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<div class="ChapSects"><a href="chap36.html#X85F9DF1985B88C37">36 <span class="Heading"> Parallel Computation - Core Functions</span></a>
<div class="ContSect"><span class="tocline"><span class="nocss"> </span><a href="chap36.html#X7CFDEEC07F15CF82">36.1 <span class="Heading"> </span></a>
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<span class="ContSS"><br /><span class="nocss"> </span><a href="chap36.html#X83CCD55F86D927B7">36.1-1 ChildProcess</a></span>
<span class="ContSS"><br /><span class="nocss"> </span><a href="chap36.html#X80D8F17A803964C7">36.1-2 ChildClose</a></span>
<span class="ContSS"><br /><span class="nocss"> </span><a href="chap36.html#X8341AA7B87037076">36.1-3 ChildCommand</a></span>
<span class="ContSS"><br /><span class="nocss"> </span><a href="chap36.html#X7D2312CF84C453D0">36.1-4 NextAvailableChild</a></span>
<span class="ContSS"><br /><span class="nocss"> </span><a href="chap36.html#X7E4327F67D13572E">36.1-5 IsAvailableChild</a></span>
<span class="ContSS"><br /><span class="nocss"> </span><a href="chap36.html#X7CAEA866804C8020">36.1-6 ChildPut</a></span>
<span class="ContSS"><br /><span class="nocss"> </span><a href="chap36.html#X7994121C87DC5ACE">36.1-7 ChildGet</a></span>
<span class="ContSS"><br /><span class="nocss"> </span><a href="chap36.html#X810978457C788DE7">36.1-8 HAPPrintTo</a></span>
<span class="ContSS"><br /><span class="nocss"> </span><a href="chap36.html#X790D15437EC2A0B0">36.1-9 HAPRead</a></span>
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<h3>36 <span class="Heading"> Parallel Computation - Core Functions</span></h3>
<p><a id="X7CFDEEC07F15CF82" name="X7CFDEEC07F15CF82"></a></p>
<h4>36.1 <span class="Heading"> </span></h4>
<p><a id="X83CCD55F86D927B7" name="X83CCD55F86D927B7"></a></p>
<h5>36.1-1 ChildProcess</h5>
<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">‣ ChildProcess</code>( )</td><td class="tdright">( function )</td></tr></table></div>
<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">‣ ChildProcess</code>( <var class="Arg">arg</var> )</td><td class="tdright">( function )</td></tr></table></div>
<p>This starts a GAP session as a child process and returns a stream to the child process. If no argument is given then the child process is created on the local machine; otherwise the argument should be:<br /> 1) <span class="SimpleMath">arg</span>="computer.ac.wales" the address of a remote computer for which ssh has been configured to require no password from the user;<br /> (2) <span class="SimpleMath">arg</span>=["-m", "100000M", "-T"] a list of GAP command line options;<br /> (3) <span class="SimpleMath">arg</span>="computer.ac.wales", ["-m", "100000M", "-T"] the address of a computer followed by a list of command line options.</p>
<p>(To configure ssh so that the user can login without a password prompt from "thishost" to "remotehost" either consult "man ssh" or <br /> <br /> - open a shell on thishost<br /> - cd .ssh<br /> - ls<br /> -> if id_dsa, id_rsa etc exists, skip the next two steps!<br /> - ssh-keygen -t rsa<br /> - ssh-keygen -t dsa<br /> - scp *.pub userremotehost:~/<br /> - ssh remotehost -l user<br /> - cat id_rsa.pub >> .ssh/authorized_keys<br /> - cat id_dsa.pub >> .ssh/authorized_keys<br /> - rm id_rsa.pub id_dsa.pub<br /> - exit<br /> <br /> You should now be able to connect from "thishost" to "remotehost" without a password prompt.)</p>
<p><strong class="button">Examples:</strong> <span class="URL"><a href="../www/SideLinks/About/aboutBogomolov.html">1</a></span> , <span class="URL"><a href="../www/SideLinks/About/aboutParallel.html">2</a></span> </p>
<p><a id="X80D8F17A803964C7" name="X80D8F17A803964C7"></a></p>
<h5>36.1-2 ChildClose</h5>
<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">‣ ChildClose</code>( <var class="Arg">s</var> )</td><td class="tdright">( function )</td></tr></table></div>
<p>This closes the stream s to a child GAP process.</p>
<p><strong class="button">Examples:</strong> <span class="URL"><a href="../www/SideLinks/About/aboutBogomolov.html">1</a></span> </p>
<p><a id="X8341AA7B87037076" name="X8341AA7B87037076"></a></p>
<h5>36.1-3 ChildCommand</h5>
<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">‣ ChildCommand</code>( <var class="Arg">str</var>, <var class="Arg">s</var> )</td><td class="tdright">( function )</td></tr></table></div>
