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<p class="MsoNormal"><span style="font-size:11.0pt">If you are using hydra – the default launcher installed with MPICH, the “-hosts” option accepts a comma separated list, so something like “-hosts node1:4,node2:4,node3:4”. The “:4” tells the launcher to assign
4 processes per host, so you don’t need another “-map-by” option. Alternatively, you could use “-hosts node1,node2,node3 -ppn 4” for the same effect.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">-- <br>
Hui Zhou<o:p></o:p></span></p>
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<b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">Jeffrey Layton via discuss <discuss@mpich.org><br>
<b>Date: </b>Tuesday, October 8, 2024 at 6:50</span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"> </span><span style="font-size:12.0pt;color:black">AM<br>
<b>To: </b>discuss@mpich.org <discuss@mpich.org><br>
<b>Cc: </b>Jeffrey Layton <laytonjb@gmail.com><br>
<b>Subject: </b>[mpich-discuss] How to use ppr with mpiexec?<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in;mso-line-height-alt:.75pt"><span style="font-size:1.0pt;color:white">Good morning, I'm trying to "port" an Open MPI script with MPICH and I'm having some trouble. I've got a few questions. What is the form of the
"-hosts" option? Is it something like '-hosts node1:</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">4 node2:</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">4<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:18.0pt">Good morning,<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:18.0pt">I'm trying to "port" an Open MPI script with MPICH and I'm having some trouble. I've got a few questions.<o:p></o:p></span></p>
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<![if !supportLists]><span style="font-size:18.0pt"><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:18.0pt">What is the form of the "-hosts" option? Is it something like '-hosts node1:4 node2:4 node3:4 ...'?<o:p></o:p></span></p>
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<![if !supportLists]><span style="font-size:18.0pt"><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:18.0pt">The Open MPI script has an option "-map-by ppr:4:node" that tells it to run 4 processes per node and then it runs as many nodes as needed to meet the number of processes. How can I do this in MPICH?<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:18.0pt">Thanks for the help!<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:18.0pt">Jeff<o:p></o:p></span></p>
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