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<title>Class timer</title>
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<div class="refentry" title="Class timer">
<a name="boost.mpi.timer"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2><span class="refentrytitle">Class timer</span></h2>
<p>boost::mpi::timer — A simple timer that provides access to the MPI timing facilities. </p>
</div>
<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="emphasis"><em>// In header: <<a class="link" href="../../mpi/reference.html#header.boost.mpi.timer_hpp" title="Header <boost/mpi/timer.hpp>">boost/mpi/timer.hpp</a>>
</em></span>
<span class="bold"><strong>class</strong></span> <a class="link" href="timer.html" title="Class timer">timer</a> {
<span class="bold"><strong>public</strong></span>:
<span class="emphasis"><em>// <a class="link" href="timer.html#boost.mpi.timerconstruct-copy-destruct">construct/copy/destruct</a></em></span>
<a class="link" href="timer.html#id897881-bb">timer</a>();
<span class="emphasis"><em>// <a class="link" href="timer.html#id897816-bb">public member functions</a></em></span>
<span class="type"><span class="bold"><strong>void</strong></span></span> <a class="link" href="timer.html#id897819-bb">restart</a>() ;
<span class="type">double</span> <a class="link" href="timer.html#id897839-bb">elapsed</a>() <span class="bold"><strong>const</strong></span>;
<span class="type">double</span> <a class="link" href="timer.html#id897851-bb">elapsed_max</a>() <span class="bold"><strong>const</strong></span>;
<span class="type">double</span> <a class="link" href="timer.html#id897865-bb">elapsed_min</a>() <span class="bold"><strong>const</strong></span>;
<span class="emphasis"><em>// <a class="link" href="timer.html#id897894-bb">public static functions</a></em></span>
<span class="type"><span class="bold"><strong>static</strong></span> <span class="bold"><strong>bool</strong></span></span> <a class="link" href="timer.html#id897897-bb">time_is_global</a>() ;
};</pre></div>
<div class="refsect1" title="Description">
<a name="id1415663"></a><h2>Description</h2>
<p>The <code class="computeroutput">timer</code> class is a simple wrapper around the MPI timing facilities that mimics the interface of the Boost Timer library. </p>
<div class="refsect2" title="timer public construct/copy/destruct">
<a name="id1415677"></a><h3>
<a name="boost.mpi.timerconstruct-copy-destruct"></a><code class="computeroutput">timer</code>
public
construct/copy/destruct</h3>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<pre class="literallayout"><a name="id897881-bb"></a>timer();</pre>
<p>Initializes the timer</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term">Postconditions:</span></p></td>
<td><p><code class="computeroutput">elapsed()</code> == 0 </p></td>
</tr></tbody>
</table></div>
</li></ol></div>
</div>
<div class="refsect2" title="timer public member functions">
<a name="id1415732"></a><h3>
<a name="id897816-bb"></a><code class="computeroutput">timer</code> public member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="type"><span class="bold"><strong>void</strong></span></span> <a name="id897819-bb"></a>restart() ;</pre>
<p>Restart the timer.</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term">Postconditions:</span></p></td>
<td><p><code class="computeroutput">elapsed()</code> == 0 </p></td>
</tr></tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="type">double</span> <a name="id897839-bb"></a>elapsed() <span class="bold"><strong>const</strong></span>;</pre>
<p>Return the amount of time that has elapsed since the last construction or reset, in seconds. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="type">double</span> <a name="id897851-bb"></a>elapsed_max() <span class="bold"><strong>const</strong></span>;</pre>
<p>Return an estimate of the maximum possible value of elapsed(). Note that this routine may return too high a value on some systems. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="type">double</span> <a name="id897865-bb"></a>elapsed_min() <span class="bold"><strong>const</strong></span>;</pre>
<p>Returns the minimum non-zero value that <code class="computeroutput">elapsed()</code> may return. This is the resolution of the timer. </p>
</li>
</ol></div>
</div>
<div class="refsect2" title="timer public static functions">
<a name="id1415873"></a><h3>
<a name="id897894-bb"></a><code class="computeroutput">timer</code> public static functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<pre class="literallayout"><span class="type"><span class="bold"><strong>static</strong></span> <span class="bold"><strong>bool</strong></span></span> <a name="id897897-bb"></a>time_is_global() ;</pre>
<p>Determines whether the elapsed time values are global times or local processor times. </p>
</li></ol></div>
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<td align="right"><div class="copyright-footer">Copyright © 2005-2007 Douglas Gregor,
Matthias Troyer, Trustees of Indiana University<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">
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