[petsc-users] Using PETSc GPU backend

[Mark Adams]

Run with options: -mat_type aijcusparse -vec_type cuda -log_view
-options_left

The last column of the performance data (from -log_view) will be the
percent flops on the GPU. Check that that is > 0.

The end of the output will list the options that were used and options that
were _not_ used (if any). Check that there are no options left.

Mark

On Thu, Jun 29, 2023 at 7:50 PM Ng, Cho-Kuen via petsc-users <
petsc-users at mcs.anl.gov> wrote:

> I installed PETSc on Perlmutter using "spack install petsc+cuda+zoltan" and
> used it by "spack load petsc/fwge6pf". Then I compiled the application
> code (purely CPU code) linking to the petsc package, hoping that I can get
> performance improvement using the petsc GPU backend. However, the timing
> was the same using the same number of MPI tasks with and without GPU
> accelerators. Have I missed something in the process, for example, setting
> up PETSc options at runtime to use the GPU backend?
>
> Thanks,
> Cho
>
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