Hello Rui, Note there is no standard for the format of the port_name so don’t read much what it looks like when printed out.
Could you provide some more information about your particular setup: - characteristics of the system you are using, e.g. a Linux cluster, laptop running os-x, etc. - what version of Open MPI you are using - if possible, the configure options used to build/install Open MPI - the client/server test app (if its concise) Thanks, Howard -- Howard Pritchard HPC-DES Los Alamos National Laboratory From: devel <devel-boun...@lists.open-mpi.org<mailto:devel-boun...@lists.open-mpi.org>> on behalf of Rui Liu <l...@comp.nus.edu.sg<mailto:l...@comp.nus.edu.sg>> Reply-To: Open MPI Developers <devel@lists.open-mpi.org<mailto:devel@lists.open-mpi.org>> Date: Thursday, November 17, 2016 at 6:58 PM To: "devel@lists.open-mpi.org<mailto:devel@lists.open-mpi.org>" <devel@lists.open-mpi.org<mailto:devel@lists.open-mpi.org>> Subject: [OMPI devel] Developing MPI program without mpirun Hi folks, I am working on a simple client/server program but I don’t want to use mpirun to start the program (In nature, I just want to adopt MPI API into my own project but cannot start it using mpirun). I mostly followed the singleton mode of MPI, using APIs like MPI_Open_port, MPI_Comm_connect, and MPI_Comm_accept. But it doesn’t work, especially the port_name is something like 4034413554.0:228712872, which really confuse me. Anyone knows how to achieve that? I attach my server and client key source code for your reference. server side: char myport[MPI_MAX_PORT_NAME]; MPI_Open_port(MPI_INFO_NULL, myport); cout << myport << endl; (assume myport is 4034413554.0:228712872, it always return string like this) MPI_Comm_accept(myport, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &client); MPI_Recv(&number, 1, MPI_INT, MPI_ANY_SOURCE, MPI_ANY_TAG, client, &status); client side: char name[] = "4034413554.0:228712872"; MPI_Comm_connect(name, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &server); int number = -1 ; MPI_Send(&number, 1, MPI_INT, 0, 0, server); Best, Rui
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