Hello Jingchao,
try to use -mca mpi_leave_pinned 0, also for multinode jobs.
kind regards,
Tobias Klöffel
On 02/06/2017 09:38 PM, Jingchao Zhang wrote:
Hi,
We recently noticed openmpi is using btl openib over self,sm for
single node jobs, which has caused performance degradation for some
applications, e.g. 'cp2k'. For opempi version 2.0.1, our test shows
single node 'cp2k' job using openib is ~25% slower than using self,sm.
We advise users do '--mca btl_base_exclude openib' as a temporary fix.
I need to point out that not all applications are affected by this
feature. Many of them have the same single-node performance
with/without openib. Why doesn't openmpi use self,sm by default for
single node jobs? Is this the intended behavior?
Thanks,
Jingchao
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M.Sc. Tobias Klöffel
=======================================================
Interdisciplinary Center for Molecular Materials (ICMM)
and Computer-Chemistry-Center (CCC)
Department Chemie und Pharmazie
Friedrich-Alexander-Universität Erlangen-Nürnberg
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D-91052 Erlangen, Germany
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Phone: +49 (0) 9131 / 85 - 20423
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E-mail: tobias.kloef...@fau.de
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