Dear all,we develop an instrumentation package based on PMPI and we've observed that PMPI_Ibarrier and PMPI_Ibcast invoke regular MPI_Comm_size and MPI_Comm_rank instead to the PMPI symbols (i.e. PMPI_Comm_size and PMPI_Comm_rank) in OpenMPI 1.10.0.
I have attached simple example that demonstrates it when using OpenMPI 1.10.0. The example creates a library (libinstrument) that hooks MPI_Comm_size, MPI_Comm_rank and MPI_Ibarrier. Then, there's a single MPI application that executes MPI_Ibarrier and waits for it. The result when combining this binary with the instrumentation library is the following:
# ~/aplic/openmpi/1.10.0/bin/mpirun -np 1 ./main entering MPI_Ibarrier entering MPI_Comm_rank leaving MPI_Comm_rank entering MPI_Comm_size leaving MPI_Comm_size leaving MPI_Ibarrierwhich shows that MPI_Comm_rank and MPI_Comm_size are invoked within MPI_Ibarrier.
I looked into ompi/mpi/ibarrier.c and ./ompi/mpi/c/profile/pibarrier.c but it wasn't evident to me what might be wrong.
Can anyone check this? And if this could also occur to other MPI3 immediate collectives (MPI_Ireduce, MPI_Iallreduce, MPI_Igather, ...).
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mpi-ibarrier.tar
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