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?
> 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:
>> and here:
>> On 05/21/2013 03:18 PM, Tom Rosmond wrote:
>>> 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
>>> users mailing list