[mvapich-discuss] MPI_COMM_TYPE_SHARED status ?

[Jian Lin]

Hi, Nicolas,

Thanks for your notes.

We cannot reproduce the issue as you mentioned. Will you please provide
more detailed information?

There is a testing program in the MPICH test suite:
test/mpi/comm/cmsplit_type.c. It invokes MPI_Comm_split_type with an
MPI_COMM_TYPE_SHARED option. Can you reproduce the issue with this
program? By setting MPITEST_VERBOSE=1, this program can print the size
of subcommunicator.

If cmsplit_type runs correctly, can you please send us a small
reproducer that can trigger the problem?

Either you are using cmsplit_type or your own reproducer, please tell
us your configure options of MVAPICH2, and the command-line to
reproduce the issue. 

Thank you!

On Mon, 9 Mar 2015 17:25:10 +0100
Nicolas Niclausse <nicolas.niclausse at inria.fr> wrote:

> Hello
> 
> I'm trying to use MPI_COMM_TYPE_SHARED with MPI_Comm_split_type.
> 
> Everything works fine with mpich 3.1.4 (ie. on two 20 cores nodes,
> the size of each shared communicator is 20);
> 
> However, it doesn't work with mvapich (version 2.1a, because my
> application use Mpi_comm_spawn and this doesn't work in 2.1rc1): My
> shared communicator size is only one.
> 
> Is it supported by mvapich ?
> 



-- 
Jian Lin
http://linjian.org