[petsc-dev] model for parallel ASM

Sat Jan 9 15:09:02 CST 2021

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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