Ricardo Reis wrote:
On Wed, 2 Mar 2011, Gabriele Fatigati wrote:
Dear OpenMPI users and developers,
i'm using OpenMPI 1.4.3.
My question is about MPI_FIle_Real_all routine and files larger than 4
GB.
Is this routine able to manage this case?
Using the routine with 6 GB file the routine fails, retrieving an
allocation
error. Investigating more in depth with Totalview, the problem appears
in a
line 188 of ompi/mca/io/romio/romio/adio/ad_nfs/ad_nfs_read.c:
MPI_Type_size(fd->filetype, &filetype_size);
here there is an explicit cast to int that can causes the problem.
Someone can help me?
the file size per process must be lower than 4Gb
There was a discussion a short time ago about this...
best,
Ricardo Reis
'Non Serviam'
PhD candidate @ Lasef
Computational Fluid Dynamics, High Performance Computing, Turbulence
http://www.lasef.ist.utl.pt
Cultural Instigator @ Rádio Zero
http://www.radiozero.pt
http://www.flickr.com/photos/rreis/
contacts: gtalk: kyriu...@gmail.com skype: kyriusan
Hello Gabrielle
This thread may help:
http://www.open-mpi.org/community/lists/users/2010/11/14792.php
As Ricardo and Massimo pointed out,
the issue may be the 2GB limitation of (MPI) integers.
There is a workaround suggested on one of the thread's messages,
whereby you use MPI types to reduce the count number
in the message buffer.
I hope this helps,
Gus Correa
