I assume you a referring to the openmpi-mca-params.conf file As I indicated previously, my first run was with the line
btl=self,openib As the only entry in the openmpi-mca-params.conf file. This my default setting and was what I used, and it worked well, for v 1.2.8 Then I tried btl=self,openib mpi_yield_when_idle=0 As the only entries in the openmpi-mca-params.conf file. No difference in the results. Then I tried btl=self,openib mpi_yield_when_idle=0 As the only entries in the openmpi-mca-params.conf file and also set the environment variable OMPI_MCA_mpi_leave_pinned=0 No difference in the results. What else can I provide? By the way, did you read the message where I retracted my assumption about MPI traffic being forced over Ethernet? Jim > -----Original Message----- > From: users-boun...@open-mpi.org > [mailto:users-boun...@open-mpi.org] On Behalf Of Pavel Shamis (Pasha) > Sent: Tuesday, June 23, 2009 7:24 AM > 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 > > 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
