| From: | Greg Smith <gsmith(at)gregsmith(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | ITAGAKI Takahiro <itagaki(dot)takahiro(at)oss(dot)ntt(dot)co(dot)jp>, pgsql-patches(at)postgresql(dot)org |
| Subject: | Re: Sorting writes during checkpoint |
| Date: | 2008-05-04 23:12:32 |
| Message-ID: | Pine.GSO.4.64.0805041905030.14259@westnet.com |
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| Lists: | pgsql-hackers pgsql-patches |
On Sun, 4 May 2008, Tom Lane wrote:
> However, I am completely unable to measure any performance improvement
> from it. Given the possible risk of out-of-memory failures, I think the
> patch should not be applied without some direct proof of performance
> benefits, and I don't see any.
Fair enough. There were some pgbench results attached to the original
patch submission that gave me a good idea how to replicate the situation
where there's some improvement. I expect I can take a shot at quantifying
that independantly near the end of this month if nobody else gets to it
before then (I'm stuck sorting out a number of OS level issue right now
before my testing system is online again). Was planning to take a longer
look at Greg Stark's prefetching work at that point as well.
--
* Greg Smith gsmith(at)gregsmith(dot)com http://www.gregsmith.com Baltimore, MD
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