</span><span class="n">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="o">=</span><span class="n">name</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">cc</span> <span class="o">=</span> <span class="n">cc</span>
<span class="k">def</span> <span class="nf">go</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">print</span><span class="p">(</span><span class="s">'</span><span class="si">%s</span><span class="s"> </span><span class="si">%s</span><span class="s"> </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="p">(</span><span class="n">now</span><span class="p">(),</span> <span class="bp">self</span><span class="o">.</span><span class="n">name</span><span class="p">,</span> <span class="s">'Starting'</span><span class="p">))</span>
<span class="k">yield</span> <span class="n">request</span><span class="p">,</span> <span class="bp">self</span><span class="p">,</span> <span class="n">gasstation</span>
<span class="k">print</span><span class="p">(</span><span class="s">'</span><span class="si">%s</span><span class="s"> </span><span class="si">%s</span><span class="s"> </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="p">(</span><span class="n">now</span><span class="p">(),</span> <span class="bp">self</span><span class="o">.</span><span class="n">name</span><span class="p">,</span> <span class="s">'Got a pump'</span><span class="p">))</span>
<span class="k">yield</span> <span class="n">hold</span><span class="p">,</span> <span class="bp">self</span><span class="p">,</span> <span class="mf">100.0</span>
<span class="k">yield</span> <span class="n">release</span><span class="p">,</span> <span class="bp">self</span><span class="p">,</span> <span class="n">gasstation</span>
<span class="k">print</span><span class="p">(</span><span class="s">'</span><span class="si">%s</span><span class="s"> </span><span class="si">%s</span><span class="s"> </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="p">(</span><span class="n">now</span><span class="p">(),</span> <span class="bp">self</span><span class="o">.</span><span class="n">name</span><span class="p">,</span> <span class="s">'Leaving'</span><span class="p">))</span>
<span class="n">gasstation</span> <span class="o">=</span> <span class="n">Resource</span><span class="p">(</span><span class="n">capacity</span><span class="o">=</span><span class="mi">2</span><span class="p">,</span> <span class="n">name</span><span class="o">=</span><span class="s">'gasStation'</span><span class="p">,</span> <span class="n">unitName</span><span class="o">=</span><span class="s">'pump'</span><span class="p">)</span>
<span class="n">initialize</span><span class="p">()</span>
<span class="n">c1</span> <span class="o">=</span> <span class="n">Car</span><span class="p">(</span><span class="s">'Car1'</span><span class="p">,</span> <span class="mi">2000</span><span class="p">)</span>
<span class="n">c2</span> <span class="o">=</span> <span class="n">Car</span><span class="p">(</span><span class="s">'Car2'</span><span class="p">,</span> <span class="mi">1600</span><span class="p">)</span>
<span class="n">c3</span> <span class="o">=</span> <span class="n">Car</span><span class="p">(</span><span class="s">'Car3'</span><span class="p">,</span> <span class="mi">3000</span><span class="p">)</span>
<span class="n">c4</span> <span class="o">=</span> <span class="n">Car</span><span class="p">(</span><span class="s">'Car4'</span><span class="p">,</span> <span class="mi">1600</span><span class="p">)</span>
<span class="n">activate</span><span class="p">(</span><span class="n">c1</span><span class="p">,</span> <span class="n">c1</span><span class="o">.</span><span class="n">go</span><span class="p">(),</span> <span class="n">at</span><span class="o">=</span><span class="mf">4.0</span><span class="p">)</span> <span class="c"># activate at time 4.0</span>
<span class="n">activate</span><span class="p">(</span><span class="n">c2</span><span class="p">,</span> <span class="n">c2</span><span class="o">.</span><span class="n">go</span><span class="p">())</span> <span class="c"># activate at time 0.0</span>
<span class="n">activate</span><span class="p">(</span><span class="n">c3</span><span class="p">,</span> <span class="n">c3</span><span class="o">.</span><span class="n">go</span><span class="p">(),</span> <span class="n">at</span><span class="o">=</span><span class="mf">3.0</span><span class="p">)</span> <span class="c"># activate at time 3.0</span>
<span class="n">activate</span><span class="p">(</span><span class="n">c4</span><span class="p">,</span> <span class="n">c4</span><span class="o">.</span><span class="n">go</span><span class="p">(),</span> <span class="n">at</span><span class="o">=</span><span class="mf">3.0</span><span class="p">)</span> <span class="c"># activate at time 2.0</span>
<span class="n">simulate</span><span class="p">(</span><span class="n">until</span><span class="o">=</span><span class="mi">300</span><span class="p">)</span>
<span class="k">print</span><span class="p">(</span><span class="s">'Current time is </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="n">now</span><span class="p">())</span>
</pre></div>
</div>
<p>Output:</p>
<div class="highlight-python"><pre>0 activate <Car1> at time: 4.0 prior: False
0 activate <Car2> at time: 0 prior: False
0 activate <Car3> at time: 3.0 prior: False
0 activate <Car4> at time: 3.0 prior: False
0 Car2 Starting
0 request <Car2> <gasStation> priority: default
. . .waitQ: []
. . .activeQ: ['Car2']
0 Car2 Got a pump
0 hold <Car2> delay: 100.0
3.0 Car3 Starting
3.0 request <Car3> <gasStation> priority: default
. . .waitQ: []
. . .activeQ: ['Car2', 'Car3']
3.0 Car3 Got a pump
3.0 hold <Car3> delay: 100.0
3.0 Car4 Starting
3.0 request <Car4> <gasStation> priority: default
. . .waitQ: ['Car4']
. . .activeQ: ['Car2', 'Car3']
4.0 Car1 Starting
4.0 request <Car1> <gasStation> priority: default
. . .waitQ: ['Car4', 'Car1']
. . .activeQ: ['Car2', 'Car3']
100.0 reactivate <Car4> time: 100.0 prior: 1
100.0 release <Car2> <gasStation>
. . .waitQ: ['Car1']
. . .activeQ: ['Car3', 'Car4']
100.0 Car2 Leaving
100.0 <Car2> terminated
100.0 Car4 Got a pump
100.0 hold <Car4> delay: 100.0
103.0 reactivate <Car1> time: 103.0 prior: 1
103.0 release <Car3> <gasStation>
. . .waitQ: []
. . .activeQ: ['Car4', 'Car1']
103.0 Car3 Leaving
103.0 <Car3> terminated
103.0 Car1 Got a pump
103.0 hold <Car1> delay: 100.0
200.0 release <Car4> <gasStation>
. . .waitQ: []
. . .activeQ: ['Car1']
200.0 Car4 Leaving
200.0 <Car4> terminated
203.0 release <Car1> <gasStation>
. . .waitQ: []
. . .activeQ: []
203.0 Car1 Leaving
203.0 <Car1> terminated
Current time is 203.0
</pre>
</div>
</div>
<div class="section" id="carwash">
<h2>Carwash<a class="headerlink" href="#carwash" title="Permalink to this headline">¶</a></h2>
<div class="highlight-python" id="index-4"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">SimPy.Simulation</span> <span class="kn">import</span> <span class="p">(</span><span class="n">Process</span><span class="p">,</span> <span class="n">SimEvent</span><span class="p">,</span> <span class="n">Store</span><span class="p">,</span> <span class="n">activate</span><span class="p">,</span> <span class="n">get</span><span class="p">,</span>
<span class="n">initialize</span><span class="p">,</span> <span class="n">hold</span><span class="p">,</span> <span class="n">now</span><span class="p">,</span> <span class="n">put</span><span class="p">,</span> <span class="n">simulate</span><span class="p">,</span> <span class="n">waitevent</span><span class="p">)</span>
<span class="sd">"""Carwash is master"""</span>
<span class="k">class</span> <span class="nc">Carwash</span><span class="p">(</span><span class="n">Process</span><span class="p">):</span>
<span class="sd">"""Carwash is master"""</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="p">):</span>
<span class="n">Process</span><span class="o">.</span><span class="n">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="o">=</span><span class="n">name</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">lifecycle</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">while</span> <span class="bp">True</span><span class="p">:</span>
<span class="k">yield</span> <span class="n">get</span><span class="p">,</span> <span class="bp">self</span><span class="p">,</span> <span class="n">waitingCars</span><span class="p">,</span> <span class="mi">1</span>
<span class="n">carBeingWashed</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">got</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
<span class="k">yield</span> <span class="n">hold</span><span class="p">,</span> <span class="bp">self</span><span class="p">,</span> <span class="n">washtime</span>
<span class="n">carBeingWashed</span><span class="o">.</span><span class="n">doneSignal</span><span class="o">.</span><span class="n">signal</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">name</span><span class="p">)</span>
