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Subject: [OMPI users] MPI_File_Read_all and large file
From: Gabriele Fatigati (g.fatigati_at_[hidden])
Date: 2011-03-02 12:02:36


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?

Thanks in forward.

-- 
Ing. Gabriele Fatigati
Parallel programmer
CINECA Systems & Tecnologies Department
Supercomputing Group
Via Magnanelli 6/3, Casalecchio di Reno (BO) Italy
www.cineca.it                    Tel:   +39 051 6171722
g.fatigati [AT] cineca.it