[petsc-dev] assuming sizeof(PetscInt) <= sizeof(PetscScalar)

Matthew Knepley knepley at gmail.com
Sat Feb 8 17:52:26 CST 2014

On Sat, Feb 8, 2014 at 5:40 PM, Barry Smith <bsmith at mcs.anl.gov> wrote:

>    It appears people have been assuming sizeof(PetscInt) <=
> sizeof(PetscScalar) right and left in the code (to take advantage of
> VecScatter functionality). This is most definitely not true with
> --with-64-bit-indices --with-precision=single
> MatGetBrowsOfAoCols_MPIAIJ
> PCGAMGProlongator_Classical_Standard
> maybe others
> VecScatters are for moving Vec elements around, they are not a replacement
> for MPI calls!
> Please don't do this in the future.

Please please please use PetscSF if you have regular layouts, and
PetscSection for irregular layouts.


>    Barry

What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener
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