[petsc-users] Configuring PETSc for KNL

[Jed Brown]

Justin Chang <jychang48 at gmail.com> writes:

> So I tried the following options:
>
> -M 40
> -N 40
> -P 5
> -da_refine 1/2/3/4
> -log_view
> -mg_coarse_pc_type gamg
> -mg_levels_0_pc_type gamg
> -mg_levels_1_sub_pc_type cholesky
> -pc_type mg
> -thi_mat_type baij
>
> Performance improved dramatically. However, Haswell still beats out KNL but
> only by a little. Now it seems like MatSOR is taking some time (though I
> can't really judge whether it's significant or not). Attached are the log
> files.

MatSOR is gonna suck on KNL without some dirty work.

> If ex48 has SSE2 intrinsics, does that mean Haswell would almost always be
> better?

The SSE2 intrinsics are only in Jacobian assemble and could be upgraded
to AVX/512.
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