Messages in this thread | | | Date | Fri, 14 Jun 2013 22:35:22 -0700 | From | Tejun Heo <> | Subject | Re: [PATCH 11/11] cgroup: use percpu refcnt for cgroup_subsys_states |
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On Fri, Jun 14, 2013 at 03:31:25PM -0700, Tejun Heo wrote: > I'll play with it a bit more on an actual machine and post more > results. Test program attached.
So, here are the results from the same test on a dual-socket 2-way NUMA opteron 8 core machine.
Running on one CPU.
copy size atomic percpu diff in pct 0 535964443 616756827 +15.07% 32 399988186 378678713 -5.33% 64 389067476 355073979 -8.74% 128 342192631 315615300 -7.77% 256 281208005 260598931 -7.33% 512 188070912 193225269 +2.74%
Running on all eight cores.
copy size atomic percpu diff in pct 0 121324328 4889425511 +3,930.05% 32 96170193 2999613380 +3,019.07% 64 98139061 2813894184 +2,767.25% 128 112610025 2503229487 +2,122.92% 256 96828114 2069865752 +2,037.67% 512 95858297 1537726109 +1,504.17%
Ration of all cores / single core.
copy size atomic percpu 0 0.23 7.93 32 0.24 7.92 64 0.25 7.92 128 0.33 7.93 256 0.34 7.94 512 0.51 7.96
Note exactly 8 - the cores do share quite a bit of resources after all - but pretty close.
Thanks.
-- tejun
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