<span class="k">class</span> <span class="nc">Car</span><span class="p">(</span><span class="n">Process</span><span class="p">):</span>
<span class="sd">"""Car is slave"""</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="p">):</span>
<span class="n">Process</span><span class="o">.</span><span class="n">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="o">=</span><span class="n">name</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">doneSignal</span> <span class="o">=</span> <span class="n">SimEvent</span><span class="p">()</span>
<span class="k">def</span> <span class="nf">lifecycle</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">yield</span> <span class="n">put</span><span class="p">,</span> <span class="bp">self</span><span class="p">,</span> <span class="n">waitingCars</span><span class="p">,</span> <span class="p">[</span><span class="bp">self</span><span class="p">]</span>
<span class="k">yield</span> <span class="n">waitevent</span><span class="p">,</span> <span class="bp">self</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">doneSignal</span>
<span class="n">whichWash</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">doneSignal</span><span class="o">.</span><span class="n">signalparam</span>
<span class="k">print</span><span class="p">(</span><span class="s">'</span><span class="si">%s</span><span class="s"> car </span><span class="si">%s</span><span class="s"> done by </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="p">(</span><span class="n">now</span><span class="p">(),</span> <span class="bp">self</span><span class="o">.</span><span class="n">name</span><span class="p">,</span> <span class="n">whichWash</span><span class="p">))</span>
<span class="k">class</span> <span class="nc">CarGenerator</span><span class="p">(</span><span class="n">Process</span><span class="p">):</span>
<span class="k">def</span> <span class="nf">generate</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="n">i</span> <span class="o">=</span> <span class="mi">0</span>
<span class="k">while</span> <span class="bp">True</span><span class="p">:</span>
<span class="k">yield</span> <span class="n">hold</span><span class="p">,</span> <span class="bp">self</span><span class="p">,</span> <span class="mi">2</span>
<span class="n">c</span> <span class="o">=</span> <span class="n">Car</span><span class="p">(</span><span class="s">'</span><span class="si">%d</span><span class="s">'</span> <span class="o">%</span> <span class="n">i</span><span class="p">)</span>
<span class="n">activate</span><span class="p">(</span><span class="n">c</span><span class="p">,</span> <span class="n">c</span><span class="o">.</span><span class="n">lifecycle</span><span class="p">())</span>
<span class="n">i</span> <span class="o">+=</span> <span class="mi">1</span>
<span class="n">washtime</span> <span class="o">=</span> <span class="mi">5</span>
<span class="n">initialize</span><span class="p">()</span>
<span class="c"># put four cars into the queue of waiting cars</span>
<span class="k">for</span> <span class="n">j</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">5</span><span class="p">):</span>
<span class="n">c</span> <span class="o">=</span> <span class="n">Car</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s">'</span><span class="si">%d</span><span class="s">'</span> <span class="o">%</span> <span class="o">-</span><span class="n">j</span><span class="p">)</span>
<span class="n">activate</span><span class="p">(</span><span class="n">c</span><span class="p">,</span> <span class="n">c</span><span class="o">.</span><span class="n">lifecycle</span><span class="p">())</span>
<span class="n">waitingCars</span> <span class="o">=</span> <span class="n">Store</span><span class="p">(</span><span class="n">capacity</span><span class="o">=</span><span class="mi">40</span><span class="p">)</span>
<span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">2</span><span class="p">):</span>
<span class="n">cw</span> <span class="o">=</span> <span class="n">Carwash</span><span class="p">(</span><span class="s">'Carwash </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="n">i</span><span class="p">)</span>
<span class="n">activate</span><span class="p">(</span><span class="n">cw</span><span class="p">,</span> <span class="n">cw</span><span class="o">.</span><span class="n">lifecycle</span><span class="p">())</span>
<span class="n">cg</span> <span class="o">=</span> <span class="n">CarGenerator</span><span class="p">()</span>
<span class="n">activate</span><span class="p">(</span><span class="n">cg</span><span class="p">,</span> <span class="n">cg</span><span class="o">.</span><span class="n">generate</span><span class="p">())</span>
<span class="n">simulate</span><span class="p">(</span><span class="n">until</span><span class="o">=</span><span class="mi">30</span><span class="p">)</span>
<span class="k">print</span><span class="p">(</span><span class="s">'waitingCars </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="p">[</span><span class="n">x</span><span class="o">.</span><span class="n">name</span> <span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="n">waitingCars</span><span class="o">.</span><span class="n">theBuffer</span><span class="p">])</span>
</pre></div>
</div>
<p>Output:</p>
<div class="highlight-python"><pre>5 car -1 done by Carwash 0
5 car -2 done by Carwash 1
10 car -3 done by Carwash 0
10 car -4 done by Carwash 1
15 car 0 done by Carwash 0
15 car 1 done by Carwash 1
20 car 2 done by Carwash 0
20 car 3 done by Carwash 1
25 car 4 done by Carwash 0
25 car 5 done by Carwash 1
30 car 6 done by Carwash 0
30 car 7 done by Carwash 1
waitingCars ['10', '11', '12', '13', '14']
</pre>
</div>
</div>
<div class="section" id="breakdown">
<h2>Breakdown<a class="headerlink" href="#breakdown" title="Permalink to this headline">¶</a></h2>
<div class="highlight-python" id="index-5"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">SimPy.Simulation</span> <span class="kn">import</span> <span class="p">(</span><span class="n">Process</span><span class="p">,</span> <span class="n">activate</span><span class="p">,</span> <span class="n">hold</span><span class="p">,</span> <span class="n">initialize</span><span class="p">,</span> <span class="n">now</span><span class="p">,</span>
<span class="n">reactivate</span><span class="p">,</span> <span class="n">simulate</span><span class="p">)</span>
<span class="k">class</span> <span class="nc">Bus</span><span class="p">(</span><span class="n">Process</span><span class="p">):</span>
<span class="k">def</span> <span class="nf">operate</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">repairduration</span><span class="p">,</span> <span class="n">triplength</span><span class="p">):</span> <span class="c"># PEM</span>
<span class="n">tripleft</span> <span class="o">=</span> <span class="n">triplength</span> <span class="c"># time needed to finish trip</span>
<span class="k">while</span> <span class="n">tripleft</span> <span class="o">></span> <span class="mi">0</span><span class="p">:</span>
<span class="k">yield</span> <span class="n">hold</span><span class="p">,</span> <span class="bp">self</span><span class="p">,</span> <span class="n">tripleft</span> <span class="c"># try to finish the trip</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">interrupted</span><span class="p">():</span> <span class="c"># if another breakdown occurs</span>
<span class="k">print</span><span class="p">(</span><span class="s">'</span><span class="si">%s</span><span class="s"> at </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">interruptCause</span><span class="o">.</span><span class="n">name</span><span class="p">,</span> <span class="n">now</span><span class="p">()))</span>
<span class="n">tripleft</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">interruptLeft</span> <span class="c"># time to finish the trip</span>
<span class="bp">self</span><span class="o">.</span><span class="n">interruptReset</span><span class="p">()</span> <span class="c"># end interrupt state</span>
<span class="n">reactivate</span><span class="p">(</span><span class="n">br</span><span class="p">,</span> <span class="n">delay</span><span class="o">=</span><span class="n">repairduration</span><span class="p">)</span> <span class="c"># restart breakdown br</span>
<span class="k">yield</span> <span class="n">hold</span><span class="p">,</span> <span class="bp">self</span><span class="p">,</span> <span class="n">repairduration</span> <span class="c"># delay for repairs</span>
<span class="k">print</span><span class="p">(</span><span class="s">'Bus repaired at </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="n">now</span><span class="p">())</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">break</span> <span class="c"># no more breakdowns, bus finished trip</span>
<span class="k">print</span><span class="p">(</span><span class="s">'Bus has arrived at </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="n">now</span><span class="p">())</span>
