What are your threading options for OpenMPI (when it was built) ?
I have seen OpenIB BTL completely lock when some level of threading is
enabled before.
Maxime Boissonneault
Le 2014-06-24 18:18, Fischer, Greg A. a écrit :
Hello openmpi-users,
A few weeks ago, I posted to the list about difficulties I was having
getting openib to work with Torque (see "openib segfaults with
Torque", June 6, 2014). The issues were related to Torque imposing
restrictive limits on locked memory, and have since been resolved.
However, now that I've had some time to test the applications, I'm
seeing abysmal performance over the openib layer. Applications run
with the tcp btl execute about 10x faster than with the openib btl.
Clearly something still isn't quite right.
I tried running with "-mca btl_openib_verbose 1", but didn't see
anything resembling a smoking gun. How should I go about determining
the source of the problem? (This uses the same OpenMPI Version 1.8.1 /
SLES11 SP3 / GCC 4.8.3 setup discussed previously.)
Thanks,
Greg
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Maxime Boissonneault
Analyste de calcul - Calcul Québec, Université Laval
Ph. D. en physique
