On Mon, Dec 6, 2021 at 7:54 PM Fande Kong <[email protected]> wrote:

Thanks, Matt,

Sorry, I still have more questions on this example. How to refine mesh to make the problem larger?

I tried the following options, and none of them worked. I might do something wrong.

-ex56_dm_refine 9

and

-dm_refine 4

The mesh handling in this example does not conform to the others, but it appears that -ex56_dm_refine <k> should take effect at https://gitlab.com/petsc/petsc/-/blob/main/src/snes/tutorials/ex56.c#L381 unless you are setting max_conv_its to 0 somehow. Thanks, Matt

Thanks,

Fande

On Mon, Dec 6, 2021 at 5:04 PM Matthew Knepley <[email protected]> wrote:

...

On Mon, Dec 6, 2021 at 7:02 PM Fande Kong <[email protected]> wrote:

...

Thanks, Matt

On Mon, Dec 6, 2021 at 4:47 PM Matthew Knepley <[email protected]> wrote:

...

On Mon, Dec 6, 2021 at 6:40 PM Fande Kong <[email protected]> wrote:

...

Dear PETSc team,

I am interested in a careful evaluation of PETSc GPU performance in our INL cluster.

Any example in PETSc that can show GPU speedup with solving a nonlinear equation?

I talked to Junchao; he suggested that I try SNES/tutorial/ex56. I tried that, but I could not find any speedup using the GPU. I could attach some results of "log_view" later if we would like to see that.

We should note that you will only see speedup in the solver, so that problem has to be pretty large. I believe Mark has good results with it. The assembly is still all on the CPU. I am working on this over break, and hope to have a CEED version of it by the new year.

Are both function and matrix assmelies on CPU? Or just the matrix assembly?

There is no GPU assembly right now.

Matt

...

OK, I will try to check the solver part

Thanks, again

Fande

...

Thanks,

Matt

...

Appreciate any instructions/comments about running a simple PETSc GPU example to get a speedup.

Thanks,

Fande

-- 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/>

-- 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/>

-- 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/>