Messages in this thread | | | Date | Fri, 22 Feb 2013 14:06:17 +0800 | From | Michael Wang <> | Subject | Re: [RFC PATCH v3 0/3] sched: simplify the select_task_rq_fair() |
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On 02/22/2013 01:08 PM, Mike Galbraith wrote: > On Fri, 2013-02-22 at 10:37 +0800, Michael Wang wrote: > >> According to the testing result, I could not agree this purpose of >> wake_affine() benefit us, but I'm sure that wake_affine() is a terrible >> performance killer when system is busy. > > (hm, result is singular.. pgbench in 1:N mode only?)
I'm not sure about how pgbench implemented, all I know is it will create several instance and access the database, I suppose no different from several threads access database (1 server and N clients?).
There are improvement since when system busy, wake_affine() will be skipped.
And in old world, when system is busy, wake_affine() will only be skipped if prev_cpu and curr_cpu belong to different nodes.
Regards, Michael Wang
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