Re: [OMPI users] OpenMPI runtime-specific environment variable?

> -Original Message- > From: users-boun...@open-mpi.org > [mailto:users-boun...@open-mpi.org] On Behalf Of Ralph Castain > Sent: Wednesday, October 22, 2008 8:02 AM > To: Open MPI Users > Subject: Re: [OMPI users] OpenMPI runtime-specific > environment variable? > > What I think Brian is tr

Re: [OMPI users] Performance: MPICH2 vs OpenMPI

Sangamesh B wrote: I reinstalled all softwares with -O3 optimization. Following are the performance numbers for a 4 process job on a single node: MPICH2: 26 m 54 s OpenMPI: 24 m 39 s I'm not sure I'm following. OMPI is faster here, but is that a result of MPICH2 slowing down? The or

Re: [OMPI users] Crashes over TCP/ethernet but not on shared memory

Resuscitating this thread... Well, we spent some time testing the various options, and Leonardo's suggestion seems to work! We disabled TCP Segment Offloading on the e1000 NICs using "ethtool -K eth tso off" and this type of crash no longer happens. I hope this message can help anyone else exper