That sounds great Ralph! Do you have any more details about how the
process rank would be added?
And thanks for the other suggestions from Ashley and Galen. Both
methods look like they would work great, and are probably a little
nicer than my current setup.
-Mark
On Jul 11, 2008, at 9:46 AM, Ralph H Castain wrote:
Adding the ability to tag stdout/err with the process rank is fairly
simple.
We are going to talk about this next week at a design meeting - we
have
several different tagging schemes that people have requested, so we
want to
define a way to meet them all that doesn't create too much ugliness
in the
code.
Will get back to you on this one. Regardless, the earliest version
it could
show up in would be 1.3 (which is a tight question given current
release
plans).
On 6/24/08 9:36 AM, "Ashley Pittman" <apittman@concurrent-
thinking.com>
wrote:
If you are using the openmpi mpirun then you can put the following
in a
wrapper script which will prefix stdout in a manner similar to what
you
appear to want. Simply add the wrapper script before the name of
your
application.
Is this the kind of thing you were aiming for? I'm quite surprised
mpirun doesn't have an option for this actually, it's a fairly common
thing to want.
Ashley Pittman.
#!/bin/sh
$@ | sed "s/^/\[rk:$OMPI_MCA_ns_nds_vpid,sz:
$OMPI_MCA_ns_nds_num_procs
\]/"
On Tue, 2008-06-24 at 11:06 -0400, Mark Dobossy wrote:
Lately I have been doing a great deal of MPI debugging. I have,
on an
occasion or two, fallen into the trap of "Well, that error MUST be
coming from rank X. There is no way it could be coming from any
other
rank..." Then proceeding to debug what's happening at rank X,
only to
find out a few frustrating hours later that rank Y is throwing the
output (I'm sure no one else out there has fallen into this
trap). It
was at that point, I decided to write up some code to automatically
(sort of) output the rank and size of my domain with every
output. I
write mostly in C++, and this is what I came up with:
#include <iostream>
#include <mpi.h>
std::ostream &mpi_info(std::ostream &s) {
int rank, size;
rank = MPI::COMM_WORLD.Get_rank();
size = MPI::COMM_WORLD.Get_size();
s << "[rk:" << rank << ",sz:" << size << "]: ";
return s;
}
Then in my code, I have changed:
std::cerr << "blah" << std::endl;
to:
std::cerr << mpi_info << "blah" << std::endl;
(or cout, or file stream, etc...)
where "blah" is some amazingly informative error message.
Are there other ways people do this? Simpler ways perhaps?
-Mark
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