[petsc-dev] model for parallel ASM

[Mark Adams]

Is this stream object going to have Cuda, Kokkos, etc., implementations?

On Sat, Jan 9, 2021 at 4:09 PM Jacob Faibussowitsch <jacob.fai at gmail.com>
wrote:

> I’m currently working on an implementation of a general PetscStream
> object. Currently it only supports Vector ops and has a proof of concept
> KSPCG, but should be extensible to other objects when finished. Junchao is
> also indirectly working on pipeline support in his NVSHMEM MR. Take a look
> at either MR, it would be very useful to get your input, as tailoring
> either of these approaches for pipelined algorithms is key.
>
> Best regards,
>
> Jacob Faibussowitsch
> (Jacob Fai - booss - oh - vitch)
> Cell: (312) 694-3391
>
> On Jan 9, 2021, at 15:01, Mark Adams <mfadams at lbl.gov> wrote:
>
> I would like to put a non-overlapping ASM solve on the GPU. It's not clear
> that we have a model for this.
>
> PCApply_ASM currently pipelines the scater with the subdomain solves. I
> think we would want to change this and do a 1) scatter begin loop, 2)
> scatter end and non-blocking solve loop, 3) solve-wait and scatter
> begging loop and 4) scatter end loop.
>
> I'm not sure how to go about doing this.
>  * Should we make a new PCApply_ASM_PARALLEL or dump this pipelining
> algorithm and rewrite PCApply_ASM?
>  * Add a solver-wait method to KSP?
>
> Thoughts?
>
> Mark
>
>
>
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