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Yes, you can use rankmap to simply list out the node assignment for each rank. "-rankmap (vector,1,1,0,0,0)" is a list of 5 node ids, one for each rank. So rank 0 gets node 1, rank 1 gets node 1, rank 2 gets node 0, and so on.</div>
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The -hosts options is convenient if you have somewhat uniform assignment. If you want arbitrary assignment, just use -rankmap option.</div>
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Hui</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Niyaz Murshed <Niyaz.Murshed@arm.com><br>
<b>Sent:</b> Monday, July 1, 2024 4:30 PM<br>
<b>To:</b> Zhou, Hui <zhouh@anl.gov>; discuss@mpich.org <discuss@mpich.org>; Jenke, Joachim <jenke@itc.rwth-aachen.de><br>
<b>Cc:</b> nd <nd@arm.com><br>
<b>Subject:</b> Re: Custom rank for processes</font>
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Sorry to bother you again with silly questions. How do I read the below : -rankmap (vector,1,1,0,0,0) I have 5 processes. 1 1 => means node1 will get first 2 processes ? -hosts 192. 168. 2. 100: 2,192. 168. 2. 200: 3 : this will give 2 process in
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<p class="x_MsoNormal"><span style="font-size:11.0pt">Sorry to bother you again with silly questions.</span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt"> </span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt">How do I read the below : </span>
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<p class="x_MsoNormal"><span style="color:black; background:white">-rankmap (vector,1,1,0,0,0)</span></p>
<p class="x_MsoNormal"><span style="color:black; background:white"> </span></p>
<p class="x_MsoNormal"><span style="color:black; background:white">I have 5 processes. 1 1 => means node1 will get first 2 processes ?
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<p class="x_MsoNormal"><span style="font-size:11.0pt"> </span></p>
<p class="x_MsoNormal"><span style="color:black">-hosts 192.168.2.100:2,192.168.2.200:3 : this will give 2 process in 100 and 3 in 200 .. Still won’t be able to specify which ranks goes to which node. Rank0 will be on node 100 .. what If I want Rank0 on node
200?</span></p>
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<p class="x_MsoNormal" style="margin-bottom:12.0pt"><b><span style="color:black">From:
</span></b><span style="color:black">Zhou, Hui <zhouh@anl.gov><br>
<b>Date: </b>Monday, July 1, 2024 at 4:09</span><span style="font-family:"Arial",sans-serif; color:black"> </span><span style="color:black">PM<br>
<b>To: </b>Niyaz Murshed <Niyaz.Murshed@arm.com>, discuss@mpich.org <discuss@mpich.org>, Jenke, Joachim <jenke@itc.rwth-aachen.de><br>
<b>Cc: </b>nd <nd@arm.com><br>
<b>Subject: </b>Re: Custom rank for processes</span></p>
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<p class="x_MsoNormal"><span style="color:black">> root@ampere-altra-2-1:/# mpirun -n 5 -bind-to user:10,11,12,13 -hosts 192.168.2.200,192.168.2.100 /mpitutorial/tutorials/mpi-hello-world/code/mpi_hello_world</span></p>
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<p class="x_MsoNormal"><span style="color:black">Hello world from processor ampere-altra-2-1, rank 1 out of 5 processors</span></p>
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<p class="x_MsoNormal"><span style="color:black">Hello world from processor ampere-altra-2-1, rank 3 out of 5 processors</span></p>
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<p class="x_MsoNormal"><span style="color:black">Hello world from processor dpr740, rank 0 out of 5 processors</span></p>
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<p class="x_MsoNormal"><span style="color:black">Hello world from processor dpr740, rank 4 out of 5 processors</span></p>
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<p class="x_MsoNormal"><span style="color:black">Hello world from processor dpr740, rank 2 out of 5 processors</span></p>
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<p class="x_MsoNormal"><span style="color:black"> </span></p>
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<p class="x_MsoNormal"><span style="color:black">> -bind-to user:10,11,12,13</span></p>
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<p class="x_MsoNormal"><span style="color:black">> This would mean on host 192.168.2.100</span></p>
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<p class="x_MsoNormal"><span style="color:black">> P0=>10 , P2=>11</span></p>
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<p class="x_MsoNormal"><span style="color:black">> This would mean on host 192.168.2.200</span></p>
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<p class="x_MsoNormal"><span style="color:black">> P0=>10 , P2=>11, P3=12</span></p>
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<p class="x_MsoNormal"><span style="color:black">> Is this correct understanding ? Is it also possible to say which rank process will be pinned to which core ?<br>
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Yes, that is correct. The ranks are assigned to hosts as shown in the hello world output.</span></p>
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<p class="x_MsoNormal"><span style="color:black"> </span></p>
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<p class="x_MsoNormal"><span style="color:black"> </span></p>
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<p class="x_MsoNormal"><span style="color:black">> About the rankmap:, trying to understand if I can select where a particular rank would be from > list of hosts. Currently, the first host in the list always get rank0.</span></p>
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<p class="x_MsoNormal"><span style="color:black">> Can I specify the below ranks?</span></p>
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<p class="x_MsoNormal"><span style="color:black">> mpirun -n 5 -bind-to user:10,11,12,13 -hosts 192.168.2.200,192.168.2.100 /mpitutorial/tutorials/mpi-hello-world/code/mpi_hello_world</span></p>
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<p class="x_MsoNormal"><span style="color:black">> </span></p>
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<p class="x_MsoNormal"><span style="color:black">> Hello world from processor ampere-altra-2-1, rank 1 out of 5 processors => rank0</span></p>
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<p class="x_MsoNormal"><span style="color:black">> Hello world from processor ampere-altra-2-1, rank 3 out of 5 processors. => rank1</span></p>
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<p class="x_MsoNormal"><span style="color:black">> Hello world from processor dpr740, rank 0 out of 5 processors =>rank2</span></p>
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<p class="x_MsoNormal"><span style="color:black">> Hello world from processor dpr740, rank 4 out of 5 processors =>rank3</span></p>
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<p class="x_MsoNormal"><span style="color:black">> Hello world from processor dpr740, rank 2 out of 5 processors =>rank4<br>
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Yes. You can use "-rankmap (vector,1,1,0,0,0)". Alternatively, you can use "-hosts 192.168.2.100:2,192.168.2.200:3", the colon syntax specifies how many processes you want to assign to each host.</span></p>
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<p class="x_MsoNormal"><span style="color:black"> </span></p>
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<p class="x_MsoNormal"><span style="color:black">--</span></p>
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<p class="x_MsoNormal"><span style="color:black">Hui</span></p>
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