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Subject: [OMPI devel] Bug in return status of MPI_WAIT()
From: Katz, Jacob (jacob.katz_at_[hidden])
Date: 2009-05-12 06:21:57

Fwd'ing to devel list as a bug report...
Jacob M. Katz | jacob.katz_at_[hidden]<mailto:jacob.katz_at_[hidden]> | Work: +972-4-865-5726 | iNet: (8)-465-5726

From: users-bounces_at_[hidden] [mailto:users-bounces_at_[hidden]] On Behalf Of Katz, Jacob
Sent: Sunday, May 10, 2009 12:52
To: Open MPI Users
Subject: [OMPI users] Bug in return status of MPI_WAIT()?

While trying error-related functionality of OMPI, I came across a situation where when I use MPI_ERRORS_RETURN error handler, the errors do not come out correctly from WAIT calls.
The program below correctly terminates with a fatal "message truncated" error, but when the line setting the error handler to MPI_ERRORS_RETURN is uncommented, it silently completes. I expected the print out that checks the status after WAIT call to be executed, but it wasn't.
The issue didn't happen when using blocking recv.

A bug or my incorrect usage?


// mpic++ -o test test.cpp
// mpirun -np2 ./test
#include "mpi.h"
#include <iostream>
using namespace std;

int main (int argc, char *argv[])
    int rank;
    char buf[100] = "hmmmm";
    MPI::Status stat;

    MPI::Init(argc, argv);
    rank = MPI::COMM_WORLD.Get_rank();


    if (rank == 0)
        MPI::Request r = MPI::COMM_WORLD.Irecv(buf, 1, MPI_CHAR, MPI::ANY_SOURCE, MPI::ANY_TAG);
        if (stat.Get_error() != MPI::SUCCESS)
            cout << "0: Error during recv" << endl;
        MPI::COMM_WORLD.Send(buf, 2, MPI_CHAR, 0, 0);

    return (0);

Jacob M. Katz | jacob.katz_at_[hidden]<mailto:jacob.katz_at_[hidden]> | Work: +972-4-865-5726 | iNet: (8)-465-5726

Intel Israel (74) Limited

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