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Asked: 2026-06-11T00:40:50+00:00

I’m using MPI to execute a parallel job over a heterogeneous compute system. The

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I’m using MPI to execute a parallel job over a heterogeneous compute system. The nodes in my network are not all identical.

I would like to specify that machine ‘A.univ.edu’ has rank 0 and machine ‘B.univ.edu’ has rank 1.

Is there any way to specify how ranks are assigned to hosts in MPI?

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  1. Editorial Team

    It looks like at least OpenMPI allows you to specify a rankfile

    The above example would be as follows

    rankfile.txt:
rank 0=A.univ.edu slot=0
rank 1=B.univ.edu slot=0

mpiexec -np 2 -H A.univ.edu,B.univ.edu -rf rankfile.txt executable.exe

    http://mirror.its.dal.ca/openmpi/doc/v1.5/man1/mpiexec.1.php#sect9

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