lkml.org 
[lkml]   [2012]   [Jun]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [rfc][patch] select_idle_sibling() inducing bouncing on westmere
From
Date
btw, numbers are intended to invoke: "Gee, wonder what if anything this
does to/for my favorite load" ;-)

On Wed, 2012-06-06 at 12:17 +0200, Mike Galbraith wrote:
> On Thu, 2012-05-24 at 15:17 +0200, Peter Zijlstra wrote:
>
> > Did you do you numbers with the distro NR_CPUS=4096 bloat?
>
> 4 socket Westmere-EX 40 core box.. ouch^ouch.
>
> 3.0 has none of the below, 3.0x all, 3.0xx all but the ones commented
> out. Most of the deltas are sibling avoidance, though throttle-nohz
> plays a role in 3.0 vs 3.0x, as does knob tweakery, though very very
> small for these particular tests. The rest are ~meaningless.
>
> sched-use-rt-nr_cpus_allowed-to-recover-select_task_rq-cycles.patch
> sched-set-skip_clock_update-when-yielding.patch
> sched-throttle-nohz.patch
> sched-Wrap-scheduler-p--cpus_allowed-access.patch
> sched-Avoid-SMT-siblings-in-select_idle_sibling-if-possible.patch
> sched-Clean-up-domain-traversal-in-select_idle_sibling.patch
> sched-Remove-rcu_read_lock-unlock-from-select_idle_sibling.patch
> sched-Fix-the-sched-group-node-allocation-for-SD_OVERLAP-domains.patch
> sched-domain-flags-proc-handler.patch
> # sched-tweak-select_idle_sibling.patch
> sched-tweak-knobs.patch
> # sched-ratelimit-affine-wakeup-migrations.patch
>
> thench 1 2 4 8 16 32 64 128
> 3.0 225 451 911 1573 2723 3501 11189 13951
> 3.0x 299 603 1211 2418 4697 6847 11606 14557
> vs 3.0 1.328 1.337 1.329 1.537 1.724 1.955 1.037 1.043
>
> 3.0xx 30 41 118 645 3769 6214 12233 14312
> vs 3.0x 0.100 0.067 0.097 0.266 0.802 0.907 1.054 0.983
> hmmm
> aim7 ~low load.. not saturating.
>
> Benchmark Version Machine Run Date
> AIM Multiuser Benchmark - Suite VII "1.1" 3.0x Jun 6 09:29:20 2012
>
> Tasks Jobs/Min JTI Real CPU Jobs/sec/task
> 64 26223.1 98 14.8 293.3 6.8289
>
> Benchmark Version Machine Run Date
> AIM Multiuser Benchmark - Suite VII "1.1" 3.0xx Jun 6 11:12:21 2012
>
> Tasks Jobs/Min JTI Real CPU Jobs/sec/task
> 64 18845.5 82 20.6 254.8 4.9077 vs 3.0x 0.718
>
>




\
 
 \ /
  Last update: 2012-06-06 13:21    [W:0.141 / U:0.072 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site