From: | Bruce Momjian <bruce(at)momjian(dot)us> |
---|---|
To: | Greg Smith <greg(at)2ndquadrant(dot)com> |
Cc: | pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: Spread checkpoint sync |
Date: | 2011-02-01 18:30:53 |
Message-ID: | 201102011830.p11IUrW19502@momjian.us |
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Thread: | |
Lists: | pgsql-hackers |
Greg Smith wrote:
> Greg Smith wrote:
> > I think the right way to compute "relations to sync" is to finish the
> > sorted writes patch I sent over a not quite right yet update to already
>
> Attached update now makes much more sense than the misguided patch I
> submitted two weesk ago. This takes the original sorted write code,
> first adjusting it so it only allocates the memory its tag structure is
> stored in once (in a kind of lazy way I can improve on right now). It
> then computes a bunch of derived statistics from a single walk of the
> sorted data on each pass through. Here's an example of what comes out:
In that patch, I would like to see a meta-comment explaining why the
sorting is happening and what we hope to gain.
--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://enterprisedb.com
+ It's impossible for everything to be true. +
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