[petsc-users] Regarding the status of MatSolve on GPUs

[Junchao Zhang]

Hi, Sajid,
   I will have a look to see what is wrong.
   Thanks.
--Junchao Zhang


On Thu, Oct 6, 2022 at 2:32 PM Sajid Ali <sajidsyed2021 at u.northwestern.edu>
wrote:

> Hi PETSc-developers,
>
> Does PETSc currently provide (either native or third party support) for
> MatSolve that can be performed entirely on a GPU given a factored matrix?
> i.e. a direct solver that would store the factors L and U on the device and
> use the GPU to solve the linear system. It does not matter if the GPU is
> not used for the factorization as we intend to solve the same linear system
> for 100s of iterations and thus try to prevent GPU->CPU transfers for the
> MatSolve phase.
>
> Currently, I've built PETSc at main (commit 9c433d, 10/03) with
> superlu-dist at develop, both of which are configured with CUDA. With this,
> I'm seeing that each call to PCApply/MatSolve involves one GPU->CPU
> transfer. Is it possible to avoid this?
>
> Thank You,
> Sajid Ali (he/him) | Research Associate
> Scientific Computing Division
> Fermi National Accelerator Laboratory
> s-sajid-ali.github.io
>
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