<span class="k">class</span> <span class="nc">Breakdown</span><span class="p">(</span><span class="n">Process</span><span class="p">):</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">myBus</span><span class="p">):</span>
<span class="n">Process</span><span class="o">.</span><span class="n">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="o">=</span><span class="s">'Breakdown '</span> <span class="o">+</span> <span class="n">myBus</span><span class="o">.</span><span class="n">name</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">bus</span> <span class="o">=</span> <span class="n">myBus</span>
<span class="k">def</span> <span class="nf">breakBus</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">interval</span><span class="p">):</span> <span class="c"># process execution method</span>
<span class="k">while</span> <span class="bp">True</span><span class="p">:</span>
<span class="k">yield</span> <span class="n">hold</span><span class="p">,</span> <span class="bp">self</span><span class="p">,</span> <span class="n">interval</span> <span class="c"># breakdown interarrivals</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">bus</span><span class="o">.</span><span class="n">terminated</span><span class="p">():</span>
<span class="k">break</span>
<span class="bp">self</span><span class="o">.</span><span class="n">interrupt</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">bus</span><span class="p">)</span> <span class="c"># breakdown to myBus</span>
<span class="n">initialize</span><span class="p">()</span>
<span class="n">b</span> <span class="o">=</span> <span class="n">Bus</span><span class="p">(</span><span class="s">'Bus'</span><span class="p">)</span> <span class="c"># create a bus object</span>
<span class="n">activate</span><span class="p">(</span><span class="n">b</span><span class="p">,</span> <span class="n">b</span><span class="o">.</span><span class="n">operate</span><span class="p">(</span><span class="n">repairduration</span><span class="o">=</span><span class="mi">20</span><span class="p">,</span> <span class="n">triplength</span><span class="o">=</span><span class="mi">1000</span><span class="p">))</span>
<span class="n">br</span> <span class="o">=</span> <span class="n">Breakdown</span><span class="p">(</span><span class="n">b</span><span class="p">)</span> <span class="c"># create breakdown br to bus b</span>
<span class="n">activate</span><span class="p">(</span><span class="n">br</span><span class="p">,</span> <span class="n">br</span><span class="o">.</span><span class="n">breakBus</span><span class="p">(</span><span class="mi">300</span><span class="p">))</span>
<span class="n">simulate</span><span class="p">(</span><span class="n">until</span><span class="o">=</span><span class="mi">4000</span><span class="p">)</span>
<span class="k">print</span><span class="p">(</span><span class="s">'SimPy: No more events at time </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="n">now</span><span class="p">())</span>
</pre></div>
</div>
<p>Output:</p>
<div class="highlight-python"><pre>Breakdown Bus at 300
Bus repaired at 320
Breakdown Bus at 620
Bus repaired at 640
Breakdown Bus at 940
Bus repaired at 960
Bus has arrived at 1060
SimPy: No more events at time 1260
</pre>
</div>
</div>
<div class="section" id="firework">
<h2>Firework<a class="headerlink" href="#firework" title="Permalink to this headline">¶</a></h2>
<div class="highlight-python" id="index-6"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">SimPy.Simulation</span> <span class="kn">import</span> <span class="n">Process</span><span class="p">,</span> <span class="n">activate</span><span class="p">,</span> <span class="n">initialize</span><span class="p">,</span> <span class="n">hold</span><span class="p">,</span> <span class="n">now</span><span class="p">,</span> <span class="n">simulate</span>
<span class="k">class</span> <span class="nc">Firework</span><span class="p">(</span><span class="n">Process</span><span class="p">):</span>
<span class="k">def</span> <span class="nf">execute</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">print</span><span class="p">(</span><span class="s">'</span><span class="si">%s</span><span class="s"> firework launched'</span> <span class="o">%</span> <span class="n">now</span><span class="p">())</span>
<span class="k">yield</span> <span class="n">hold</span><span class="p">,</span> <span class="bp">self</span><span class="p">,</span> <span class="mf">10.0</span> <span class="c"># wait 10.0 time units</span>
<span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">10</span><span class="p">):</span>
<span class="k">yield</span> <span class="n">hold</span><span class="p">,</span> <span class="bp">self</span><span class="p">,</span> <span class="mf">1.0</span>
<span class="k">print</span><span class="p">(</span><span class="s">'</span><span class="si">%s</span><span class="s"> tick'</span> <span class="o">%</span> <span class="n">now</span><span class="p">())</span>
<span class="k">yield</span> <span class="n">hold</span><span class="p">,</span> <span class="bp">self</span><span class="p">,</span> <span class="mf">10.0</span> <span class="c"># wait another 10.0 time units</span>
<span class="k">print</span><span class="p">(</span><span class="s">'</span><span class="si">%s</span><span class="s"> Boom!!'</span> <span class="o">%</span> <span class="n">now</span><span class="p">())</span>
<span class="n">initialize</span><span class="p">()</span>
<span class="n">f</span> <span class="o">=</span> <span class="n">Firework</span><span class="p">()</span> <span class="c"># create a Firework object, and</span>
<span class="c"># activate it (with some default parameters)</span>
<span class="n">activate</span><span class="p">(</span><span class="n">f</span><span class="p">,</span> <span class="n">f</span><span class="o">.</span><span class="n">execute</span><span class="p">(),</span> <span class="n">at</span><span class="o">=</span><span class="mf">0.0</span><span class="p">)</span>
<span class="n">simulate</span><span class="p">(</span><span class="n">until</span><span class="o">=</span><span class="mi">100</span><span class="p">)</span>
</pre></div>
</div>
<p>Output:</p>
<div class="highlight-python"><pre>0 firework launched
11.0 tick
12.0 tick
13.0 tick
14.0 tick
15.0 tick
16.0 tick
17.0 tick
18.0 tick
19.0 tick
20.0 tick
30.0 Boom!!
</pre>
</div>
</div>
<div class="section" id="levelinventory">
<h2>Levelinventory<a class="headerlink" href="#levelinventory" title="Permalink to this headline">¶</a></h2>
<div class="highlight-python" id="index-7"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">random</span> <span class="kn">import</span> <span class="n">normalvariate</span><span class="p">,</span> <span class="n">seed</span>
<span class="kn">from</span> <span class="nn">SimPy.Simulation</span> <span class="kn">import</span> <span class="p">(</span><span class="n">Level</span><span class="p">,</span> <span class="n">Process</span><span class="p">,</span> <span class="n">activate</span><span class="p">,</span> <span class="n">get</span><span class="p">,</span> <span class="n">initialize</span><span class="p">,</span> <span class="n">hold</span><span class="p">,</span>
<span class="n">now</span><span class="p">,</span> <span class="n">put</span><span class="p">,</span> <span class="n">simulate</span><span class="p">)</span>
<span class="k">class</span> <span class="nc">Deliver</span><span class="p">(</span><span class="n">Process</span><span class="p">):</span>
<span class="k">def</span> <span class="nf">deliver</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="c"># an "offeror" PEM</span>
<span class="k">while</span> <span class="bp">True</span><span class="p">:</span>
<span class="n">lead</span> <span class="o">=</span> <span class="mf">10.0</span> <span class="c"># time between refills</span>
<span class="n">delivery</span> <span class="o">=</span> <span class="mf">10.0</span> <span class="c"># amount in each refill</span>
<span class="k">yield</span> <span class="n">put</span><span class="p">,</span> <span class="bp">self</span><span class="p">,</span> <span class="n">stock</span><span class="p">,</span> <span class="n">delivery</span>
<span class="k">print</span><span class="p">(</span><span class="s">'at </span><span class="si">%6.4f</span><span class="s">, add </span><span class="si">%6.4f</span><span class="s"> units, now amount = </span><span class="si">%6.4f</span><span class="s">'</span> <span class="o">%</span>
<span class="p">(</span><span class="n">now</span><span class="p">(),</span> <span class="n">delivery</span><span class="p">,</span> <span class="n">stock</span><span class="o">.</span><span class="n">amount</span><span class="p">))</span>
<span class="k">yield</span> <span class="n">hold</span><span class="p">,</span> <span class="bp">self</span><span class="p">,</span> <span class="n">lead</span>
