[Llvm-bgq-discuss] Details behind MPI wrapper for bgclang++

[Jack Poulson]

Hi Jeff,

Yes, this is on Vesta. There doesn't seem to be anything in your .soft file
different from mine, other than you specifying the Nov 2012 IBM compilers.

Is it possible for me to browse through the current source for the BGQ
MPICH modifications?

Jack

On Fri, Mar 1, 2013 at 10:30 AM, Jeff Hammond <jhammond at alcf.anl.gov> wrote:

> This is BGQ @ ALCF, right?  Might be MPI calls inside of Darshan.  I
> disable it because of issues like this.
>
> I think my ~/.soft is world-readable.  Use the @mpi-wrappers script
> and try to verify that you aren't getting Darshan in your build.
>
> Jeff
>
> On Fri, Mar 1, 2013 at 11:16 AM, Jack Poulson <jack.poulson at gmail.com>
> wrote:
> > On Thu, Feb 28, 2013 at 10:15 PM, Hal Finkel <hfinkel at anl.gov> wrote:
> >>
> >>
> >> Not a problem! Thanks for being a beta tester :) I've updated the
> >> installed libc++ libraries to use CLOCK_REALTIME instead of
> CLOCK_MONOTONIC.
> >> Please try again.
> >>
> >>  -Hal
> >>
> >
> > One more problem taken care of it seems. Unfortunately my program now
> > segfaults in an MPI_Gather call (and the trace still seems a bit
> corrupted,
> > see core.13). There is really only one instance in my program where
> > MPI_Gather is called, and it looks like this:
> >
> > vector<int> myCoords(d), coords(1);
> > // <fill myCoords here>
> > if( commRank == 0 )
> >     coords.resize( d*commSize );
> > MPI_Gather( &myCoords[0], d, MPI_INT, &coords[0], d, MPI_INT, 0, comm );
> >
> > In the above snippet, 'd' is the dimension of the domain, which is two
> for
> > the executable in question, and space for storing every process's
> > coordinates is only allocated on the root process. This is pretty
> > straightforward MPI in my opinion, so I am skeptical that I have a bug
> here.
> >
> > Jack
>
>
>
> --
> Jeff Hammond
> Argonne Leadership Computing Facility
> University of Chicago Computation Institute
> jhammond at alcf.anl.gov / (630) 252-5381
> http://www.linkedin.com/in/jeffhammond
> https://wiki.alcf.anl.gov/parts/index.php/User:Jhammond
>
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