Thank you to everybody for suggestions and comments. I have used relatively small number of nodes (4400). It looks like that the main issue that I didn't disable dynamic components opening in my openmpi build while keeping MPI installation directory on network file system. Oh my god!
I didn't check suggestion about using debrujin routed component yet. -Andrei -----Original Message----- From: users-boun...@open-mpi.org [mailto:users-boun...@open-mpi.org] On Behalf Of Ralph Castain Sent: Tuesday, April 23, 2013 10:07 PM To: Open MPI Users Subject: Re: [OMPI users] OpenMPI at scale on Cray XK7 On Apr 23, 2013, at 10:45 AM, Nathan Hjelm <hje...@lanl.gov> wrote: > On Tue, Apr 23, 2013 at 10:17:46AM -0700, Ralph Castain wrote: >> >> On Apr 23, 2013, at 10:09 AM, Nathan Hjelm <hje...@lanl.gov> wrote: >> >>> On Tue, Apr 23, 2013 at 12:21:49PM +0400, ???????????????????? ???????????? wrote: >>>> Hi, >>>> >>>> Nathan, could you please advise what is expected startup time for >>>> OpenMPI job at such scale (128K ranks)? I'm interesting in >>>> 1) time from mpirun start to completion of MPI_Init() >>> >>> It takes less than a minute to run: >>> >>> mpirun -n 131072 /bin/true >>> >>> >>>> 2) time from MPI_Init() start to completion of MPI_Init() >>> >>> A simple MPI application took about about 1.25 mins to run. If you want to see our setup you can take a look at contrib/platform/lanl/cray_xe6. >>> >>>>> From my experience for 52800 rank job >>>> 1) took around 20 min >>>> 2) took around 12 min >>>> that actually looks like a hung. >>> >>> How many nodes? I have never seen launch times that bad on Cielo. You could try adding -mca routed debruijn -novm and see if that helps. It will reduce the amount of communication between compute nodes and the login node. >> >> I believe the debrujin module was turned off a while ago due to a bug >> that wasn't fixed. However, try using > > Was it turned off or was the priority lowered? If it was lowered then -mca routed debruijn should work. The -novm is to avoid the bug (as I understand it). I am working on fixing the bug now in hope it will be ready for 1.7.2. Pretty sure it is ompi_ignored and thus, not in the tarball > > -Nathan > _______________________________________________ > 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
