| From: | Kenneth Marshall <ktm(at)rice(dot)edu> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Stefan Kaltenbrunner <stefan(at)kaltenbrunner(dot)cc>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: 8.4 open item: copy performance regression? |
| Date: | 2009-06-18 23:47:46 |
| Message-ID: | 20090618234746.GG23785@it.is.rice.edu |
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| Lists: | pgsql-hackers |
On Thu, Jun 18, 2009 at 05:20:08PM -0400, Tom Lane wrote:
> Stefan Kaltenbrunner <stefan(at)kaltenbrunner(dot)cc> writes:
> > Any objections if I add:
> > http://archives.postgresql.org/pgsql-performance/2009-06/msg00215.php
> > to the (currently empty) list of open items for 8.4?
>
> I am unable to duplicate any slowdown on this test case. AFAICT
> 8.4 and 8.3 branch tip are about the same speed; if anything 8.4
> is faster. Testing on x86_64 Fedora 10 ...
>
> regards, tom lane
>
What is not clear from Stefen's function listing is how the 8.4
server could issue 33% more XLogInsert() and CopyReadLine()
calls than the 8.3.7 server using the same input file. That would
account for the slow down but now why it is happening.
Cheers,
Ken
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