Hi Jeff,
Thanks for your answer!
I changed to MPI_Waitsome. During that, I run into another
        issue:
MPI_Waitsome raises a Segmentation fault, depending on the
        order in which the requests are passed in, if different types of
        requests are used (file and p2p).


        Here is the code:

        
        #include <iostream>

        #include <mpi.h>

        
        int main(int argc, char** argv)

        {

            MPI_Init(&argc, &argv);

        
            int rank;

            MPI_Comm_rank(MPI_COMM_WORLD, &rank);

        
            MPI_Request recv_req;

            int int_buf = 0;

            MPI_Irecv(&int_buf, 1, MPI_INT, MPI_ANY_SOURCE, 0,
        MPI_COMM_WORLD, &recv_req);

        
            MPI_File fh;

            MPI_File_open(MPI_COMM_WORLD, "output", MPI_MODE_CREATE |
        MPI_MODE_RDWR,

                          MPI_INFO_NULL, &fh);

        
            MPI_Request file_req;

            double data = 42;

            MPI_File_iwrite_at(fh, rank*sizeof(double), &data, 1,
        MPI_DOUBLE, &file_req);

        
            //MPI_Request requests[2] = {recv_req, file_req}; // A

            MPI_Request requests[2] = {file_req, recv_req}; // B

            std::cout << rank << ":\twaiting..." <<
        std::endl;

            int completed = 0;

            int indices[2];

            MPI_Status status[2];

            MPI_Waitsome(2, requests, &completed, indices, status);

            // int index = 0;

            // MPI_Waitany(2, requests, &index, MPI_STATUS_IGNORE);

            std::cout << rank << ":\tdone" <<
        std::endl;

            MPI_File_close(&fh);

            MPI_Finalize();

        
            return 0;

        }

        
        Exchanging line B with line A does not raises the fault.

        
        Thanks,

        Nils

      
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Nils-Arne Dreier, M.Sc.
Institute for Computational und Applied Mathematics,
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