On 27 August 2014 02:38, Jeff Squyres (jsquyres) <[email protected]> wrote:
> If you have reproducers, yes, that would be most helpful -- thanks.
>
OK, here you have something to start. To be fair, this is a reduction
with zero count. I have many other tests for reductions with zero
count that are failing.
Does Open MPI ban zero-count reduction calls, or any failure is actually a bug?
$ cat ireduce_scatter_block.c
#include <mpi.h>
int main(int argc, char *argv[])
{
MPI_Request request;
MPI_Init(&argc, &argv);
MPI_Ireduce_scatter_block(NULL, NULL, 0, MPI_INT,
MPI_SUM, MPI_COMM_SELF, &request);
MPI_Wait(&request, MPI_STATUS_IGNORE);
MPI_Finalize();
return 0;
}
$ mpicc ireduce_scatter_block.c
$ ./a.out
malloc debug: Request for 0 bytes (coll_libnbc_ireduce_scatter_block.c, 67)
