pNetCDF and OpenMP?

[Jim Edwards]

We run pnetcdf in a hybrid environment in cesm, we have not used the
particular combination of intel/openmp but have not noted any problems on
the systems we do use.

Jim

On Mon, Oct 10, 2011 at 10:04 AM, Wei-keng Liao <wkliao at ece.northwestern.edu
> wrote:

> Hi, John,
>
> We have not yet tested pnetcdf under the MPI-OpenMP hybrid programming
> environment.
> Could you please describe more in detailed on how your program makes
> pnetcdf calls?
> Or provide us a sample program that can re-produce the hanging?
> Did you see the same hanging happened when using a different file system?
> Have you tried run one OpenMP thread per MPI process and seen the same
> problem?
>
> Wei-keng
>
>
> On Oct 10, 2011, at 7:17 AM, John Michalakes wrote:
>
> > I'm running into a case where WRF reads and writes through pNetCDF okay
> when compiled and running in MPI-only mode, but hangs when running hybrid
> MPI/OpenMP mode.  This is on a Lustre file system.  Application executable
> is compiled and linked using Intel compilers and OpenMPI.  The system is
> NREL's RedMesa Sun Blade Linux cluster (a part of Sandia's Red Sky:
> http://www.top500.org/system/10188 ).  Are there reports of problems
> combining pNetCDF on Lustre with threaded MPI applications?  Thanks, -John
> >
> > --
> > John Michalakes
> > National Renewable Energy Laboratory
> > 1617 Cole Blvd.
> > Golden, Colorado 80401
> > Phone: 303-275-4297
> > Fax: 303-275-4091
> > http://www.nrel.gov/csc/staff_michalakes.html
> >
>
>


-- 
Jim Edwards

CESM Software Engineering Group
National Center for Atmospheric Research
Boulder, CO
303-497-1842
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