The reproducer is working for me with master on OX 10.10. Some changes to ompi_comm_set went in yesterday. Are you on the latest hash?
-Nathan
On Wed, Sep 16, 2015 at 08:49:59AM -0500, Edgar Gabriel wrote:
> something is borked right now on master in the management of inter vs. intra
> communicators. It looks like intra communicators are wrongly selecting the
> inter coll module thinking that it is an inter communicator, and we have
> hangs because of that. I attach a small replicator, where a bcast of a
> duplicate of MPI_COMM_WORLD hangs, because the inter collective module is
> being selected.
>
> Thanks
> Edgar
> #include <stdio.h>
> #include "mpi.h"
>
> int main( int argc, char *argv[] )
> {
> MPI_Comm comm1;
> int root=0;
> int rank2, size2, global_buf=1;
> int rank, size;
>
> MPI_Init ( &argc, &argv );
>
> MPI_Comm_rank ( MPI_COMM_WORLD, &rank );
> MPI_Comm_size ( MPI_COMM_WORLD, &size );
>
> /* Setting up a new communicator */
> MPI_Comm_dup ( MPI_COMM_WORLD, &comm1 );
>
> MPI_Comm_size ( comm1, &size2 );
> MPI_Comm_rank ( comm1, &rank2 );
>
>
> MPI_Bcast ( &global_buf, 1, MPI_INT, root, MPI_COMM_WORLD );
> if ( rank == root ) {
> printf("Bcast on MPI_COMM_WORLD finished\n");
> }
> MPI_Bcast ( &global_buf, 1, MPI_INT, root, comm1 );
> if ( rank == root ) {
> printf("Bcast on duplicate of MPI_COMM_WORLD finished\n");
> }
>
> MPI_Comm_free ( &comm1 );
>
> MPI_Finalize ();
> return ( 0 );
> }
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> Link to this post:
> http://www.open-mpi.org/community/lists/devel/2015/09/18040.php
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