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Subject: [OMPI users] Limit to number of processes on one node?
From: Prentice Bisbal (prentice_at_[hidden])
Date: 2010-03-03 11:51:19

Is there a limit on how many MPI processes can run on a single host?

I have a user trying to test his code on the command-line on a single
host before running it on our cluster like so:

mpirun -np X foo

When he tries to run it on large number of process (X = 256, 512), the
program fails, and I can reproduce this with a simple "Hello, World"

$ mpirun -np 256 mpihello
mpirun noticed that job rank 0 with PID 0 on node
exited on signal 15 (Terminated).
252 additional processes aborted (not shown)

I've done some testing and found that X <155 for this program to work.
Is this a bug, part of the standard, or design/implementation decision?

Prentice Bisbal
Linux Software Support Specialist/System Administrator
School of Natural Sciences
Institute for Advanced Study
Princeton, NJ