Hi all - I’m trying to run mixed MPI/OpenMP, so I ideally want binding of each
MPI process to a small set of cores (to allow for the OpenMP threads). From
the mpirun docs at
https://www.open-mpi.org//doc/current/man1/mpirun.1.php
<https://www.open-mpi.org//doc/current/man1/mpirun.1.php>
I got the example that I thought corresponded to what I want,
% mpirun ... --map-by core:PE=2 --bind-to core
So I tried
mpirun -x OMP_NUM_THREADS --map-by core:PE=4 --bind-to core -np 32 python …..
However, when I run this (with openmpi 3.0.0 or with 1.8.8) I get the following
error:
A request for multiple cpus-per-proc was given, but a directive
was also give to map to an object level that cannot support that
directive.
Please specify a mapping level that has more than one cpu, or
else let us define a default mapping that will allow multiple
cpus-per-proc.
Am I doing something wrong, or is there a mistake in the docs, and it should
bind to something other than core?
thanks,
Noam
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