pNetCDF hanging writing output from WRF

[John Michalakes]

All clear. Coding error on my part was causing the hangup. -John

> -----Original Message-----
> From: owner-parallel-netcdf at mcs.anl.gov
> [mailto:owner-parallel-netcdf at mcs.anl.gov]On Behalf Of John Michalakes
> Sent: Wednesday, October 25, 2006 12:47 PM
> To: parallel-netcdf at mcs.anl.gov
> Subject: pNetCDF hanging writing output from WRF
>
>
> Using a first-cut implementation of pNetCDF in WRF, I'm attempting to run
> and write history from 4 MPI processes on an IBM Power5+ system,
> using GPFS.
> The code is calling NFMPI_PUT_VARA_<type>_ALL routines for each output
> field, and it seems to work well until it gets to writing the 221st of 235
> fields at which point two processes (0 and 1) hang on a call to
> MPI_File_set_view down in set_vara_fileview (mpinetcdf.c).  The other two
> processes finish the sequence of writes to the WRF output file
> and go to the
> next phase of the computation.  The code will stay hung this way until
> killed.
>
> The fields being output are a mix of integer and real, and a mix of
> dimensions (3, 2, 1, and 0 dimensional).
>
> I've checked the sequence of calls to the pNetCDF layer and they match up
> field-for-field on all four processes and they all match up.
>
> Almost certainly this is a goof on my part, but any pointers where to look
> next will be much appreciated.
>
> Thanks,
>
> John
>
> -----------------------------------------------------------
> John Michalakes, Software Engineer        michalak at ucar.edu
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>