[pgpool-general: 3962] Re: accept() scalability issues
michael.renner at amd.co.at
Thu Aug 13 23:15:22 JST 2015
> On 13 Aug 2015, at 15:21, Pablo Sanchez <pablo at blueoakdb.com> wrote:
> On 08/13/2015 09:18 AM, Michael Renner wrote:
>> Thank you very much, that worked fine!
>> In a synthetic test with 1000 children and ~30 connections per
>> second this lowered the amount of context switches from ~38.000/sec to
> Hey Michael,
> Do you have any /sar -u 3 XXX/ data showing CPU usage between /before/
> and /after/?
No, not more than the vmstat output in my initial mail: http://nopaste.narf.at/show/25531/ <http://nopaste.narf.at/show/25531/>. And those values are quite dependent on the environment you’re running, so I find them not very interesting to compare.
You can easily reproduce the behaviour by running pgpool with a few hundred to thousands of pgpool children and a rate of 50-100 new connections per second.
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