[petsc-dev] Additive Schwarz Method + ILU on GPU platforms

[Mark Adams]

On Mon, Apr 14, 2025 at 5:39 PM Angus, Justin Ray via petsc-dev <
petsc-dev at mcs.anl.gov> wrote:

> Hello,
>
>
>
> A project I work on uses GMRES via PETSc. In particular, we have had good
> successes using the Additive Schwarz Method + ILU preconditioner setup
> using a CPU-based code. I found online where it is stated that “Parts of
> most preconditioners run directly on the GPU” (
> https://urldefense.us/v3/__https://petsc.org/release/faq/__;!!G_uCfscf7eWS!b6W7_M2jV7B9Y5JSrKcbakL7unFI_HIIl9xudrQlIbvhEnbR3PsIsZwctoHOF_guJoQGSbuKdcOkJSqIVCm0TA$ 
> <https://urldefense.us/v3/__https://petsc.org/release/faq/__;!!G_uCfscf7eWS!bw6qeKcY7MKSvlEgcogdKR7fpjZSOFvka6zfDprUZ_sJHdE-YZmRD6UTqWQW3_uGVBII4P-AG0zaGTLbI67_fQ$>).
> Is ASM + ILU also available for GPU platforms?
>

Yes, but it will be hard to get speedup from CPUs.
It is easy to test though. Jacobi or pbjacobi if you have a vector equation
is probably faster.

Mark


>
>
> -Justin
>
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