| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | Heikki Linnakangas <hlinnaka(at)iki(dot)fi> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Alexander Korotkov <a(dot)korotkov(at)postgrespro(dot)ru>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Dilip Kumar <dilipbalaut(at)gmail(dot)com>, Jeff Davis <pgsql(at)j-davis(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Greg Stark <stark(at)mit(dot)edu>, Andres Freund <andres(at)2ndquadrant(dot)com>, Rajeev rastogi <rajeev(dot)rastogi(at)huawei(dot)com>, Markus Wanner <markus(at)bluegap(dot)ch>, Ants Aasma <ants(at)cybertec(dot)at>, Bruce Momjian <bruce(at)momjian(dot)us>, obartunov <obartunov(at)postgrespro(dot)ru>, Teodor Sigaev <teodor(at)postgrespro(dot)ru>, Borodin Vladimir <root(at)simply(dot)name> |
| Subject: | Re: Proposal for CSN based snapshots |
| Date: | 2016-08-23 16:53:06 |
| Message-ID: | 20160823165306.hsazlkg7ydaug2gh@alap3.anarazel.de |
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| Lists: | pgsql-hackers |
On 2016-08-23 18:18:57 +0300, Heikki Linnakangas wrote:
> I installed Greg Smith's pgbench-tools kit on that server, and ran some
> tests. I'm seeing some benefit on "pgbench -N" workload, but only after
> modifying the test script to use "-M prepared", and using Unix domain
> sockets instead of TCP to connect. Apparently those things add enough
> overhead to mask out the little difference.
To make the problem more apparent, how are the differences for something
as extreme as just a
SELECT 1;
or a
SELECT 1 FROM pgbench_accounts WHERE aid = 1;
Greetings,
Andres Freund
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