[petsc-dev] Hybrid MPI/OpenMP reflections

[Jed Brown]

Karl Rupp <rupp at mcs.anl.gov> writes:
> When using good preconditioners, spMV is essentially never the 
> bottleneck and hence I don't think a separate communication thread 
> should be implemented in PETSc. Instead, such a fallback should be part 
> of a good MPI implementation.

SpMV is an important part of most of those scalable preconditioners.  In
multigrid, those are grid transfer operators, residuals, and Chebyshev
or Krylov-accelerated smoothers.
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