Re: [netcdfgroup] bug in nc_open_par?

• To: netcdfgroup@xxxxxxxxxxxxxxxx
• Subject: Re: [netcdfgroup] bug in nc_open_par?
• From: Dennis Heimbigner <dmh@xxxxxxxxxxxxxxxx>
• Date: Wed, 12 Feb 2014 10:39:32 -0700

Two questions:
1. what ./configure flags are you using?
2. what version of netcdf are you using?
=Dennis Heimbigner
 Unidata

Jim Edwards wrote:

I have a very simple unit test that is failing when I try to use netcdf4
parallel.   The test creates a file, calls enddef, closes the file, then
trys to reopen it.   Using netcdf 4.3.0 built with hdf5 1.8.11 I am getting
an assert error when I run this test,
   3:testnetcdf4: nc4file.c:2858: NC4_open: Assertion `0' failed.
   0:testnetcdf4: nc4file.c:2858: NC4_open: Assertion `0' failed.
   1:testnetcdf4: nc4file.c:2858: NC4_open: Assertion `0' failed.
   2:testnetcdf4: nc4file.c:2858: NC4_open: Assertion `0' failed.

The same test written in F90 instead of C passes.

#include <netcdf.h>
#include <mpi.h>
#include <netcdf_par.h>

int main( int *argc, char ***argv)
{
  int mype, npe;
  int fh, ierr;
  MPI_Init(argc,argv);
  MPI_Comm_size(MPI_COMM_WORLD, &npe);
  MPI_Comm_rank(MPI_COMM_WORLD, &mype);

  ierr = nc_create_par("try.nc",NC_MPIIO, MPI_COMM_WORLD, MPI_INFO_NULL,
&fh);
  printf("%d %d\n",__LINE__,ierr);
  ierr = nc_enddef(fh);
  printf("%d %d\n",__LINE__,ierr);
  ierr = nc_close(fh);
  printf("%d %d\n",__LINE__,ierr);

  ierr = nc_open_par("try.nc",NC_MPIIO, MPI_COMM_WORLD, MPI_INFO_NULL, &fh);
  printf("%d %d\n",__LINE__,ierr);
  ierr = nc_close(fh);
  printf("%d %d\n",__LINE__,ierr);

  MPI_Finalize();
}






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    • From: Jim Edwards