Are you speaking of the configure for the application or for OpenMPI? I have no control over the application since it is provided as an executable only.
Jim > -----Original Message----- > From: users-boun...@open-mpi.org > [mailto:users-boun...@open-mpi.org] On Behalf Of Gus Correa > Sent: Tuesday, June 23, 2009 2:01 PM > To: Open MPI Users > Subject: Re: [OMPI users] 50% performance reduction due to > OpenMPI v 1.3.2 forcing all MPI traffic over Ethernet instead > of using Infiniband > > Hi Jim, list > > Have you checked if configure caught your IB libraries properly? > IIRR there has been some changes since 1.2.8 on how configure > searches for libraries (e.g. finding libnuma was a problem, > now fixed). > Chances are that if you used some old script or command line > to run configure, it may not have worked as you expected. > > Check the output of ompi_info -config. > It should show -lrdmacm -libverbs, otherwise it skipped IB. > In this case you can reconfigure, pointing to the IB library location. > > If you have a log of your configure step you can also search > it for openib, libverbs, etc, to see if it did what you expected. > > I hope this helps, > Gus Correa > --------------------------------------------------------------------- > Gustavo Correa > Lamont-Doherty Earth Observatory - Columbia University > Palisades, NY, 10964-8000 - USA > --------------------------------------------------------------------- > > > Pavel Shamis (Pasha) wrote: > > Jim, > > Can you please share with us you mca conf file. > > > > Pasha. > > Jim Kress ORG wrote: > >> For the app I am using, ORCA (a Quantum Chemistry > program), when it > >> was compiled using openMPI 1.2.8 and run under 1.2.8 with the > >> following in the openmpi-mca-params.conf file: > >> > >> btl=self,openib > >> > >> the app ran fine with no traffic over my Ethernet network and all > >> traffic over my Infiniband network. > >> > >> However, now that ORCA has been recompiled with openMPI v1.3.2 and > >> run under 1.3.2 (using the same openmpi-mca-params.conf file), the > >> performance has been reduced by 50% and all the MPI > traffic is going > >> over the Ethernet network. > >> > >> As a matter of fact, the openMPI v1.3.2 performance now > looks exactly > >> like the performance I get if I use MPICH 1.2.7. > >> > >> Anyone have any ideas: > >> > >> 1) How could this have happened? > >> > >> 2) How can I fix it? > >> > >> a 50% reduction in performance is just not acceptable. Ideas/ > >> suggestions would be appreciated. > >> > >> Jim > >> > >> _______________________________________________ > >> users mailing list > >> us...@open-mpi.org > >> http://www.open-mpi.org/mailman/listinfo.cgi/users > >> > >> > > > > _______________________________________________ > > users mailing list > > us...@open-mpi.org > > http://www.open-mpi.org/mailman/listinfo.cgi/users > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users
