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
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