| From: | Alex Hunsaker <badalex(at)gmail(dot)com> |
|---|---|
| To: | "Todd A(dot) Cook" <tcook(at)blackducksoftware(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: slow commits with heavy temp table usage in 8.4.0 |
| Date: | 2009-08-06 18:13:41 |
| Message-ID: | 34d269d40908061113j5c883d91s5633a35e1e38bf87@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Thu, Aug 6, 2009 at 11:32, Todd A. Cook<tcook(at)blackducksoftware(dot)com> wrote:
> Tom Lane wrote:
>>
>> I took a look through the CVS history and verified that there were
>> no post-8.4 commits that looked like they'd affect performance in
>> this area. So I think it's got to be a platform difference not a
>> PG version difference. In particular I think we are probably looking
>> at a filesystem issue: how fast can you delete [...] 30000 files.
>
> I'm still on Fedora 7, so maybe this will be motivation to upgrade.
>
> FYI, on my 8.2.13 system, the test created 30001 files which were all
> deleted during the commit. On my 8.4.0 system, the test created 60001
> files, of which 30000 were deleted at commit and 30001 disappeared
> later (presumably during a checkpoint?).
Smells like fsm? With double the number of files maybe something
simple like turning on dir_index if you are ext3 will help?
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