<span class="k">class</span> <span class="nc">Demand</span><span class="p">(</span><span class="n">Process</span><span class="p">):</span>
<span class="n">stockout</span> <span class="o">=</span> <span class="mf">0.0</span> <span class="c"># initialize initial stockout amount</span>
<span class="k">def</span> <span class="nf">demand</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="c"># a "requester" PEM</span>
<span class="n">day</span> <span class="o">=</span> <span class="mf">1.0</span> <span class="c"># set time-step to one day</span>
<span class="k">while</span> <span class="bp">True</span><span class="p">:</span>
<span class="k">yield</span> <span class="n">hold</span><span class="p">,</span> <span class="bp">self</span><span class="p">,</span> <span class="n">day</span>
<span class="n">dd</span> <span class="o">=</span> <span class="n">normalvariate</span><span class="p">(</span><span class="mf">1.20</span><span class="p">,</span> <span class="mf">0.20</span><span class="p">)</span> <span class="c"># today's random demand</span>
<span class="n">ds</span> <span class="o">=</span> <span class="n">dd</span> <span class="o">-</span> <span class="n">stock</span><span class="o">.</span><span class="n">amount</span>
<span class="c"># excess of demand over current stock amount</span>
<span class="k">if</span> <span class="n">dd</span> <span class="o">></span> <span class="n">stock</span><span class="o">.</span><span class="n">amount</span><span class="p">:</span> <span class="c"># can't supply requested amount</span>
<span class="k">yield</span> <span class="n">get</span><span class="p">,</span> <span class="bp">self</span><span class="p">,</span> <span class="n">stock</span><span class="p">,</span> <span class="n">stock</span><span class="o">.</span><span class="n">amount</span>
<span class="c"># supply all available amount</span>
<span class="bp">self</span><span class="o">.</span><span class="n">stockout</span> <span class="o">+=</span> <span class="n">ds</span>
<span class="c"># add unsupplied demand to self.stockout</span>
<span class="k">print</span><span class="p">(</span><span class="s">'day </span><span class="si">%6.4f</span><span class="s">, demand = </span><span class="si">%6.4f</span><span class="s">, shortfall = </span><span class="si">%6.4f</span><span class="s">'</span> <span class="o">%</span>
<span class="p">(</span><span class="n">now</span><span class="p">(),</span> <span class="n">dd</span><span class="p">,</span> <span class="o">-</span><span class="n">ds</span><span class="p">))</span>
<span class="k">else</span><span class="p">:</span> <span class="c"># can supply requested amount</span>
<span class="k">yield</span> <span class="n">get</span><span class="p">,</span> <span class="bp">self</span><span class="p">,</span> <span class="n">stock</span><span class="p">,</span> <span class="n">dd</span>
<span class="k">print</span><span class="p">(</span><span class="s">'day </span><span class="si">%6.4f</span><span class="s">, supplied </span><span class="si">%6.4f</span><span class="s">, now amount = </span><span class="si">%6.4f</span><span class="s">'</span> <span class="o">%</span>
<span class="p">(</span><span class="n">now</span><span class="p">(),</span> <span class="n">dd</span><span class="p">,</span> <span class="n">stock</span><span class="o">.</span><span class="n">amount</span><span class="p">))</span>
<span class="n">stock</span> <span class="o">=</span> <span class="n">Level</span><span class="p">(</span><span class="n">monitored</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span> <span class="c"># 'unbounded' capacity and other defaults</span>
<span class="n">seed</span><span class="p">(</span><span class="mi">99999</span><span class="p">)</span>
<span class="n">initialize</span><span class="p">()</span>
<span class="n">offeror</span> <span class="o">=</span> <span class="n">Deliver</span><span class="p">()</span>
<span class="n">activate</span><span class="p">(</span><span class="n">offeror</span><span class="p">,</span> <span class="n">offeror</span><span class="o">.</span><span class="n">deliver</span><span class="p">())</span>
<span class="n">requester</span> <span class="o">=</span> <span class="n">Demand</span><span class="p">()</span>
<span class="n">activate</span><span class="p">(</span><span class="n">requester</span><span class="p">,</span> <span class="n">requester</span><span class="o">.</span><span class="n">demand</span><span class="p">())</span>
<span class="n">simulate</span><span class="p">(</span><span class="n">until</span><span class="o">=</span><span class="mf">49.9</span><span class="p">)</span>
<span class="n">result</span> <span class="o">=</span> <span class="p">(</span><span class="n">stock</span><span class="o">.</span><span class="n">bufferMon</span><span class="o">.</span><span class="n">mean</span><span class="p">(),</span> <span class="n">requester</span><span class="o">.</span><span class="n">stockout</span><span class="p">)</span>
<span class="k">print</span><span class="p">(</span><span class="s">''</span><span class="p">)</span>
<span class="k">print</span><span class="p">(</span><span class="s">'Summary of results through end of day </span><span class="si">%6.4f</span><span class="s">:'</span> <span class="o">%</span> <span class="nb">int</span><span class="p">(</span><span class="n">now</span><span class="p">()))</span>
<span class="k">print</span><span class="p">(</span><span class="s">'average stock = </span><span class="si">%6.4f</span><span class="s">, cumulative stockout = </span><span class="si">%6.4f</span><span class="s">'</span> <span class="o">%</span> <span class="n">result</span><span class="p">)</span>
</pre></div>
</div>
<p>Output:</p>
<div class="highlight-python"><pre>at 0.0000, add 10.0000 units, now amount = 10.0000
day 1.0000, supplied 1.0115, now amount = 8.9885
day 2.0000, supplied 1.1377, now amount = 7.8508
day 3.0000, supplied 0.7743, now amount = 7.0766
day 4.0000, supplied 1.4056, now amount = 5.6709
day 5.0000, supplied 0.9736, now amount = 4.6973
day 6.0000, supplied 1.1061, now amount = 3.5912
day 7.0000, supplied 1.4067, now amount = 2.1845
day 8.0000, supplied 1.2884, now amount = 0.8961
day 9.0000, demand = 1.4426, shortfall = -0.5465
at 10.0000, add 10.0000 units, now amount = 10.0000
day 10.0000, supplied 1.5850, now amount = 8.4150
day 11.0000, supplied 0.7974, now amount = 7.6176
day 12.0000, supplied 0.8854, now amount = 6.7323
day 13.0000, supplied 1.4893, now amount = 5.2430
day 14.0000, supplied 1.0522, now amount = 4.1908
day 15.0000, supplied 1.0492, now amount = 3.1416
day 16.0000, supplied 1.2013, now amount = 1.9403
day 17.0000, supplied 1.4026, now amount = 0.5377
day 18.0000, demand = 1.0874, shortfall = -0.5497
day 19.0000, demand = 1.3043, shortfall = -1.3043
at 20.0000, add 10.0000 units, now amount = 10.0000
day 20.0000, supplied 1.2737, now amount = 8.7263
day 21.0000, supplied 0.9550, now amount = 7.7713
day 22.0000, supplied 1.3646, now amount = 6.4067
day 23.0000, supplied 0.8629, now amount = 5.5438
day 24.0000, supplied 1.2893, now amount = 4.2545
day 25.0000, supplied 1.1897, now amount = 3.0648
day 26.0000, supplied 0.9708, now amount = 2.0940
day 27.0000, supplied 1.1397, now amount = 0.9543
day 28.0000, demand = 1.1286, shortfall = -0.1743
day 29.0000, demand = 0.8891, shortfall = -0.8891
at 30.0000, add 10.0000 units, now amount = 10.0000
day 30.0000, supplied 0.9496, now amount = 9.0504
day 31.0000, supplied 1.1515, now amount = 7.8988
day 32.0000, supplied 1.3724, now amount = 6.5264
day 33.0000, supplied 0.6977, now amount = 5.8287
day 34.0000, supplied 1.2291, now amount = 4.5996
day 35.0000, supplied 1.3502, now amount = 3.2494
day 36.0000, supplied 1.0396, now amount = 2.2098
day 37.0000, supplied 1.3442, now amount = 0.8656
day 38.0000, demand = 1.0919, shortfall = -0.2263
day 39.0000, demand = 1.4077, shortfall = -1.4077
at 40.0000, add 10.0000 units, now amount = 10.0000
day 40.0000, supplied 0.9053, now amount = 9.0947
day 41.0000, supplied 1.2982, now amount = 7.7965
day 42.0000, supplied 1.3458, now amount = 6.4508
day 43.0000, supplied 1.2357, now amount = 5.2151
day 44.0000, supplied 1.2822, now amount = 3.9329
day 45.0000, supplied 1.1809, now amount = 2.7519
day 46.0000, supplied 1.0891, now amount = 1.6629
day 47.0000, supplied 1.1926, now amount = 0.4702
day 48.0000, demand = 1.3927, shortfall = -0.9224
day 49.0000, demand = 1.2690, shortfall = -1.2690
Summary of results through end of day 49.0000:
average stock = 4.4581, cumulative stockout = 7.2894
</pre>
</div>
</div>
<div class="section" id="message">
<h2>Message<a class="headerlink" href="#message" title="Permalink to this headline">¶</a></h2>
