[MPICH] Initializing MPICH2

Rajeev Thakur thakur at mcs.anl.gov
Thu Jul 20 14:03:06 CDT 2006

MPI-2 has a feature called Singleton MPI_Init by which a process that was
not started as an MPI job can become an MPI process by calling MPI_Init.
However, the size of MPI_COMM_WORLD will be 1; that is, any number of
processes can call MPI_Init, but each will get its own comm_world of size 1.


> -----Original Message-----
> From: owner-mpich-discuss at mcs.anl.gov 
> [mailto:owner-mpich-discuss at mcs.anl.gov] On Behalf Of Steve Angelovich
> Sent: Thursday, July 20, 2006 12:00 PM
> To: mpich-discuss at mcs.anl.gov
> Subject: [MPICH] Initializing MPICH2
> All,
> Is it possible to initialize mpich2 if the application has not been 
> started via mpiexec? I know the size of the group and the 
> rank of each exec.
> I thought I read something about how to do this to help with 
> debugging 
> but I can't find the document anymore.
> Thanks,
> Steve
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