It turned out I was using development version 1.5.0. After going back
to the release version, I found that there was another problem on my
end, which had nothing to do with OpenMPI. So thanks for the help; all
is well. (And sorry for the belated reply.)
Ralph Castain wrote:
After digging around a little, I found that you must be using the OMPI devel
trunk as no release version contains this code. I also looked to see why it was
done, and found that the concern was with an inadvertent sigpipe that can occur
internal to OMPI due to a race condition.
So I modified the trunk a little. We will ignore the first few sigpipe errors
we get, but will then abort with an appropriate error.
HTH
Ralph
On Nov 24, 2010, at 5:08 PM, Jesse Ziser wrote:
Hello,
I've noticed that OpenMPI does not seem to detect when something downstream of
it fails. Specifically, I think it does not handle SIGPIPE or pass it down to
its young, but it still prints an error message every time it occurs.
For example, running a command like this:
mpirun -np 1 ./mpi-cat </dev/zero | dd bs=1 count=1 >/dev/null
(where mpi-cat is just a simple program that initializes MPI and then copies
its input to its output) hangs after the dd quits, and produces an eternity of
repetitions of this error message:
[[35845,0],0] reports a SIGPIPE error on fd 13
I am unsure whether this is the intended behavior, but it certainly seems
unfortunate from my persepective. Is there any way to make it exit nicely,
preferably with a single error, whenever what it's trying to write to doesn't
exist anymore? I think I could even submit a patch to make it quit on SIGPIPE,
if it is agreed that that makes sense.
Here's the source for my mpi-cat example:
#include <stdio.h>
#include <mpi.h>
int main (int iArgC, char *apArgV [])
{
int iRank;
MPI_Init (&iArgC, &apArgV);
MPI_Comm_rank (MPI_COMM_WORLD, &iRank);
if (iRank == 0)
{
while(1)
if(putchar(getchar()) < 0)
break;
}
MPI_Finalize ();
return (0);
}
Thank you,
Jesse Ziser
Applied Research Laboratories:
The University of Texas at Austin
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