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 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? From: Zhou, Hui <[email protected]> Date: Monday, July 1, 2024 at 4:09 PM To: Niyaz Murshed <[email protected]>, [email protected] <[email protected]>, Jenke, Joachim <[email protected]> Cc: nd <[email protected]> Subject: Re: Custom rank for processes
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 Hello world from processor ampere-altra-2-1, rank 1 out of 5 processors Hello world from processor ampere-altra-2-1, rank 3 out of 5 processors Hello world from processor dpr740, rank 0 out of 5 processors Hello world from processor dpr740, rank 4 out of 5 processors Hello world from processor dpr740, rank 2 out of 5 processors
-bind-to user:10,11,12,13 This would mean on host 192.168.2.100 P0=>10 , P2=>11 This would mean on host 192.168.2.200 P0=>10 , P2=>11, P3=12 Is this correct understanding ? Is it also possible to say which rank process will be pinned to which core ?
Yes, that is correct. The ranks are assigned to hosts as shown in the hello world output.
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. Can I specify the below ranks? 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
Hello world from processor ampere-altra-2-1, rank 1 out of 5 processors => rank0 Hello world from processor ampere-altra-2-1, rank 3 out of 5 processors. => rank1 Hello world from processor dpr740, rank 0 out of 5 processors =>rank2 Hello world from processor dpr740, rank 4 out of 5 processors =>rank3 Hello world from processor dpr740, rank 2 out of 5 processors =>rank4
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. -- Hui