Here is a small test case that hits the bug on 1.4.1:
#include <mpi.h>
int arr[1142];
int main(int argc, char** argv) {
int rank, my_size;
MPI_Init(&argc, &argv);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
my_size = (rank == 1) ? 1142 : 1088;
MPI_Bcast(arr, my_size, MPI_INT, 0, MPI_COMM_WORLD);
MPI_Finalize();
return 0;
}
I tried it on 1.5.1, and I get MPI_ERR_TRUNCATE instead, so this might
have already been fixed.
-- Jeremiah Willcock
On Thu, 10 Feb 2011, Jeremiah Willcock wrote:
FYI, I am having trouble finding a small test case that will trigger this on
1.5; I'm either getting deadlocks or MPI_ERR_TRUNCATE, so it could have been
fixed. What are the triggering rules for different broadcast algorithms? It
could be that only certain sizes or only certain BTLs trigger it.
-- Jeremiah Willcock
On Thu, 10 Feb 2011, Jeff Squyres wrote:
Nifty! Yes, I agree that that's a poor error message. It's probably
(unfortunately) being propagated up from the underlying point-to-point
system, where an ERR_IN_STATUS would actually make sense.
I'll file a ticket about this. Thanks for the heads up.
On Feb 9, 2011, at 4:49 PM, Jeremiah Willcock wrote:
On Wed, 9 Feb 2011, Jeremiah Willcock wrote:
I get the following Open MPI error from 1.4.1:
*** An error occurred in MPI_Bcast
*** on communicator MPI COMMUNICATOR 3 SPLIT FROM 0
*** MPI_ERR_IN_STATUS: error code in status
*** MPI_ERRORS_ARE_FATAL (your MPI job will now abort)
(hostname and port removed from each line). There is no MPI_Status
returned by MPI_Bcast, so I don't know what the error is? Is this
something that people have seen before?
For the record, this appears to be caused by specifying inconsistent data
sizes on the different ranks in the broadcast operation. The error
message could still be improved, though.
-- Jeremiah Willcock
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