To elaborate

By: Chester (lamchester.delete@this.gmail.com), July 13, 2020 8:30 pm
Room: Moderated Discussions
Anon (no.delete@this.spam.com) on July 13, 2020 2:06 pm wrote:
> Adrian (a.delete@this.acm.org) on July 13, 2020 1:45 pm wrote:
> > Therefore, for a given power limit per socket, a CPU with 512-bit
> > SIMD will always beat any CPU with narrower FP units.
>
> On the very limited subset of very well vectorizable workloads.
>
> > That does not necessarily mean that it is good to have maximum vector width on all cores. I believe
> > that an asymmetrical dual-socket could be faster, e.g. if in one socket you would have an 8-core
> > or 16-core CPU with maximum clock frequency, which will not be down-clocked when the second socket
> > consumes maximum power, the second socket having e.g. a 64-core CPU with dual 512-bit FMA.
>
> Sounds like a host CPU with GPUs.
>
> BTW, a lot of non-vector low frequency cores is also helpful, there
> are parallelizable workloads that are not vector friendly.

Also there are AVX workloads where AVX is just a few percent of instructions. Then you have a tough decision to make between AVX and more cores.
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