I'm currently running MPI (5.03.048) on Windows 10 (64 bit) 8 core machine with 32GB RAM. I am using MPI_COMM_SPAWN from a C++ app (that is launched using mpiexec.exe -localonly -n 1) to spawn N MPI workers - actually, I call MPI_COMM_SPAWN N times each for a single worker (FT pattern). If I try to spawn 21 or more workers, I often get a crash from the MPI library itself. This is not consistent i.e. sometimes I can spawn 32 workers with no problems, sometimes I get a problem with 21. Has anyone else come across such a problem? Can anyone suggest what the issue might be?
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