| From: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
|---|---|
| To: | Metin Doslu <metin(at)citusdata(dot)com> |
| Cc: | pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: Parallel Select query performance and shared buffers |
| Date: | 2013-12-03 13:53:23 |
| Message-ID: | 20131203135323.GA5158@eldon.alvh.no-ip.org |
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| Lists: | pgsql-hackers pgsql-performance |
Metin Doslu wrote:
> When we send concurrent Select queries to these tables, query performance
> doesn't scale out with the number of CPU cores. We find that complex Select
> queries scale out better than simpler ones. We also find that increasing
> the block size from 8 KB to 32 KB, or increasing shared_buffers to include
> the working set mitigates the problem to some extent.
Maybe you could help test this patch:
http://www.postgresql.org/message-id/20131115194725.GG5489@awork2.anarazel.de
--
Álvaro Herrera http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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