You can manually set the exact binding you desire. For example, assuming you have 8 cores, you may try –

    mpiexec -bind-to user:0,1+2+3+4+5+6+7 -ppn 2 -n ….

to bind the first process to core 0, and the 2^nd process to 1-7.

Additional help is available with

    mpiexec -bind-to -help

-- 
Hui Zhou

From: John Cary via discuss <discuss@mpich.org>
Date: Sunday, February 21, 2021 at 3:18 PM
To: discuss@mpich.org <discuss@mpich.org>
Cc: John Cary <cary@colorado.edu>
Subject: [mpich-discuss] Does mpich have or have planned fine grained affinity control?

I would like to, eg, launch 2 processes per node, with one bound to one core
(used to drive a GPU), and the other to use the remaining cores for doing
thread-parallel computing.

Is this possible with MPICH?

Thx.....John Cary
_______________________________________________
discuss mailing list     discuss@mpich.org
To manage subscription options or unsubscribe:
https://lists.mpich.org/mailman/listinfo/discuss