Re: [PATCH V5 0/8] Add memcg dirty/writeback page accounting
From: Sha Zhengju <hidden>
Date: 2013-08-03 09:30:28
Also in:
linux-mm
On Thu, Aug 1, 2013 at 10:43 PM, Michal Hocko [off-list ref] wrote:
On Thu 01-08-13 19:43:22, Sha Zhengju wrote: [...]quoted
Some perforcemance numbers got by Mel's pft test (On a 4g memory and 4-core i5 CPU machine):I am little bit confused what is this testcase actually testing... AFAIU it produces a lot of page faults but they are all anonymous and very short lived. So neither dirty nor writeback accounting is done. I would have expected a testcase which generates a lot of IO.
I see. I'm always not good at testing. :(
Also as a general note. It would be better to mention the number of runs and standard deviation so that we have an idea about variability of the load.
OK. Thanks for the notes!
quoted
vanilla : memcg enabled, patch not applied patched : all patches are patched * Duration numbers: vanilla patched User 385.38 379.47 System 65.12 66.46 Elapsed 457.46 452.21 * Summary numbers: vanilla: Clients User System Elapsed Faults/cpu Faults/sec 1 0.03 0.18 0.21 931682.645 910993.850 2 0.03 0.22 0.13 760431.152 1472985.863 3 0.03 0.29 0.12 600495.043 1620311.084 4 0.04 0.37 0.12 475380.531 1688013.267 patched: Clients User System Elapsed Faults/cpu Faults/sec 1 0.02 0.19 0.22 915362.875 898763.732 2 0.03 0.23 0.13 757518.387 1464893.996 3 0.03 0.30 0.12 592113.126 1611873.469 4 0.04 0.38 0.12 472203.393 1680013.271 We can see the performance gap is minor.[...] -- Michal Hocko SUSE Labs
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