[mvapich-discuss] MPI-IO Inconsistency over Lustre using MVAPICH

[Robert Latham]

On Wed, Mar 04, 2009 at 09:50:16AM -0600, Rajeev Thakur wrote:
> Nathan,
>        Can you check if it works if you add the prefix "ufs:" to the file
> name in all opens?

Two things come to my eye:
- any chance your site will upgrade to lustre 1.6?  1.4 should perform
  *correctly* but very very slowly for you
- You have no error checking for any of your MPI_FILE routines.
  perhaps you omitted them for the sake of this example, but there's a
  chance that the MPI_FILE_* routine is trying to tell you what went
  wrong. 

  Compare the 'ierr' result with MPI_SUCCESS.  if not equal, convert
  the error code to something human readable with MPI_ERROR_STRING 
  http://www.mpi-forum.org/docs/mpi21-report-bw/node186.htm#Node186

Thanks
==rob

-- 
Rob Latham
Mathematics and Computer Science Division    A215 0178 EA2D B059 8CDF
Argonne National Lab, IL USA                 B29D F333 664A 4280 315B