[petsc-users] PETSC using 32-bit integers

[Matthew Knepley]

For any performance question, we need to see the output of -log_view for
each case compared.

  Thanks,

    Matt

On Tue, Jun 25, 2019 at 5:55 AM José Lorenzo via petsc-users <
petsc-users at mcs.anl.gov> wrote:

> I have access to two PETSC installations: one using 64-bit integers and
> another one with 32-bit integers. For some reason, when I run the exactly
> same FORTRAN code (except for the size of integer type) using both
> installations, the 32-bit one exhibits much lower performance in terms of
> computation time. This is a problem because I need the 32-bit version in
> order to be able to use the LU factorization provided in MUMPS.
>
> I would appreciate any hint helping me understand why this may happen.
>


-- 
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

https://www.cse.buffalo.edu/~knepley/ <http://www.cse.buffalo.edu/~knepley/>
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