<div class="highlight-python" id="index-8"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">SimPy.Simulation</span> <span class="kn">import</span> <span class="n">Process</span><span class="p">,</span> <span class="n">activate</span><span class="p">,</span> <span class="n">initialize</span><span class="p">,</span> <span class="n">hold</span><span class="p">,</span> <span class="n">now</span><span class="p">,</span> <span class="n">simulate</span>
<span class="k">class</span> <span class="nc">Message</span><span class="p">(</span><span class="n">Process</span><span class="p">):</span>
<span class="sd">"""A simple Process"""</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">i</span><span class="p">,</span> <span class="nb">len</span><span class="p">):</span>
<span class="n">Process</span><span class="o">.</span><span class="n">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="o">=</span><span class="s">'Message'</span> <span class="o">+</span> <span class="nb">str</span><span class="p">(</span><span class="n">i</span><span class="p">))</span>
<span class="bp">self</span><span class="o">.</span><span class="n">i</span> <span class="o">=</span> <span class="n">i</span>
<span class="bp">self</span><span class="o">.</span><span class="n">len</span> <span class="o">=</span> <span class="nb">len</span>
<span class="k">def</span> <span class="nf">go</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">print</span><span class="p">(</span><span class="s">'</span><span class="si">%s</span><span class="s"> </span><span class="si">%s</span><span class="s"> </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="p">(</span><span class="n">now</span><span class="p">(),</span> <span class="bp">self</span><span class="o">.</span><span class="n">i</span><span class="p">,</span> <span class="s">'Starting'</span><span class="p">))</span>
<span class="k">yield</span> <span class="n">hold</span><span class="p">,</span> <span class="bp">self</span><span class="p">,</span> <span class="mf">100.0</span>
<span class="k">print</span><span class="p">(</span><span class="s">'</span><span class="si">%s</span><span class="s"> </span><span class="si">%s</span><span class="s"> </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="p">(</span><span class="n">now</span><span class="p">(),</span> <span class="bp">self</span><span class="o">.</span><span class="n">i</span><span class="p">,</span> <span class="s">'Arrived'</span><span class="p">))</span>
<span class="n">initialize</span><span class="p">()</span>
<span class="n">p1</span> <span class="o">=</span> <span class="n">Message</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">203</span><span class="p">)</span> <span class="c"># new message</span>
<span class="n">activate</span><span class="p">(</span><span class="n">p1</span><span class="p">,</span> <span class="n">p1</span><span class="o">.</span><span class="n">go</span><span class="p">())</span> <span class="c"># activate it</span>
<span class="n">p2</span> <span class="o">=</span> <span class="n">Message</span><span class="p">(</span><span class="mi">2</span><span class="p">,</span> <span class="mi">33</span><span class="p">)</span>
<span class="n">activate</span><span class="p">(</span><span class="n">p2</span><span class="p">,</span> <span class="n">p2</span><span class="o">.</span><span class="n">go</span><span class="p">(),</span> <span class="n">at</span><span class="o">=</span><span class="mf">6.0</span><span class="p">)</span>
<span class="n">simulate</span><span class="p">(</span><span class="n">until</span><span class="o">=</span><span class="mi">200</span><span class="p">)</span>
<span class="k">print</span><span class="p">(</span><span class="s">'Current time is </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="n">now</span><span class="p">())</span> <span class="c"># will print 106.0</span>
</pre></div>
</div>
<p>Output:</p>
<div class="highlight-python"><pre>0 1 Starting
6.0 2 Starting
100.0 1 Arrived
106.0 2 Arrived
Current time is 106.0
</pre>
</div>
</div>
<div class="section" id="resource">
<h2>Resource<a class="headerlink" href="#resource" title="Permalink to this headline">¶</a></h2>
<div class="highlight-python" id="index-9"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">SimPy.Simulation</span> <span class="kn">import</span> <span class="p">(</span><span class="n">Process</span><span class="p">,</span> <span class="n">Resource</span><span class="p">,</span> <span class="n">activate</span><span class="p">,</span> <span class="n">initialize</span><span class="p">,</span> <span class="n">hold</span><span class="p">,</span>
<span class="n">now</span><span class="p">,</span> <span class="n">release</span><span class="p">,</span> <span class="n">request</span><span class="p">,</span> <span class="n">simulate</span><span class="p">)</span>
<span class="k">class</span> <span class="nc">Client</span><span class="p">(</span><span class="n">Process</span><span class="p">):</span>
<span class="n">inClients</span> <span class="o">=</span> <span class="p">[]</span> <span class="c"># list the clients in order by their requests</span>
<span class="n">outClients</span> <span class="o">=</span> <span class="p">[]</span> <span class="c"># list the clients in order by completion of service</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="p">):</span>
<span class="n">Process</span><span class="o">.</span><span class="n">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">getserved</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">servtime</span><span class="p">,</span> <span class="n">priority</span><span class="p">,</span> <span class="n">myServer</span><span class="p">):</span>
<span class="n">Client</span><span class="o">.</span><span class="n">inClients</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">name</span><span class="p">)</span>
<span class="k">print</span><span class="p">(</span><span class="s">'</span><span class="si">%s</span><span class="s"> requests 1 unit at t = </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">name</span><span class="p">,</span> <span class="n">now</span><span class="p">()))</span>
<span class="c"># request use of a resource unit</span>
<span class="k">yield</span> <span class="n">request</span><span class="p">,</span> <span class="bp">self</span><span class="p">,</span> <span class="n">myServer</span><span class="p">,</span> <span class="n">priority</span>
<span class="k">yield</span> <span class="n">hold</span><span class="p">,</span> <span class="bp">self</span><span class="p">,</span> <span class="n">servtime</span>
<span class="c"># release the resource</span>
<span class="k">yield</span> <span class="n">release</span><span class="p">,</span> <span class="bp">self</span><span class="p">,</span> <span class="n">myServer</span>
<span class="k">print</span><span class="p">(</span><span class="s">'</span><span class="si">%s</span><span class="s"> done at t = </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">name</span><span class="p">,</span> <span class="n">now</span><span class="p">()))</span>
<span class="n">Client</span><span class="o">.</span><span class="n">outClients</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">name</span><span class="p">)</span>
<span class="n">initialize</span><span class="p">()</span>
<span class="c"># the next line creates the ``server`` Resource object</span>
<span class="n">server</span> <span class="o">=</span> <span class="n">Resource</span><span class="p">(</span><span class="n">capacity</span><span class="o">=</span><span class="mi">2</span><span class="p">)</span> <span class="c"># server defaults to qType==FIFO</span>
<span class="c"># the next lines create some Client process objects</span>
<span class="n">c1</span><span class="p">,</span> <span class="n">c2</span> <span class="o">=</span> <span class="n">Client</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s">'c1'</span><span class="p">),</span> <span class="n">Client</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s">'c2'</span><span class="p">)</span>
<span class="n">c3</span><span class="p">,</span> <span class="n">c4</span> <span class="o">=</span> <span class="n">Client</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s">'c3'</span><span class="p">),</span> <span class="n">Client</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s">'c4'</span><span class="p">)</span>
<span class="n">c5</span><span class="p">,</span> <span class="n">c6</span> <span class="o">=</span> <span class="n">Client</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s">'c5'</span><span class="p">),</span> <span class="n">Client</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s">'c6'</span><span class="p">)</span>
<span class="c"># in the next lines each client requests</span>
<span class="c"># one of the ``server``'s Resource units</span>
<span class="n">activate</span><span class="p">(</span><span class="n">c1</span><span class="p">,</span> <span class="n">c1</span><span class="o">.</span><span class="n">getserved</span><span class="p">(</span><span class="n">servtime</span><span class="o">=</span><span class="mi">100</span><span class="p">,</span> <span class="n">priority</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span> <span class="n">myServer</span><span class="o">=</span><span class="n">server</span><span class="p">))</span>
