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Subject: [OMPI users] Duplicate independent processes
From: Kristian Medri (kmedri_at_[hidden])
Date: 2011-01-05 18:57:11


Any hints on what to look for to get the second machine to behave without
duplicate independent processes?

"mpirun -np 2 ..."

Provides as expected:

"Using MPI version 2.1, 2 processes
.1.
.2."

While on another similar machine:

"Using MPI version 2.2, 1 processes
.1.
Using MPI version 2.2, 1 processes
.1.
.2.
.2."

On both:

/usr/lib64/openmpi/1.4-gcc/bin/mpirun --version

Returns:

mpirun (Open MPI) 1.4

I looked in the FAQ and searched the list but did not find it yet. When I
worked with MPICH2 I also had this happen from time to time. I can provide
additional information should it not be as common here.