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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="MsoNormal"><span style="font-size:11.0pt">Sorry to bother you again with silly questions.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">How do I read the below : <o:p>
</o:p></span></p>
<p class="MsoNormal"><span style="color:black;background:white">-rankmap (vector,1,1,0,0,0)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black;background:white"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black;background:white">I have 5 processes. 1 1 => means node1 will get first 2 processes ?
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="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?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="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<o:p></o:p></span></p>
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<p class="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<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">Hello world from processor ampere-altra-2-1, rank 1 out of 5 processors<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">Hello world from processor ampere-altra-2-1, rank 3 out of 5 processors<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">Hello world from processor dpr740, rank 0 out of 5 processors<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">Hello world from processor dpr740, rank 4 out of 5 processors<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">Hello world from processor dpr740, rank 2 out of 5 processors<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">> -bind-to user:10,11,12,13<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">> This would mean on host 192.168.2.100<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">> P0=>10 , P2=>11<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">> This would mean on host 192.168.2.200<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">> P0=>10 , P2=>11, P3=12<o:p></o:p></span></p>
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<p class="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>
<br>
Yes, that is correct. The ranks are assigned to hosts as shown in the hello world output.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"> <o:p></o:p></span></p>
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<p class="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.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">> Can I specify the below ranks?<o:p></o:p></span></p>
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<p class="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<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:black">> Hello world from processor ampere-altra-2-1, rank 1 out of 5 processors => rank0<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">> Hello world from processor ampere-altra-2-1, rank 3 out of 5 processors. => rank1<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">> Hello world from processor dpr740, rank 0 out of 5 processors =>rank2<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">> Hello world from processor dpr740, rank 4 out of 5 processors =>rank3<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">> Hello world from processor dpr740, rank 2 out of 5 processors =>rank4<br>
<br>
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.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:black">--<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">Hui<o:p></o:p></span></p>
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