<span class="n">activate</span><span class="p">(</span><span class="n">c2</span><span class="p">,</span> <span class="n">c2</span><span class="o">.</span><span class="n">getserved</span><span class="p">(</span><span class="n">servtime</span><span class="o">=</span><span class="mi">100</span><span class="p">,</span> <span class="n">priority</span><span class="o">=</span><span class="mi">2</span><span class="p">,</span> <span class="n">myServer</span><span class="o">=</span><span class="n">server</span><span class="p">))</span>
<span class="n">activate</span><span class="p">(</span><span class="n">c3</span><span class="p">,</span> <span class="n">c3</span><span class="o">.</span><span class="n">getserved</span><span class="p">(</span><span class="n">servtime</span><span class="o">=</span><span class="mi">100</span><span class="p">,</span> <span class="n">priority</span><span class="o">=</span><span class="mi">3</span><span class="p">,</span> <span class="n">myServer</span><span class="o">=</span><span class="n">server</span><span class="p">))</span>
<span class="n">activate</span><span class="p">(</span><span class="n">c4</span><span class="p">,</span> <span class="n">c4</span><span class="o">.</span><span class="n">getserved</span><span class="p">(</span><span class="n">servtime</span><span class="o">=</span><span class="mi">100</span><span class="p">,</span> <span class="n">priority</span><span class="o">=</span><span class="mi">4</span><span class="p">,</span> <span class="n">myServer</span><span class="o">=</span><span class="n">server</span><span class="p">))</span>
<span class="n">activate</span><span class="p">(</span><span class="n">c5</span><span class="p">,</span> <span class="n">c5</span><span class="o">.</span><span class="n">getserved</span><span class="p">(</span><span class="n">servtime</span><span class="o">=</span><span class="mi">100</span><span class="p">,</span> <span class="n">priority</span><span class="o">=</span><span class="mi">5</span><span class="p">,</span> <span class="n">myServer</span><span class="o">=</span><span class="n">server</span><span class="p">))</span>
<span class="n">activate</span><span class="p">(</span><span class="n">c6</span><span class="p">,</span> <span class="n">c6</span><span class="o">.</span><span class="n">getserved</span><span class="p">(</span><span class="n">servtime</span><span class="o">=</span><span class="mi">100</span><span class="p">,</span> <span class="n">priority</span><span class="o">=</span><span class="mi">6</span><span class="p">,</span> <span class="n">myServer</span><span class="o">=</span><span class="n">server</span><span class="p">))</span>
<span class="n">simulate</span><span class="p">(</span><span class="n">until</span><span class="o">=</span><span class="mi">500</span><span class="p">)</span>
<span class="k">print</span><span class="p">(</span><span class="s">'Request order: </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="n">Client</span><span class="o">.</span><span class="n">inClients</span><span class="p">)</span>
<span class="k">print</span><span class="p">(</span><span class="s">'Service order: </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="n">Client</span><span class="o">.</span><span class="n">outClients</span><span class="p">)</span>
</pre></div>
</div>
<p>Output:</p>
<div class="highlight-python"><pre>c1 requests 1 unit at t = 0
c2 requests 1 unit at t = 0
c3 requests 1 unit at t = 0
c4 requests 1 unit at t = 0
c5 requests 1 unit at t = 0
c6 requests 1 unit at t = 0
c1 done at t = 100
c2 done at t = 100
c3 done at t = 200
c4 done at t = 200
c5 done at t = 300
c6 done at t = 300
Request order: ['c1', 'c2', 'c3', 'c4', 'c5', 'c6']
Service order: ['c1', 'c2', 'c3', 'c4', 'c5', 'c6']
</pre>
</div>
</div>
<div class="section" id="resource-monitor">
<h2>Resource monitor<a class="headerlink" href="#resource-monitor" title="Permalink to this headline">¶</a></h2>
<div class="highlight-python" id="index-10"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">math</span> <span class="kn">import</span> <span class="n">sqrt</span>
<span class="kn">from</span> <span class="nn">SimPy.Simulation</span> <span class="kn">import</span> <span class="p">(</span><span class="n">Monitor</span><span class="p">,</span> <span class="n">Process</span><span class="p">,</span> <span class="n">Resource</span><span class="p">,</span> <span class="n">activate</span><span class="p">,</span> <span class="n">initialize</span><span class="p">,</span>
<span class="n">hold</span><span class="p">,</span> <span class="n">now</span><span class="p">,</span> <span class="n">release</span><span class="p">,</span> <span class="n">request</span><span class="p">,</span> <span class="n">simulate</span><span class="p">)</span>
<span class="k">class</span> <span class="nc">Client</span><span class="p">(</span><span class="n">Process</span><span class="p">):</span>
<span class="n">inClients</span> <span class="o">=</span> <span class="p">[]</span>
<span class="n">outClients</span> <span class="o">=</span> <span class="p">[]</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="p">):</span>
<span class="n">Process</span><span class="o">.</span><span class="n">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">getserved</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">servtime</span><span class="p">,</span> <span class="n">myServer</span><span class="p">):</span>
<span class="k">print</span><span class="p">(</span><span class="s">'</span><span class="si">%s</span><span class="s"> requests 1 unit at t = </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">name</span><span class="p">,</span> <span class="n">now</span><span class="p">()))</span>
<span class="k">yield</span> <span class="n">request</span><span class="p">,</span> <span class="bp">self</span><span class="p">,</span> <span class="n">myServer</span>
<span class="k">yield</span> <span class="n">hold</span><span class="p">,</span> <span class="bp">self</span><span class="p">,</span> <span class="n">servtime</span>
<span class="k">yield</span> <span class="n">release</span><span class="p">,</span> <span class="bp">self</span><span class="p">,</span> <span class="n">myServer</span>
<span class="k">print</span><span class="p">(</span><span class="s">'</span><span class="si">%s</span><span class="s"> done at t = </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">name</span><span class="p">,</span> <span class="n">now</span><span class="p">()))</span>
<span class="n">initialize</span><span class="p">()</span>
<span class="n">server</span> <span class="o">=</span> <span class="n">Resource</span><span class="p">(</span><span class="n">capacity</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span> <span class="n">monitored</span><span class="o">=</span><span class="bp">True</span><span class="p">,</span> <span class="n">monitorType</span><span class="o">=</span><span class="n">Monitor</span><span class="p">)</span>
<span class="n">c1</span><span class="p">,</span> <span class="n">c2</span> <span class="o">=</span> <span class="n">Client</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s">'c1'</span><span class="p">),</span> <span class="n">Client</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s">'c2'</span><span class="p">)</span>
<span class="n">c3</span><span class="p">,</span> <span class="n">c4</span> <span class="o">=</span> <span class="n">Client</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s">'c3'</span><span class="p">),</span> <span class="n">Client</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s">'c4'</span><span class="p">)</span>
<span class="n">activate</span><span class="p">(</span><span class="n">c1</span><span class="p">,</span> <span class="n">c1</span><span class="o">.</span><span class="n">getserved</span><span class="p">(</span><span class="n">servtime</span><span class="o">=</span><span class="mi">100</span><span class="p">,</span> <span class="n">myServer</span><span class="o">=</span><span class="n">server</span><span class="p">))</span>
<span class="n">activate</span><span class="p">(</span><span class="n">c2</span><span class="p">,</span> <span class="n">c2</span><span class="o">.</span><span class="n">getserved</span><span class="p">(</span><span class="n">servtime</span><span class="o">=</span><span class="mi">100</span><span class="p">,</span> <span class="n">myServer</span><span class="o">=</span><span class="n">server</span><span class="p">))</span>
<span class="n">activate</span><span class="p">(</span><span class="n">c3</span><span class="p">,</span> <span class="n">c3</span><span class="o">.</span><span class="n">getserved</span><span class="p">(</span><span class="n">servtime</span><span class="o">=</span><span class="mi">100</span><span class="p">,</span> <span class="n">myServer</span><span class="o">=</span><span class="n">server</span><span class="p">))</span>
