Re: I: About "Our CLUSTER implementation is pessimal" patch - Mailing list pgsql-hackers

From Alvaro Herrera
Subject Re: I: About "Our CLUSTER implementation is pessimal" patch
Date
Msg-id 1285733907-sup-8868@alvh.no-ip.org
Whole thread Raw
In response to Re: I: About "Our CLUSTER implementation is pessimal" patch  (Josh Kupershmidt <schmiddy@gmail.com>)
Responses Re: I: About "Our CLUSTER implementation is pessimal" patch
List pgsql-hackers
Excerpts from Josh Kupershmidt's message of mar sep 28 23:53:33 -0400 2010:

> I started looking at the performance impact of this patch based on
> Leonardo's SQL file. On the 2 million row table, I see a consistent
> ~10% advantage for the sequential scan clusters. I'm going to try to
> run the bigger tests a few times and post results from there when I
> get a chance.

10% is nothing.  I was expecting this patch would give an order of
magnitude of improvement or somethine like that in the worst cases of
the current code (highly unsorted input)

-- 
Álvaro Herrera <alvherre@commandprompt.com>
The PostgreSQL Company - Command Prompt, Inc.
PostgreSQL Replication, Consulting, Custom Development, 24x7 support


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