[mpich-discuss] Overflow in MPI_Aint

[Pavan Balaji]

Is it a 32-bit system? MPI_Aint is the size of a (void *), so on 32-bit 
systems it's restricted to 2GB.

  -- Pavan

On 07/17/2009 07:04 PM, Christina Patrick wrote:
> Hi Everybody,
> 
> I am trying to create an array 32768 x 32768 x 8 bytes(double) = 8GB
> file using 16 MPI processes. However, everytime, I try doing that, MPI
> aborts. The backtrace is showing me that there is a problem in
> ADIOI_Calc_my_off_len() function. There is a variable there:
> MPI_Aint filetype_extent;
> 
> and the value of the variable is filetype_extent = 0 whenever it executes
> MPI_Type_extent(fd->filetype, &filetype_extent);
> Hence, when it reaches the statement:
>     335             n_filetypes  = (offset - flat_file->indices[0]) /
> filetype_extent;
> I always get SIGFPE. Is there a solution to this problem? Can I create
> such a big file?
> I checked the value of the variable while creating a file of upto 2G
> and it is NOT zero which makes me conclude that there is an overflow
> when I am specifying 8G.
> 
> Thanks and Regards,
> Christina.
> 
> PS: I am using the PVFS2 filesystem with mpich2-1.0.8 and pvfs-2.8.0.

-- 
Pavan Balaji
http://www.mcs.anl.gov/~balaji