[torqueusers] problem with jobs sharing cores

Zulauf, Michael Michael.Zulauf at iberdrolaren.com
Mon Feb 13 16:22:36 MST 2012

A big thinks to Ken Nielson, Jim Coyle, and Fotis Georgatos - based on
their help I made some significant progress today.  I haven't completely
worked out all the details yet, but I've found that by switching to
OpenMPI, I do not get the same problematic behavior.  So it seems most
likely that the source of the problem has something to do with a
configuration detail of our mvapich2 installation.


According to some earlier benchmarking I'd done, mvapich2 seems to offer
better performance across our infiniband interconnect, so I'd like to
see if I can get to the bottom of the issue with that.  Alternatively, I
could use mvapich2 for the "large" jobs (which span multiple nodes), and
use OpenMPI for the "small" jobs (which will share a node with other
jobs).  I'd prefer to avoid the "dual MPI" alternative, as then we'd
have to build all executables twice, and some of them are a bit tricky.
Still, I suppose it's an option.


In any case, thanks again.  Now maybe I can go haunt the mvapich2 lists,
or at least start trying to dig up the solution in that documentation.


Happy computing,




Mike Zulauf

Meteorologist, Lead Senior

Asset Optimization 

Iberdrola Renewables

1125 NW Couch, Suite 700

Portland, OR 97209

Office: 503-478-6304  Cell: 503-913-0403


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