<span class="n">activate</span><span class="p">(</span><span class="n">c4</span><span class="p">,</span> <span class="n">c4</span><span class="o">.</span><span class="n">getserved</span><span class="p">(</span><span class="n">servtime</span><span class="o">=</span><span class="mi">100</span><span class="p">,</span> <span class="n">myServer</span><span class="o">=</span><span class="n">server</span><span class="p">))</span>
<span class="n">simulate</span><span class="p">(</span><span class="n">until</span><span class="o">=</span><span class="mi">500</span><span class="p">)</span>
<span class="k">print</span><span class="p">(</span><span class="s">''</span><span class="p">)</span>
<span class="k">print</span><span class="p">(</span><span class="s">'(TimeAverage no. waiting: </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="n">server</span><span class="o">.</span><span class="n">waitMon</span><span class="o">.</span><span class="n">timeAverage</span><span class="p">())</span>
<span class="k">print</span><span class="p">(</span><span class="s">'(Number) Average no. waiting: </span><span class="si">%.4f</span><span class="s">'</span> <span class="o">%</span> <span class="n">server</span><span class="o">.</span><span class="n">waitMon</span><span class="o">.</span><span class="n">mean</span><span class="p">())</span>
<span class="k">print</span><span class="p">(</span><span class="s">'(Number) Var of no. waiting: </span><span class="si">%.4f</span><span class="s">'</span> <span class="o">%</span> <span class="n">server</span><span class="o">.</span><span class="n">waitMon</span><span class="o">.</span><span class="n">var</span><span class="p">())</span>
<span class="k">print</span><span class="p">(</span><span class="s">'(Number) SD of no. waiting: </span><span class="si">%.4f</span><span class="s">'</span> <span class="o">%</span> <span class="n">sqrt</span><span class="p">(</span><span class="n">server</span><span class="o">.</span><span class="n">waitMon</span><span class="o">.</span><span class="n">var</span><span class="p">()))</span>
<span class="k">print</span><span class="p">(</span><span class="s">'(TimeAverage no. in service: </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="n">server</span><span class="o">.</span><span class="n">actMon</span><span class="o">.</span><span class="n">timeAverage</span><span class="p">())</span>
<span class="k">print</span><span class="p">(</span><span class="s">'(Number) Average no. in service: </span><span class="si">%.4f</span><span class="s">'</span> <span class="o">%</span> <span class="n">server</span><span class="o">.</span><span class="n">actMon</span><span class="o">.</span><span class="n">mean</span><span class="p">())</span>
<span class="k">print</span><span class="p">(</span><span class="s">'(Number) Var of no. in service: </span><span class="si">%.4f</span><span class="s">'</span> <span class="o">%</span> <span class="n">server</span><span class="o">.</span><span class="n">actMon</span><span class="o">.</span><span class="n">var</span><span class="p">())</span>
<span class="k">print</span><span class="p">(</span><span class="s">'(Number) SD of no. in service: </span><span class="si">%.4f</span><span class="s">'</span> <span class="o">%</span> <span class="n">sqrt</span><span class="p">(</span><span class="n">server</span><span class="o">.</span><span class="n">actMon</span><span class="o">.</span><span class="n">var</span><span class="p">()))</span>
<span class="k">print</span><span class="p">(</span><span class="s">'='</span> <span class="o">*</span> <span class="mi">40</span><span class="p">)</span>
<span class="k">print</span><span class="p">(</span><span class="s">'Time history for the "server" waitQ:'</span><span class="p">)</span>
<span class="k">print</span><span class="p">(</span><span class="s">'[time, waitQ]'</span><span class="p">)</span>
<span class="k">for</span> <span class="n">item</span> <span class="ow">in</span> <span class="n">server</span><span class="o">.</span><span class="n">waitMon</span><span class="p">:</span>
<span class="k">print</span><span class="p">(</span><span class="n">item</span><span class="p">)</span>
<span class="k">print</span><span class="p">(</span><span class="s">'='</span> <span class="o">*</span> <span class="mi">40</span><span class="p">)</span>
<span class="k">print</span><span class="p">(</span><span class="s">'Time history for the "server" activeQ:'</span><span class="p">)</span>
<span class="k">print</span><span class="p">(</span><span class="s">'[time, activeQ]'</span><span class="p">)</span>
<span class="k">for</span> <span class="n">item</span> <span class="ow">in</span> <span class="n">server</span><span class="o">.</span><span class="n">actMon</span><span class="p">:</span>
<span class="k">print</span><span class="p">(</span><span class="n">item</span><span class="p">)</span>
</pre></div>
</div>
<p>Output:</p>
<div class="highlight-python"><pre>c1 requests 1 unit at t = 0
c2 requests 1 unit at t = 0
c3 requests 1 unit at t = 0
c4 requests 1 unit at t = 0
c1 done at t = 100
c2 done at t = 200
c3 done at t = 300
c4 done at t = 400
(TimeAverage no. waiting: 1.5
(Number) Average no. waiting: 1.2857
(Number) Var of no. waiting: 1.0612
(Number) SD of no. waiting: 1.0302
(TimeAverage no. in service: 1.0
(Number) Average no. in service: 0.4444
(Number) Var of no. in service: 0.2469
(Number) SD of no. in service: 0.4969
========================================
Time history for the "server" waitQ:
[time, waitQ]
[0, 0]
[0, 1]
[0, 2]
[0, 3]
[100, 2]
[200, 1]
[300, 0]
========================================
Time history for the "server" activeQ:
[time, activeQ]
[0, 0]
[0, 1]
[100, 0]
[100, 1]
[200, 0]
[200, 1]
[300, 0]
[300, 1]
[400, 0]
</pre>
</div>
</div>
<div class="section" id="shopping">
<h2>Shopping<a class="headerlink" href="#shopping" title="Permalink to this headline">¶</a></h2>
<div class="highlight-python" id="index-11"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">SimPy.Simulation</span> <span class="kn">import</span> <span class="n">Process</span><span class="p">,</span> <span class="n">activate</span><span class="p">,</span> <span class="n">hold</span><span class="p">,</span> <span class="n">initialize</span><span class="p">,</span> <span class="n">simulate</span>
<span class="k">class</span> <span class="nc">Customer</span><span class="p">(</span><span class="n">Process</span><span class="p">):</span>
<span class="k">def</span> <span class="nf">buy</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">budget</span><span class="o">=</span><span class="mi">0</span><span class="p">):</span>
<span class="k">print</span><span class="p">(</span><span class="s">'Here I am at the shops </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="bp">self</span><span class="o">.</span><span class="n">name</span><span class="p">)</span>
<span class="n">t</span> <span class="o">=</span> <span class="mf">5.0</span>
<span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">4</span><span class="p">):</span>
<span class="k">yield</span> <span class="n">hold</span><span class="p">,</span> <span class="bp">self</span><span class="p">,</span> <span class="n">t</span>
<span class="c"># executed 4 times at intervals of t time units</span>
<span class="k">print</span><span class="p">(</span><span class="s">'I just bought something </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="bp">self</span><span class="o">.</span><span class="n">name</span><span class="p">)</span>
<span class="n">budget</span> <span class="o">-=</span> <span class="mf">10.00</span>
<span class="k">print</span><span class="p">(</span><span class="s">'All I have left is </span><span class="si">%s</span><span class="s"> I am going home </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="p">(</span><span class="n">budget</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">name</span><span class="p">))</span>
<span class="n">initialize</span><span class="p">()</span>
<span class="c"># create a customer named "Evelyn",</span>
<span class="n">C</span> <span class="o">=</span> <span class="n">Customer</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s">'Evelyn'</span><span class="p">)</span>
<span class="c"># and activate her with a budget of 100</span>
<span class="n">activate</span><span class="p">(</span><span class="n">C</span><span class="p">,</span> <span class="n">C</span><span class="o">.</span><span class="n">buy</span><span class="p">(</span><span class="n">budget</span><span class="o">=</span><span class="mi">100</span><span class="p">),</span> <span class="n">at</span><span class="o">=</span><span class="mf">10.0</span><span class="p">)</span>
<span class="n">simulate</span><span class="p">(</span><span class="n">until</span><span class="o">=</span><span class="mf">100.0</span><span class="p">)</span>
