| From: | Jim Nasby <decibel(at)decibel(dot)org> |
|---|---|
| To: | Josh Berkus <josh(at)agliodbs(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: 8.2 is 30% better in pgbench than 8.3 |
| Date: | 2007-07-23 16:49:34 |
| Message-ID: | 636BF45E-A569-457A-95A6-55DA52A76170@decibel.org |
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| Thread: | |
| Lists: | pgsql-hackers |
On Jul 22, 2007, at 8:54 AM, Josh Berkus wrote:
> Tom,
>> Note to all: we ***HAVE TO*** settle on some reasonable default
>> vacuum_cost_delay settings before we can ship 8.3. With no cost
>> delay
>> and two or three workers active, 8.3's autovac does indeed send
>> performance into the tank.
>
> I've been using 20ms for most of my setups. That's aimed at
> reducing autovac to almost no impact at all, but taking a long
> time. Maybe 10ms?
I've found 20ms to be a pretty good number for run-of-the-mill IO
capability, and 10ms to be good for a good RAID setup (RAID10, 8+
drives, BBU).
For a default setting, I think it'd be better to lean towards 20ms.
--
Jim Nasby jim(at)nasby(dot)net
EnterpriseDB http://enterprisedb.com 512.569.9461 (cell)
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