On Tue, Apr 24, 2012 at 7:19 AM, Jed Brown <jedbrown at mcs.anl.gov> wrote:
> On Tue, Apr 24, 2012 at 07:15, Matthew Knepley <knepley at gmail.com> wrote: > >> Of course don't fix it. Who do these guys work for, Sandia? > > > They could fix it as an extension in MPICH2, but it would have to be added > to the standard for us to rely on it. Considering that we still can't use > anything past MPI-1.1, we won't be able to remove the hacks for a long > time. This is not to say that it isn't worth fixing, just that your > daughter will be in college by the time the fix can be assumed by callers. > Why not just cast the std::complex<double>* buffer into a a double* buffer of twice the length and use MPI_SUM for the MPI_DOUBLE datatype? I have always found MPI's support for complex datatypes to be hopelessly buggy, so I play these tricks whenever possible. Is this what PETSc currently does for complex MPI_SUM? Jack -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-dev/attachments/20120424/d3114877/attachment.html>
