Hi Gilles, thank you so much for your support! For now I'm just testing the software, so it's running on a single node.
Your suggestion was very precise. In fact, choosing the ob1 component leads to a successfull execution! The tcp component had no effect. mpirun --mca pml ob1 —mca btl tcp,self -np 2 ./a.out > Success mpirun --mca pml ob1 -np 2 ./a.out > Success But... our cluster is equiped with Intel OMNI Path interconnects and we are aiming to use psm2 through ofi component in order to take full advantage of this technology. I believe your suggestion is showing that the problem is right here. But unfortunately I cannot see further. Meanwhile, I've also compiled Open MPI 3.1.3 and I have a successfull run with the same options and the same environment (no MPI_Send error). Could Open MPI 4.0.0 bring a different behaviour in this area? Eventually regarding ofi component? Do you have any idea that I could put in practice to narrow the problem further? Regards, Eduardo ps: I've recompiled Open MPI 4.0.0 using --with-hwloc=external, but with no different results (the same MPI_Send error); ps2: Yes, the configure line thing is really fishy, the original line was --prefix=/opt/openmpi/4.0.0 --with-pmix=/usr/lib/x86_64-linux-gnu/pmix --with-libevent=external --with-slurm --enable-mpi-cxx --with-ofi --with-verbs=no --disable-silent-rules --with-hwloc=/usr --enable-mpirun-prefix-by-default --with-devel-headers ________________________________ De : users <users-boun...@lists.open-mpi.org> de la part de gilles.gouaillar...@gmail.com <gilles.gouaillar...@gmail.com> Envoyé : mercredi 9 janvier 2019 15:16 À : Open MPI Users Objet : Re: [OMPI users] Open MPI 4.0.0 - error with MPI_Send Eduardo, The first part of the configure command line is for an install in /usr, but then there is ‘—prefix=/opt/openmpi/4.0.0’ and this is very fishy. You should also use ‘—with-hwloc=external’. How many nodes are you running on and which interconnect are you using ? What if you mpirun —mca pml ob1 —mca btl tcp,self -np 2 ./a.out Cheers, Gilles On Wednesday, January 9, 2019, ROTHE Eduardo - externe <eduardo-externe.ro...@edf.fr<mailto:eduardo-externe.ro...@edf.fr>> wrote: Hi. I'm testing Open MPI 4.0.0 and I'm struggling with a weird behaviour. In a very simple example (very frustrating). I'm having the following error returned by MPI_Send: [gafront4:25692] *** An error occurred in MPI_Send [gafront4:25692] *** reported by process [3152019457,0] [gafront4:25692] *** on communicator MPI_COMM_WORLD [gafront4:25692] *** MPI_ERR_OTHER: known error not in list [gafront4:25692] *** MPI_ERRORS_ARE_FATAL (processes in this communicator will now abort, [gafront4:25692] *** and potentially your MPI job) In the same machine I have other two instalations of Open MPI (2.0.2 and 2.1.2) and they all run successfully this dummy program: #include <stdio.h> #include <mpi.h> int main(int argc, char **argv) { int process; int population; MPI_Init(NULL, NULL); MPI_Comm_rank(MPI_COMM_WORLD, &process); MPI_Comm_size(MPI_COMM_WORLD, &population); printf("Hello World from proccess %d out of %d\n", process, population); int send_number = 10; int recv_number; if (process == 0) { MPI_Send(&send_number, 1, MPI_INT, 1, 0, MPI_COMM_WORLD); printf("This is process 0 reporting::\n"); } else if (process == 1) { MPI_Recv(&recv_number, 1, MPI_INT, 0, 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE); printf("Process 1 received number %d from process 0\n", recv_number); } MPI_Finalize(); return 0; } I'm really upset about recurring to you with this problem. I've been arround it for days now and can't find any good solution. Can you please take a look? I've enabled FI_LOG_LEVEL=Debug to see if I can trap any information that could be of use but unfortunetly with no success. I've also googled a lot, but I don't see where this error message might be pointing at. Specially having two other working versions on the same machine. The thing is that I see no reason why this code shouldn't run. The following is the configure command line, as given by ompi_info. Configure command line: '--build=x86_64-linux-gnu' '--prefix=/usr' '--includedir=${prefix}/include' '--mandir=${prefix}/share/man' '--infodir=${prefix}/share/info' '--sysconfdir=/etc' '--localstatedir=/var' '--disable-silent-rules' '--libdir=${prefix}/lib/x86_64-linux-gnu' '--libexecdir=${prefix}/lib/x86_64-linux-gnu' '--disable-maintainer-mode' '--disable-dependency-tracking' '--prefix=/opt/openmpi/4.0.0' '--with-pmix=/usr/lib/x86_64-linux-gnu/pmix' '--with-libevent=external' '--with-slurm' '--enable-mpi-cxx' '--with-ofi' '--with-verbs=no' '--disable-silent-rules' '--with-hwloc=/usr' '--enable-mpirun-prefix-by-default' '--with-devel-headers' Thank you for your time. Regards, Ed Ce message et toutes les pièces jointes (ci-après le 'Message') sont établis à l'intention exclusive des destinataires et les informations qui y figurent sont strictement confidentielles. 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