[petsc-dev] model for parallel ASM

[Mark Adams]

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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