Karl Rupp <[email protected]> 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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