On Jul 27, 2010, at 4:19 PM, Gus Correa wrote:
> Is there a simple way to check the number of bytes associated to each
> MPI basic type of OpenMPI on a specific machine (or machine+compiler)?
>
> Something that would come out easily, say, from ompi_info?
Not via ompi_info, but the MPI function MPI_GET_EXTENT will tell you the datatype's size.
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[4:54] svbu-mpi:~/mpi % cat extent.f90
program main
use mpi
implicit none
integer ierr, ext
call MPI_INIT(ierr)
call MPI_TYPE_EXTENT(MPI_DOUBLE_PRECISION, ext, ierr)
print *, 'Type extent of DOUBLE_PREC is', ext
call MPI_FINALIZE(ierr)
end
[4:54] svbu-mpi:~/mpi % mpif90 extent.f90 -o extent -g
[4:54] svbu-mpi:~/mpi % ./extent
Type extent of DOUBLE_PREC is 8
[4:54] svbu-mpi:~/mpi %
-----
--
Jeff Squyres
jsquyres_at_[hidden]
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