</pre></div>
</div>
<p>Output:</p>
<div class="highlight-python"><pre>Here I am at the shops Evelyn
I just bought something Evelyn
I just bought something Evelyn
I just bought something Evelyn
I just bought something Evelyn
All I have left is 60.0 I am going home Evelyn
</pre>
</div>
</div>
<div class="section" id="storewidget">
<h2>Storewidget<a class="headerlink" href="#storewidget" title="Permalink to this headline">¶</a></h2>
<div class="highlight-python" id="index-12"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">SimPy.Simulation</span> <span class="kn">import</span> <span class="p">(</span><span class="n">Lister</span><span class="p">,</span> <span class="n">Process</span><span class="p">,</span> <span class="n">Store</span><span class="p">,</span> <span class="n">activate</span><span class="p">,</span> <span class="n">get</span><span class="p">,</span> <span class="n">hold</span><span class="p">,</span>
<span class="n">initialize</span><span class="p">,</span> <span class="n">now</span><span class="p">,</span> <span class="n">put</span><span class="p">,</span> <span class="n">simulate</span><span class="p">)</span>
<span class="k">class</span> <span class="nc">ProducerD</span><span class="p">(</span><span class="n">Process</span><span class="p">):</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="n">Process</span><span class="o">.</span><span class="n">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">produce</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="c"># the ProducerD PEM</span>
<span class="k">while</span> <span class="bp">True</span><span class="p">:</span>
<span class="k">yield</span> <span class="n">put</span><span class="p">,</span> <span class="bp">self</span><span class="p">,</span> <span class="n">buf</span><span class="p">,</span> <span class="p">[</span><span class="n">Widget</span><span class="p">(</span><span class="mi">9</span><span class="p">),</span> <span class="n">Widget</span><span class="p">(</span><span class="mi">7</span><span class="p">)]</span>
<span class="k">yield</span> <span class="n">hold</span><span class="p">,</span> <span class="bp">self</span><span class="p">,</span> <span class="mi">10</span>
<span class="k">class</span> <span class="nc">ConsumerD</span><span class="p">(</span><span class="n">Process</span><span class="p">):</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="n">Process</span><span class="o">.</span><span class="n">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">consume</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="c"># the ConsumerD PEM</span>
<span class="k">while</span> <span class="bp">True</span><span class="p">:</span>
<span class="n">toGet</span> <span class="o">=</span> <span class="mi">3</span>
<span class="k">yield</span> <span class="n">get</span><span class="p">,</span> <span class="bp">self</span><span class="p">,</span> <span class="n">buf</span><span class="p">,</span> <span class="n">toGet</span>
<span class="k">assert</span> <span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">got</span><span class="p">)</span> <span class="o">==</span> <span class="n">toGet</span>
<span class="k">print</span><span class="p">(</span><span class="s">'</span><span class="si">%s</span><span class="s"> Get widget weights </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="p">(</span><span class="n">now</span><span class="p">(),</span>
<span class="p">[</span><span class="n">x</span><span class="o">.</span><span class="n">weight</span> <span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">got</span><span class="p">]))</span>
<span class="k">yield</span> <span class="n">hold</span><span class="p">,</span> <span class="bp">self</span><span class="p">,</span> <span class="mi">11</span>
<span class="k">class</span> <span class="nc">Widget</span><span class="p">(</span><span class="n">Lister</span><span class="p">):</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">weight</span><span class="o">=</span><span class="mi">0</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">weight</span> <span class="o">=</span> <span class="n">weight</span>
<span class="n">widgbuf</span> <span class="o">=</span> <span class="p">[]</span>
<span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">10</span><span class="p">):</span>
<span class="n">widgbuf</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">Widget</span><span class="p">(</span><span class="mi">5</span><span class="p">))</span>
<span class="n">initialize</span><span class="p">()</span>
<span class="n">buf</span> <span class="o">=</span> <span class="n">Store</span><span class="p">(</span><span class="n">capacity</span><span class="o">=</span><span class="mi">11</span><span class="p">,</span> <span class="n">initialBuffered</span><span class="o">=</span><span class="n">widgbuf</span><span class="p">,</span> <span class="n">monitored</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span>
<span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">3</span><span class="p">):</span> <span class="c"># define and activate 3 producer objects</span>
<span class="n">p</span> <span class="o">=</span> <span class="n">ProducerD</span><span class="p">()</span>
<span class="n">activate</span><span class="p">(</span><span class="n">p</span><span class="p">,</span> <span class="n">p</span><span class="o">.</span><span class="n">produce</span><span class="p">())</span>
<span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">3</span><span class="p">):</span> <span class="c"># define and activate 3 consumer objects</span>
<span class="n">c</span> <span class="o">=</span> <span class="n">ConsumerD</span><span class="p">()</span>
<span class="n">activate</span><span class="p">(</span><span class="n">c</span><span class="p">,</span> <span class="n">c</span><span class="o">.</span><span class="n">consume</span><span class="p">())</span>
<span class="n">simulate</span><span class="p">(</span><span class="n">until</span><span class="o">=</span><span class="mi">50</span><span class="p">)</span>
<span class="k">print</span><span class="p">(</span><span class="s">'LenBuffer: </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="n">buf</span><span class="o">.</span><span class="n">bufferMon</span><span class="p">)</span> <span class="c"># length of buffer</span>
<span class="k">print</span><span class="p">(</span><span class="s">'getQ: </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="n">buf</span><span class="o">.</span><span class="n">getQMon</span><span class="p">)</span> <span class="c"># length of getQ</span>
<span class="k">print</span><span class="p">(</span><span class="s">'putQ </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="n">buf</span><span class="o">.</span><span class="n">putQMon</span><span class="p">)</span> <span class="c"># length of putQ</span>
</pre></div>
</div>
<p>Output:</p>
<div class="highlight-python"><pre>0 Get widget weights [5, 5, 5]
0 Get widget weights [5, 5, 5]
0 Get widget weights [5, 5, 5]
11 Get widget weights [5, 9, 7]
11 Get widget weights [9, 7, 9]
11 Get widget weights [7, 9, 7]
22 Get widget weights [9, 7, 9]
22 Get widget weights [7, 9, 7]
22 Get widget weights [9, 7, 9]
33 Get widget weights [7, 9, 7]
33 Get widget weights [9, 7, 9]
40 Get widget weights [7, 9, 7]
44 Get widget weights [9, 7, 9]
50 Get widget weights [7, 9, 7]
LenBuffer: [[0, 10], [0, 7], [0, 9], [0, 11], [0, 8], [0, 10], [0, 7], [10, 9], [10, 11], [11, 8], [11, 10], [11, 7], [11, 4], [20, 6], [20, 8], [21, 10], [22, 7], [22, 4], [22, 1], [30, 3], [30, 5], [31, 7], [33, 4], [33, 1], [40, 3], [40, 0], [40, 2], [41, 4], [44, 1], [50, 3], [50, 0], [50, 2]]
getQ: [[0, 0], [33, 1], [40, 0], [44, 1], [50, 0]]
putQ [[0, 0], [0, 1], [0, 2], [0, 3], [0, 2], [0, 1], [0, 0], [10, 1], [11, 0]]
</pre>
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<h3><a href="../index.html">Table Of Contents</a></h3>
<ul>
<li><a class="reference internal" href="#">Additional examples</a><ul>
<li><a class="reference internal" href="#car">Car</a></li>
<li><a class="reference internal" href="#cart">CarT</a></li>
<li><a class="reference internal" href="#cars">Cars</a></li>
<li><a class="reference internal" href="#carst">CarsT</a></li>
<li><a class="reference internal" href="#carwash">Carwash</a></li>
<li><a class="reference internal" href="#breakdown">Breakdown</a></li>
<li><a class="reference internal" href="#firework">Firework</a></li>
<li><a class="reference internal" href="#levelinventory">Levelinventory</a></li>
<li><a class="reference internal" href="#message">Message</a></li>
<li><a class="reference internal" href="#resource">Resource</a></li>
<li><a class="reference internal" href="#resource-monitor">Resource monitor</a></li>
<li><a class="reference internal" href="#shopping">Shopping</a></li>
<li><a class="reference internal" href="#storewidget">Storewidget</a></li>
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