Jan Blechta <[email protected]> writes: > Jed, don't you build BLAS in PETSc configure by something like > --with-openblas=1. If so, I suppose you build it without threads.
We only build reference BLAS because optimized BLAS is more of a hassle to build and nearly irrelevant for what is used in typical sparse iterative methods. On the other hand, sparse direct solvers benefit significantly from tuned Level 3.
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