I swear that there was an MPI-3 proposal for just about exactly this issue (because there is currently no MPI-standardized way to get this information).
I honestly don't remember what happened to this proposal, but I know who made it (Adam Moody, from Livermore). I've just pinged him off list to find out what happened to that proposal. Stay tuned... On Aug 10, 2012, at 1:50 PM, Frank Kampe wrote: > OK. I think I am not being clear and am using the wrong terms. For example, > suppose we launch and MPMD job: > > mpirun -np 1 a.out : -np 8 a.out2 : -np 512 a.out3 > > There are three "instances" invoked here---that's info item(1). In other > words, how many executables are started. Given MPMD mode, the entire set of > apps belong to the same MPI_COMM_WORLD. So, MPI Task 0 is the MPI rank of the > process executing a.out, MPI Task 1 is the 1st MPI rank for process(s) > executing a.out2, and Task 9 is the 1st MPI rank for processes(s) executing > a.out3. That's the info in item (2) below. Finally number of tasks for > instance 1 is 1, for instance 2 is 8, and for instance 3 is 512---that's item > (3). > > What user-callable interface does OpenMPI provide to get that information in > a.out, a.out2, and a.out3 during run-time? > > Thanks. > > ________________________________________ > From: users-boun...@open-mpi.org [users-boun...@open-mpi.org] on behalf of > Ralph Castain [r...@open-mpi.org] > Sent: Friday, August 10, 2012 12:00 PM > To: Open MPI Users > Subject: Re: [OMPI users] User Interface for MPMD > > I gather you don't want to use the MPI calls to get it? Perhaps it would help > if we understood a little more about what you are trying to do. > > Or maybe we just aren't understanding the term "instance" - e.g., for #1, you > want to know how many processes are executing in the job, yes? > > If that's correct, then the second question doesn't make sense to me - so I'm > a little lost. > > > On Aug 10, 2012, at 9:49 AM, Frank Kampe <u2...@cray.com> wrote: > >> No. I am looking for a user-callable function that will return information >> about the running OpenMPI MPMD program from within the running program---the >> information listed below in (1) -- (3). >> >> ________________________________________ >> From: users-boun...@open-mpi.org [users-boun...@open-mpi.org] on behalf of >> Ralph Castain [r...@open-mpi.org] >> Sent: Friday, August 10, 2012 11:15 AM >> To: Open MPI Users >> Subject: Re: [OMPI users] User Interface for MPMD >> >> I'm actually not sure I understand the question - are you talking about a >> programmatic API where an application wants to spawn an MPI program? Or an >> inter-program communication API that wants to tell another program some >> information? Or an API by which the app can tell MPI "I'm going to spawn N >> threads"? Or...? >> >> >> On Aug 10, 2012, at 9:00 AM, Gus Correa <g...@ldeo.columbia.edu> wrote: >> >>> On 08/10/2012 11:31 AM, Frank Kampe wrote: >>>> Are there any user level APIs to provide the following information to a >>>> running OpenMPI MPMD program: >>>> >>>> (1) Number of executable instances >>>> >>>> (2) 1st MPI Task rank of each instance >>>> >>>> (3) Number of MPI Tasks per instance >>>> >>>> Thank You >>>> >>>> >>>> >>>> _______________________________________________ >>>> users mailing list >>>> us...@open-mpi.org >>>> http://www.open-mpi.org/mailman/listinfo.cgi/users >>> Hi Frank >>> Check 'man mpiexec', the --app file option, maybe also --rankfile. >>> The on process binding at the end may also help. >>> I hope this helps, >>> Gus Correa >>> _______________________________________________ >>> 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 -- Jeff Squyres jsquy...@cisco.com For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/
