From: Dmitriy Sarafannikov <d.sarafannikov@bk.ru>
To: andres <andres@anarazel.de>
Cc: root@simply.name, pgsql-performance@postgresql.org, PostgreSQL-development <pgsql-hackers@postgresql.org>
Subject: Re: [HACKERS] [PERFORM] 9.4 -> 9.5 regression with queries through pgbouncer on RHEL 6
Date: Fri, 15 Jul 2016 12:24:21 +0300
Message-ID: <1468574661.605279425@f427.i.mail.ru> (raw)
In-Reply-To: <1468572683.710083822@f300.i.mail.ru>
References: <1468572683.710083822@f300.i.mail.ru>
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>I don't really see anything suspicious in the profile. This looks more
>like a kernel scheduler issue than a postgres bottleneck one. It seems
>that somehow using nonblocking IO (started in 9.5) causes scheduling
>issues when pgbouncer is also local.
>
>Could you do perf stat -ddd -a sleep 10 or something during both runs? I
>suspect that the context switch ratios will be quite different.
Perf show that in 9.5 case context switches occurs about 2 times less.
Perf output is attached.
Regards,
Dmitriy Sarafannikov
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To: pgsql-performance@postgresql.org
Cc: d.sarafannikov@bk.ru, andres@anarazel.de, pgsql-hackers@postgresql.org
Subject: Re: Re: [HACKERS] [PERFORM] 9.4 -> 9.5 regression with queries through pgbouncer on RHEL 6
In-Reply-To: <1468574661.605279425@f427.i.mail.ru>
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