Yes, I noticed that I could not find --display-map in any of the man pages. Intentional?
-----Original Message----- From: users [mailto:users-boun...@open-mpi.org] On Behalf Of Gus Correa Sent: Thursday, March 27, 2014 3:26 PM To: Open MPI Users Subject: Re: [OMPI users] Mapping ranks to hosts (from MPI error messages) On 03/27/2014 03:02 PM, Ralph Castain wrote: > Or use --display-map to see the process to node assignments > Aha! That one was not on my radar. Maybe because somehow I can't find it in the OMPI 1.6.5 mpiexec man page. However, it seems to work with that version also, which is great. (--display-map goes to stdout, whereas -report-bindings goes to stderr, right?) Thanks, Ralph! Gus Correa > Sent from my iPhone > >> On Mar 27, 2014, at 11:47 AM, Gus Correa <g...@ldeo.columbia.edu> wrote: >> >> PS - The (OMPI 1.6.5) mpiexec default is -bind-to-none, in which case >> -report-bindings won't report anything. >> >> So, if you are using the default, >> you can apply Joe Landman's suggestion (or alternatively use the >> MPI_Get_processor_name function, in lieu of uname(&uts); cpu_name = >> uts.nodename; ). >> >> However, many MPI applications benefit from some type of hardware >> binding, maybe yours will do also, and as a bonus -report-bindings will tell >> you where each rank ran. >> mpiexec's -tag-output is also helpful for debugging, but won't tell >> you the node name, just the MPI rank. >> >> You can setup a lot of these things as your preferred defaults, via >> mca parameters, and omit them from the mpiexec command line. >> The trick is to match each mpiexec option to the appropriate mca >> parameter, as the names are not exactly the same. >> "ompi-info --all" may help in that regard. >> See this FAQ: >> http://www.open-mpi.org/faq/?category=tuning#setting-mca-params >> >> Again, the OMPI FAQ page is your friend! :) >> http://www.open-mpi.org/faq/ >> >> I hope this helps, >> Gus Correa >> >>> On 03/27/2014 02:06 PM, Gus Correa wrote: >>> Hi John >>> >>> Take a look at the mpiexec/mpirun options: >>> >>> -report-bindings (this one should report what you want) >>> >>> and maybe also also: >>> >>> -bycore, -bysocket, -bind-to-core, -bind-to-socket, ... >>> >>> and similar, if you want more control on where your MPI processes run. >>> >>> "man mpiexec" is your friend! >>> >>> I hope this helps, >>> Gus Correa >>> >>>> On 03/27/2014 01:53 PM, Sasso, John (GE Power & Water, Non-GE) wrote: >>>> When a piece of software built against OpenMPI fails, I will see an >>>> error referring to the rank of the MPI task which incurred the failure. >>>> For example: >>>> >>>> MPI_ABORT was invoked on rank 1236 in communicator MPI_COMM_WORLD >>>> >>>> with errorcode 1. >>>> >>>> Unfortunately, I do not have access to the software code, just the >>>> installation directory tree for OpenMPI. My question is: Is there >>>> a flag that can be passed to mpirun, or an environment variable >>>> set, which would reveal the mapping of ranks to the hosts they are on? >>>> >>>> I do understand that one could have multiple MPI ranks running on >>>> the same host, but finding a way to determine which rank ran on >>>> what host would go a long way in help troubleshooting problems >>>> which may be central to the host. Thanks! >>>> >>>> --john >>>> >>>> >>>> >>>> _______________________________________________ >>>> 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 > _______________________________________________ > 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
