This issue was just recently discussed on this list -- check out the
thread here:
http://www.open-mpi.org/community/lists/users/2007/05/3323.php
On Jun 5, 2007, at 6:52 PM, smai...@ksu.edu wrote:
Hi,
I am trying a program in which I have 2 MPI nodes and each MPI node
has
2 threads:
Main node-thread Receive Thread
----------------- ----------------
MPI_Init_Thread(MPI_THREAD_MULTIPLE);
.
.
LOOP: LOOP:
THREAD-BARRIER THREAD-BARRIER
MPI_Send(); MPI_Recv();
goto LOOP; goto LOOP;
.
.
The thread-barrier ensures that the 2 threads complete the previous
iteration before moving ahead with this one.
I get the following error SOMETIMES (while sometimes the program runs
properly):
*** An error occurred in MPI_Recv
*** on communicator MPI_COMM_WORLD
*** MPI_ERR_TRUNCATE: message truncated
*** MPI_ERRORS_ARE_FATAL (goodbye)
Somewhere I read that MPI_THREAD_MULTIPLE is not properly tested with
OpenMPI. Can someone tell me whether I am making some mistake or is
there any bug with MPI_THREAD_MULTIPLE?
-Thanks and Regards,
Sarang.
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Jeff Squyres
Cisco Systems
