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📁 国外MPI教材
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"><head>	<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />	<style type="text/css">	body { font-family: Verdana, Arial, Helvetica, sans-serif;}	a.at-term {	font-style: italic; }	</style>	<title>MPI Processes Created</title>	<meta name="Generator" content="ATutor">	<meta name="Keywords" content=""></head><body> <h3>Confirming the MPI processes</h3>

<p>When the demonstration program discussed in the last section was executed, 4 MPI processes were requested. The name of the parallel program run was mark. It was executed with the mpirun command. Here is the output from the first ps call:</p> 

<pre><code> R: 0  ps using MPI only
       PID       PPID    STIME     ELAPSED  P COMMAND
   1255106    1265106 15:55:22        0:01  * sh 
   1120158    1135850 10:28:28     5:26:55  * sh 
   1247528    1256632 15:33:53       21:30  * sh 
   1264741    1255106 15:55:23        0:00  * mpirun 
<em class="blue">   1264866    1264945 15:55:23        0:00  7 mark
</em>
   1264945    1264741 15:55:23        0:00  * mark
<em class="blue">   1265077    1264945 15:55:23        0:00  * mark
</em>
   1265106    1265399 15:55:21        0:02  * sh 
<em class="blue">   1265121    1264945 15:55:23        0:00  3 mark 
   1265333    1264945 15:55:23        0:00  0 mark</em>
   1265406    1265077 15:55:23        0:00 16 ps 
</code></pre>

<p>We know that the four processes shown in blue are the MPI processes because (although they have different process ids (PID) ) they have the <b>same</b> parent process id (PPID), meaning they were spawned from that parent process. Also, each of the blue processes has the name of the parallel program.</p>

<p>But even more important, from this output we can see that the MPI <em>processes</em> are running on separate <em>processors</em>. The logical processor number is shown in the column labelled P. An asterisk in the Processor Number column indicates that that particular process is
idle at present (not executing code). My guess would be
that the MPI process with PID 1265077 corresponds to the Boss process, which would finish its code before the workers (on average).</p></body></html>
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