On Tue, 2010-07-27 at 16:19 -0400, Gus Correa wrote: > Hi Hugo, David, Jeff, Terry, Anton, list > > I suppose maybe we're guessing that somehow on Hugo's iMac > MPI_DOUBLE_PRECISION may not have as many bytes as dp = kind(1.d0), > hence the segmentation fault on MPI_Allreduce. > > Question: > > 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?
bit_size() will give you the integer size. For reals, digits() will give you a hint, but the Fortran real data model is designed to not tie you to a particular representation (my interpretation), so there's no language feature to give a simple word size.
