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Subject: Re: [OMPI users] How do I run OpenMPI safely on a Nehalem standalone machine?
From: Eugene Loh (eugene.loh_at_[hidden])
Date: 2010-05-06 10:37:27


Ralph Castain wrote:

>Yo Gus
>
>Just saw a ticket go by reminding us about continuing hang problems on shared memory when building with gcc 4.4.x - any chance you are in that category? You might have said something earlier in this thread....
>
>
Going back to the original e-mail in this thread:

Gus Correa wrote:

> Use -mca btl -mca btl_sm_num_fifos=some_number ? (Which number?)

Another experiment to try would be to keep sm on, but try changing
btl_sm_num_fifos as above. The number to use would be the number of
processes on the node. E.g., if all processes are running on the same
box, just use the same number as processes in the job. The results
might help narrow down the possibilities here.