Wouldn't you save yourself work and your users confusion if you disabled options that don't currently work?
Jeffrey A. Cummings Engineering Specialist Performance Modeling and Analysis Department Systems Analysis and Simulation Subdivision Systems Engineering Division Engineering and Technology Group The Aerospace Corporation 571-307-4220 jeffrey.a.cummi...@aero.org From: Ralph Castain <r...@open-mpi.org> To: Open MPI Users <us...@open-mpi.org>, List-Post: users@lists.open-mpi.org Date: 04/25/2014 05:40 PM Subject: Re: [OMPI users] Deadlocks and warnings from libevent when using MPI_THREAD_MULTIPLE Sent by: "users" <users-boun...@open-mpi.org> We don't fully support THREAD_MULTIPLE, and most definitely not when using IB. We are planning on extending that coverage in the 1.9 series On Apr 25, 2014, at 2:22 PM, Markus Wittmann <markus.wittm...@fau.de> wrote: > Hi everyone, > > I'm using the current Open MPI 1.8.1 release and observe > non-deterministic deadlocks and warnings from libevent when using > MPI_THREAD_MULTIPLE. Open MPI has been configured with > --enable-mpi-thread-multiple --with-tm --with-verbs (see attached > config.log) > > Attached is a sample application that spawns a thread for each process > after MPI_Init_thread has been called. The thread then calls MPI_Recv > which blocks until the matching MPI_Send is called just before > MPI_Finalize is called in the main thread. (AFAIK MPICH uses such kind > of facility to implement a progress thread) Meanwhile the main thread > exchanges data with its right/left neighbor via ISend/IRecv. > > I only see this, when the MPI processes run on separate nodes like in > the following: > > $ mpiexec -n 2 -map-by node ./test > [0] isend/irecv. > [0] progress thread... > [0] waitall. > [warn] opal_libevent2021_event_base_loop: reentrant invocation. Only one event_base_loop can run on each event_base at once. > [1] isend/irecv. > [1] progress thread... > [1] waitall. > [warn] opal_libevent2021_event_base_loop: reentrant invocation. Only one event_base_loop can run on each event_base at once. > > <no further output...> > > Can anybody confirm this? > > Best regards, > Markus > > -- > Markus Wittmann, HPC Services > Friedrich-Alexander-Universität Erlangen-Nürnberg > Regionales Rechenzentrum Erlangen (RRZE) > Martensstrasse 1, 91058 Erlangen, Germany > http://www.rrze.fau.de/hpc/ > <info.tar.bz2><test.c>_______________________________________________ > 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
