Hi Juraj, Although MPI infrastructure may technically support forking, it's known that not all system resources can correctly replicate themselves to forked process. For example, forking inside MPI program with active CUDA driver will result into crash.
Why not to compile down the MATLAB into a native library and link it with the MPI application directly? E.g. like here: https://www.mathworks.com/matlabcentral/answers/98867-how-do-i-create-a-c-shared-library-from-mex-files-using-the-matlab-compiler?requestedDomain=www.mathworks.com Kind regards, - Dmitry Mikushin. 2016-10-05 11:32 GMT+03:00 juraj2...@gmail.com <juraj2...@gmail.com>: > Hello, > > I have an application in C++(main.cpp) that is launched with multiple > processes via mpirun. Master process calls matlab via system('matlab > -nosplash -nodisplay -nojvm -nodesktop -r "interface"'), which executes > simple script interface.m that calls mexFunction (mexsolve.cpp) from which > I try to set up communication with the rest of the processes launched at > the beginning together with the master process. When I run the application > as listed below on two different machines I experience: > > 1) crash at MPI_Init() in the mexFunction() on cluster machine with > Linux 4.4.0-22-generic > > 2) error in MPI_Send() shown below on local machine with > Linux 3.10.0-229.el7.x86_64 > [archimedes:31962] shmem: mmap: an error occurred while determining > whether or not > /tmp/openmpi-sessions-1007@archimedes_0/58444/1/shared_mem_pool.archimedes > could be created. > [archimedes:31962] create_and_attach: unable to create shared memory BTL > coordinating structure :: size 134217728 > [archimedes:31962] shmem: mmap: an error occurred while determining > whether or not /tmp/openmpi-sessions-1007@arc > himedes_0/58444/1/0/vader_segment.archimedes.0 could be created. > [archimedes][[58444,1],0][../../../../../opal/mca/btl/tcp/bt > l_tcp_endpoint.c:800:mca_btl_tcp_endpoint_complete_connect] connect() to > <MY_IP> failed: Connection refused (111) > > I launch application as following: > mpirun --mca mpi_warn_on_fork 0 --mca btl_openib_want_fork_support 1 -np > 2 -npernode 1 ./main > > I have openmpi-2.0.1 configured with --prefix=${INSTALLDIR} > --enable-mpi-fortran=all --with-pmi --disable-dlopen > > For more details, the code is here: https://github.com/goghino/matlabMpiC > > Thanks for any suggestions! > > Juraj > > _______________________________________________ > users mailing list > users@lists.open-mpi.org > https://rfd.newmexicoconsortium.org/mailman/listinfo/users >
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