[pgpool-general: 3964] Re: accept() scalability issues

Tatsuo Ishii ishii at postgresql.org
Fri Aug 14 09:25:51 JST 2015

>> Ok, here is the experimental patch to serialize select(2) for listen
>> fds by using semaphore. Could you please try it out?  The patch is
>> against 3.3-stable.
> 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 ~1.000/sec.

Great. I'm also interested in if my patch somewhat enhances

> We’ll test it in production mid next week, will let you know how things go.

Looking forward to hearing from you next week!

Best regards,
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php

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