[cfarm-users] CPU speeds of GCC135?

Segher Boessenkool segher at kernel.crashing.org
Wed Jun 5 23:56:04 CEST 2019

On Wed, Jun 05, 2019 at 03:08:58PM -0400, Chuck Atkins via cfarm-users wrote:
> It could be also that you're hitting thread migration across cores, thus
> missing out on the clock ramp up.  I saw quite a few issues with that on
> the p8 running benchmarks a while back.  If that's the case then you can
> try to pin your benchmark to a single cpu core (or a set of them if youd
> like) by running it under "numactl -C <CORE_NUMBER> ./benchmark"

We run the systems in conservative mode.  They are not optimised for
benchmarks.  You'll get useless results from them anyway, except maybe
for trivial things you "benchmark" for development.


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