Thank you! That also works and is very helpful. -----Original Message----- From: users [mailto:users-boun...@open-mpi.org] On Behalf Of Ralph Castain Sent: Thursday, March 27, 2014 3:03 PM To: Open MPI Users Subject: Re: [OMPI users] Mapping ranks to hosts (from MPI error messages)
Or use --display-map to see the process to node assignments 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
