| From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | pgsql-hackers(at)postgreSQL(dot)org, acm(at)tweakers(dot)net |
| Subject: | Re: Reducing stats collection overhead |
| Date: | 2007-05-18 13:12:18 |
| Message-ID: | 20070518131218.GA5639@alvh.no-ip.org |
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| Lists: | pgsql-hackers |
Tom Lane wrote:
> Arjen van der Meijden told me that according to the tweakers.net
> benchmark, HEAD is noticeably slower than 8.2.4, and I soon confirmed
> here that for small SELECT queries issued as separate transactions,
> there's a significant difference. I think much of the difference stems
> from the fact that we now have stats_row_level ON by default, and so
> every transaction sends a stats message that wasn't there by default
> in 8.2. When you're doing a few thousand transactions per second
> (not hard for small read-only queries) that adds up.
So, did this patch make the performance problem go away?
--
Alvaro Herrera http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support
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