OMPI version 2.1.0. Should have clarified that initially, sorry. Running on Ubuntu 12.04.5.
On Fri, Apr 28, 2017 at 10:29 AM, r...@open-mpi.org <r...@open-mpi.org> wrote: > What version of OMPI are you using? > > On Apr 28, 2017, at 8:26 AM, Austin Herrema <aherr...@iastate.edu> wrote: > > Hello all, > > I am using mpi4py in an optimization code that iteratively spawns an MPI > analysis code (fortran-based) via "MPI.COMM_SELF.Spawn" (I gather that this > is not an ideal use for comm spawn but I don't have too many other options > at this juncture). I am calling "child_comm.Disconnect()" on the parent > side and "call MPI_COMM_DISCONNECT(parent, ier)" on the child side. > > After a dozen or so iterations, it would appear I am running up against > the system limit for number of open pipes: > > [affogato:05553] [[63653,0],0] ORTE_ERROR_LOG: The system limit on number > of pipes a process can open was reached in file odls_default_module.c at > line 689 > [affogato:05553] [[63653,0],0] usock_peer_send_blocking: send() to socket > 998 failed: Broken pipe (32) > [affogato:05553] [[63653,0],0] ORTE_ERROR_LOG: Unreachable in file > oob_usock_connection.c at line 316 > > From this Stackoverflow post > <http://stackoverflow.com/questions/20698712/mpi4py-close-mpi-spawn> I > have surmised that the opened pipes remain open on mpiexec despite no > longer being used. I know I can increase system limits, but this will only > get me so far as I intend to perform hundreds if not thousands of > iterations. Is there a way to dynamically close the unused pipes on either > the python or fortran side? Also, I've seen the "mca parameter" mentioned > in regards to this topic. I don't fully understand what that is, but will > setting it have an effect on this issue? > > Thank you, > Austin > > -- > *Austin Herrema* > PhD Student | Graduate Research Assistant | Iowa State University > Wind Energy Science, Engineering, and Policy | Mechanical Engineering > _______________________________________________ > users mailing list > users@lists.open-mpi.org > https://rfd.newmexicoconsortium.org/mailman/listinfo/users > > > > _______________________________________________ > users mailing list > users@lists.open-mpi.org > https://rfd.newmexicoconsortium.org/mailman/listinfo/users > -- *Austin Herrema* PhD Student | Graduate Research Assistant | Iowa State University Wind Energy Science, Engineering, and Policy | Mechanical Engineering
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