You should not have to recompile openmpi, but you do have to use the correct type. You can check the size of integers in your fortrana nd use MPI_INTEGER4 or MPI_INTEGER8 depending on what you get.
in gfortran use
integer i
if(sizeof(i) .eq. 8) then
mpi_int_type=MPI_INTEGER8
else
mpi_int_type=MPI_INTEGER4
endif
then use mpi_int_type for the type in the calls

On 06/28/12 16:00, William Au wrote:

Hi,

I try to compile my fortran program in linux with gfortran44 using option -fdefault-integer-8,
then all my integer will of kind=8.

My question is what should I do with openmpi? I am using 1.6, should I compile openmpi
with the same options? Will it get the correct size of MPI_INTEGER and MPI_INTEGER2?

Thanks.

Regards,

William
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