<p>This runs a GAP command <span class="SimpleMath">str</span>="cmd;" on the child process accessed by the stream s. Here "cmd;" is a string representing the command.</p>
<p><strong class="button">Examples:</strong> <span class="URL"><a href="../www/SideLinks/About/aboutBogomolov.html">1</a></span> , <span class="URL"><a href="../www/SideLinks/About/aboutParallel.html">2</a></span> </p>
<p><a id="X7D2312CF84C453D0" name="X7D2312CF84C453D0"></a></p>
<h5>36.1-4 NextAvailableChild</h5>
<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">‣ NextAvailableChild</code>( <var class="Arg">L</var> )</td><td class="tdright">( function )</td></tr></table></div>
<p>Inputs a list <span class="SimpleMath">L</span> of child processes and returns a child in <span class="SimpleMath">L</span> which is ready for computation (as soon as such a child is available).</p>
<p><strong class="button">Examples:</strong> <span class="URL"><a href="../www/SideLinks/About/aboutBogomolov.html">1</a></span> , <span class="URL"><a href="../www/SideLinks/About/aboutParallel.html">2</a></span> </p>
<p><a id="X7E4327F67D13572E" name="X7E4327F67D13572E"></a></p>
<h5>36.1-5 IsAvailableChild</h5>
<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">‣ IsAvailableChild</code>( <var class="Arg">s</var> )</td><td class="tdright">( function )</td></tr></table></div>
<p>Inputs a child process <span class="SimpleMath">s</span> and returns true if s is currently available for computations, and false otherwise.</p>
<p><strong class="button">Examples:</strong> <span class="URL"><a href="../www/SideLinks/About/aboutParallel.html">1</a></span> </p>
<p><a id="X7CAEA866804C8020" name="X7CAEA866804C8020"></a></p>
<h5>36.1-6 ChildPut</h5>
<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">‣ ChildPut</code>( <var class="Arg">A</var>, <var class="Arg">str</var>, <var class="Arg">s</var> )</td><td class="tdright">( function )</td></tr></table></div>
<p>This copies a GAP object A on the parent process to an object B=<span class="SimpleMath">str</span> on the child process s. (The copying relies on the function PrintObj(A); )</p>
<p><strong class="button">Examples:</strong> <span class="URL"><a href="../www/SideLinks/About/aboutBogomolov.html">1</a></span> , <span class="URL"><a href="../www/SideLinks/About/aboutParallel.html">2</a></span> </p>
<p><a id="X7994121C87DC5ACE" name="X7994121C87DC5ACE"></a></p>
<h5>36.1-7 ChildGet</h5>
<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">‣ ChildGet</code>( <var class="Arg">str</var>, <var class="Arg">s</var> )</td><td class="tdright">( function )</td></tr></table></div>
<p>This functions copies a GAP object A="str" on the child process s and returns it on the parent process. (The copying relies on the function PrintObj(A); )</p>
<p><strong class="button">Examples:</strong> <span class="URL"><a href="../www/SideLinks/About/aboutBogomolov.html">1</a></span> , <span class="URL"><a href="../www/SideLinks/About/aboutParallel.html">2</a></span> </p>
<p><a id="X810978457C788DE7" name="X810978457C788DE7"></a></p>
<h5>36.1-8 HAPPrintTo</h5>
<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">‣ HAPPrintTo</code>( <var class="Arg">str</var>, <var class="Arg">R</var> )</td><td class="tdright">( function )</td></tr></table></div>
<p>Inputs a string <span class="SimpleMath">str</span>="file" giving the address of a new text file and a HAP object R. It writes the object R to "file". Currently this is only implemented for R equal to a resolution.</p>
<p><strong class="button">Examples:</strong> <span class="URL"><a href="../www/SideLinks/About/aboutParallel.html">1</a></span> </p>
<p><a id="X790D15437EC2A0B0" name="X790D15437EC2A0B0"></a></p>
<h5>36.1-9 HAPRead</h5>
<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">‣ HAPRead</code>( <var class="Arg">str</var>, <var class="Arg">R</var> )</td><td class="tdright">( function )</td></tr></table></div>
<p>Inputs an address <span class="SimpleMath">str</span>="file" of a file containing a HAP object R and returns the object. Currently this is only implemented for R equal to a resolution.</p>
<p><strong class="button">Examples:</strong> <span class="URL"><a href="../www/SideLinks/About/aboutParallel.html">1</a></span> </p>
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