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Subject: [OMPI users] Bug MPI_Iscatter
From: Pierre Jolivet (jolivet_at_[hidden])
Date: 2013-11-21 17:19:50

The following code doesn’t execute properly :
#include <mpi.h>

int main(int argc, char** argv) {
    int taskid, ntasks;
    MPI_Init(&argc, &argv);
    MPI_Request rq;

    double* r;
    int l = 0;
    if(taskid > 0)
        MPI_Iscatter(NULL, 0, MPI_DATATYPE_NULL, r, l, MPI_DOUBLE, 0, MPI_COMM_WORLD, &rq);

*** An error occurred in MPI_Type_extent
*** MPI_ERR_TYPE: invalid datatype

Hotfix: change MPI_DATATYPE_NULL to something else.

Thanks for a quick fix.