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<title>GAP (HAP) - Chapter 21: Parallel Computation - Core Functions</title>
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<div class="ChapSects"><a href="chap21.html#X85F9DF1985B88C37">21. <span class="Heading"> Parallel Computation - Core Functions</span></a>
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<h3>21. <span class="Heading"> Parallel Computation - Core Functions</span></h3>
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<td class="tdleft"><code class="code">ChildProcess()</code> <br /> <code class="code">ChildProcess("computer.ac.wales")</code></p>
<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 the address of a remote computer for which ssh has been configured to require no password from the user.</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 user@remotehost:~/<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.)</td>
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<td class="tdleft"><code class="code">ChildClose(s)</code></p>
<p>This closes the stream s to a child GAP process.</td>
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<td class="tdleft"><code class="code">ChildCommand("cmd;",s)</code></p>
<p>This runs a GAP command "cmd;" on the child process accessed by the stream s. Here "cmd;" is a string representing the command.</td>
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<td class="tdleft"><code class="code"> NextAvailableChild(L)</code></p>
<p>Inputs a list L of child processes and returns a child in L which is ready for computation (as soon as such a child is available).</td>
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<td class="tdleft"><code class="code"> IsAvailableChild(s)</code></p>
<p>Inputs a child process s and returns true if s is currently available for computations, and false otherwise.</td>
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<td class="tdleft"><code class="code"> ChildPut(A,"B",s)</code></p>
<p>This copies a GAP object A on the parent process to an object B on the child process s. (The copying relies on the function PrintObj(A); )</td>
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<td class="tdleft"><code class="code"> ChildGet("A",s)</code></p>
<p>This functions copies a GAP object A on the child process s and returns it on the parent process. (The copying relies on the function PrintObj(A); )</td>
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<td class="tdleft"><code class="code">HAPPrintTo("file",R)</code></p>
<p>Inputs a name "file" 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.</td>
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<td class="tdleft"><code class="code">HAPRead("file",R)</code></p>
<p>Inputs a name "file" containing a HAP object R and returns the object. Currently this is only implemented for R equal to a resolution.</td>
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