[petsc-users] MPI speedup

[Jed Brown]

Matthew Knepley <knepley at gmail.com> writes:
>Your processor has
> 6 cores, each running at 3.4 GHz, and it can do 4flops/cycle using the
> vector instructions, 

Actually, it has AVX, so it can do 8 flops/cycle (1 packed multiply and
1 packed add, each with 4-wide vector registers).

>so they
> report that it can do 81 GF/s, but you cannot get values to it fast enough
> to compute.

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