[petsc-users] gamg out of memory with gpu

[Matthew Knepley]

On Mon, Dec 26, 2022 at 4:41 AM Edoardo Centofanti <
edoardo.centofanti01 at universitadipavia.it> wrote:

> Hi PETSc Users,
>
> I am experimenting some issues with the GAMG precondtioner when used with
> GPU.
> In particular, it seems to go out of memory very easily (around 5000
> dofs are enough to make it throw the "[0]PETSC ERROR: cuda error 2
> (cudaErrorMemoryAllocation) : out of memory" error).
> I have these issues both with single and multiple GPUs (on the same or on
> different nodes). The exact same problems work like a charm with HYPRE
> BoomerAMG on GPUs.
> With both preconditioners I exploit the device acceleration by giving the
> usual command line options "-dm_vec_type cuda" and "-dm_mat_type
> aijcusparse" (I am working with structured meshes). My PETSc version is
> 3.17.
>
> Is this a known issue of the GAMG preconditioner?
>

No. Can you get it to do this with a PETSc example? Say SNES ex5?

  Thanks,

     Matt


> Thank you in advance,
> Edoardo
>


-- 
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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