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

Thanks,

Fande

On Mon, Dec 6, 2021 at 5:04 PM Matthew Knepley <knepley@gmail.com> wrote:

On Mon, Dec 6, 2021 at 7:02 PM Fande Kong <fdkong.jd@gmail.com> wrote:

Thanks, Matt

On Mon, Dec 6, 2021 at 4:47 PM Matthew Knepley <knepley@gmail.com> wrote:

On Mon, Dec 6, 2021 at 6:40 PM Fande Kong <fdkong.jd@gmail.com> 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/

--

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/