On Sun, Jul 31, 2016 at 1:36 PM, Mateusz Guzik <mjgu...@gmail.com> wrote:
> On Sun, Jul 31, 2016 at 07:03:08AM -0700, Adrian Chadd wrote: > > Hi, > > > > Did you test on any 1, 2, 4, 8 cpu machines? just to see if there are > > any performance degredations on lower count CPUs? > > > > I did not test on machines which physically that few cpus, but I did > test the impact on microbenchmark with 2 and 4 threads on the 80-way > machine. There was no difference. > Well, arguably running 4 threads on a 80-way machine is not quite the same as running the same 4 threads on 4-way or 8-way machine. Unless you actually bind your test threads to a specific CPUs, on a bigger system scheduler is free to migrate your thread on another CPU if all 4 are spinning, this might not the option for smaller box. I suggest you at very least re-run your benchmark on a virtual machine with small CPUs count assigned, it should be quite easy to do so on your monster box. -Maxim _______________________________________________ email@example.com mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"