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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 13:11:51

Gus Correa wrote:

> Hi Eugene
> Thank you for answering one of my original questions.
> However, there seems to be a problem with the syntax.
> Is it really "-mca btl btl_sm_num_fifos=some_number"?

No. Try "--mca btl_sm_num_fifos 4". Or,

% setenv OMPI_MCA_btl_sm_num_fifos 4
% ompi_info -a | grep btl_sm_num_fifos # check that things were set
% mpirun -n 4 a.out

> When I grep any component starting with btl_sm I get nothing:
> ompi_info --all | grep btl_sm
> (No output)

I'm no guru, but I think the reason has something to do with dynamically
loaded somethings. E.g.,

% /home/eugene/ompi/bin/ompi_info --all | grep btl_sm_num_fifos
(no output)
% setenv OPAL_PREFIX /home/eugene/ompi
% set path = ( $OPAL_PREFIX/bin $path )
% ompi_info --all | grep btl_sm_num_fifos
                 MCA btl: parameter "btl_sm_num_fifos" (current value:
"1", data source: default value)