From: | Heikki Linnakangas <heikki(at)enterprisedb(dot)com> |
---|---|
To: | Greg Smith <gsmith(at)gregsmith(dot)com> |
Cc: | pgsql-patches(at)postgresql(dot)org |
Subject: | Re: Automatic adjustment of bgwriter_lru_maxpages |
Date: | 2007-05-14 13:41:25 |
Message-ID: | 46486705.3000507@enterprisedb.com |
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Lists: | pgsql-hackers pgsql-patches pgsql-performance |
Greg Smith wrote:
> On Mon, 14 May 2007, ITAGAKI Takahiro wrote:
>
>> BTW, your patch will cut LRU writes short, but will not encourage to
>> do more works. So should set more aggressive values to
>> bgwriter_lru_percent
>> and bgwriter_lru_maxpages as defaults?
>
> Setting a bigger default maximum is one possibility I was thinking
> about. Since the whole background writer setup is kind of complicated,
> the other thing I was working on is writing a guide on how to use the
> new pg_stat_bgwriter information to figure out if you need to increase
> bgwriter_[all|lru]_pages (and the other parameters too). It makes it
> much easier to write that if you can say "You can safely set
> bgwriter_lru_maxpages high because it only writes what it needs to based
> on your usage".
If it's safe to set it high, let's default it to infinity.
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
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