[mpich-discuss] Overflow in MPI_Aint

[Christina Patrick]

Hi Pavan,

I ran the command

$ getconf | grep -i WORD
WORD_BIT=32

So I guess it is a 32 bit system.

Thanks and Regards,
Christina.

On Fri, Jul 17, 2009 at 8:06 PM, Pavan Balaji<balaji at mcs.anl.gov> wrote:
>
> 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
>