Re: [RFC][PATCH 00/26] sched/numa

Linus Torvalds
2012-03-20T00:05:56Z

On Mon, Mar 19, 2012 at 1:28 PM, Ingo Molnar <mingo@kernel.org> wrote:
>
> That having said PeterZ's numbers showed some pretty good
> improvement for the streams workload:
>
>  before: 512.8M
>  after: 615.7M
>
> i.e. a +20% improvement on a not very heavily NUMA box.

Well, streams really isn't a very interesting benchmark. It's the
traditional single-threaded cpu-only thing that just accesses things
linearly, and I'm not convinced the numbers should be taken to mean
anything at all.

The HPC people want to multi-thread things these days, and "cpu/memory
affinity" is a lot less clear then.

So I can easily imagine that the performance improvement is real, but
I really don't think "streams improves by X %" is all that
interesting. Are there any more relevant loads that actually matter to
people that we could show improvement on?

Linus