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Subject: Re: [OMPI users] MPIIO max record size
From: Eric Chamberland (Eric.Chamberland_at_[hidden])
Date: 2013-05-22 12:23:36


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
>>>
>>>
>>>
>>> _______________________________________________
>>> users mailing list
>>> users_at_[hidden]
>>> http://www.open-mpi.org/mailman/listinfo.cgi/users
>>>
>>