From: Pascal Proulx <pascal.proulx@cdott.com>
Newsgroups: comp.parallel.mpi
Subject: MPI_Barrier
Date: Mon, 19 Apr 1999 11:06:27 -0400
Organization: Computing Devices Canada
Message-Id: <371B4672.50F3746E@cdott.com>
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Hi,
I run Multiple Code Multiple Data software on a distributed system of
PowerPC using MPI.

I have myglobal communicator (MPI_COMM_WORLD) and another communicator
which is a subset of the global communicator (subsetCommunicator).

Does MPI_Barrier uses subcommunicator MPI_Barrier as a valid barrier?

Ex.

Process A
(...)
MPI_Barrier(MPI_COMM_WORLD);
MPI_Finalize();


Process B and C
(...)
MPI_Barrier(subsetCommunicator); //Is it synchronized with process A
MPI_Barrier call?
//Do some processing
MPI_Barrier(subsetCommunicator);
MPI_Barrier(MPI_COMM_WORLD);
MPI_Finalize();

Is the communicator parameter in MPI_Barrier limited to a specific
communicator space (MPI_COMM_WORLD) or does it include all
sub-communicators (subsetCommunicator)?

Thx,
Pascal Proulx
Software Engineer
Computing Devices Canada
pascal.proulx@cdott.com

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