On 05/22/2013 11:33 AM, Tom Rosmond wrote:
Thanks for the confirmation of the MPIIO problem. Interestingly, we
have the same problem when using MPIIO in INTEL MPI. So something
fundamental seems to be wrong.
I think but I am not sure that it is because the MPI I/O (ROMIO) code is
the same for all distributions...
It has been written by Rob Latham.
Maybe some developers could confirm this?
Eric
T. Rosmond
On Wed, 2013-05-22 at 11:21 -0400, Eric Chamberland wrote:
I have experienced the same problem.. and worst, I have discovered a bug
in MPI I/O...
look here:
http://trac.mpich.org/projects/mpich/ticket/1742
and here:
http://www.open-mpi.org/community/lists/users/2012/10/20511.php
Eric
On 05/21/2013 03:18 PM, Tom Rosmond wrote:
Hello:
A colleague and I are running an atmospheric ensemble data assimilation
system using MPIIO. We find that if for an individual
MPI_FILE_READ_AT_ALL the block of data read exceeds 2**31 elements, the
program fails. Our application is 32 bit fortran (Intel), so we
certainly can see why this might be expected. Is this the case? We
have a workaround by doing multiple reads from the file while moving the
file view, so it isn't a serious problem.
Thanks for any advice or suggestions
T. Rosmond
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