| From: | Andres Freund <andres(at)2ndquadrant(dot)com> |
|---|---|
| To: | Bruce Momjian <bruce(at)momjian(dot)us> |
| Cc: | "ktm(at)rice(dot)edu" <ktm(at)rice(dot)edu>, Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, Jeff Davis <pgsql(at)j-davis(dot)com>, Heikki Linnakangas <hlinnakangas(at)vmware(dot)com>, Fujii Masao <masao(dot)fujii(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Compression of full-page-writes |
| Date: | 2015-01-02 16:55:52 |
| Message-ID: | 20150102165552.GB3064@awork2.anarazel.de |
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| Lists: | pgsql-hackers |
On 2015-01-02 11:52:42 -0500, Bruce Momjian wrote:
> Why are we not seeing the 33% compression and 15% performance
> improvement he saw? What am I missing here?
To see performance improvements something needs to be the bottleneck. If
WAL writes/flushes aren't that in the tested scenario, you won't see a
performance benefit. Amdahl's law and all that.
I don't understand your negativity about the topic.
Greetings,
Andres Freund
--
Andres Freund http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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