| From: | david(at)lang(dot)hm |
|---|---|
| To: | Greg Stark <gsstark(at)mit(dot)edu> |
| Cc: | Andres Freund <andres(at)anarazel(dot)de>, pgsql-performance(at)postgresql(dot)org, pgsql-hackers(at)postgresql(dot)org, Michael Clemmons <glassresistor(at)gmail(dot)com>, Hannu Krosing <hannu(at)2ndquadrant(dot)com>, Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com> |
| Subject: | Re: Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb) |
| Date: | 2009-12-29 00:30:17 |
| Message-ID: | alpine.DEB.2.00.0912281629150.24130@asgard.lang.hm |
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| Thread: | |
| Lists: | pgsql-hackers pgsql-performance |
On Tue, 29 Dec 2009, Greg Stark wrote:
> On Mon, Dec 28, 2009 at 10:54 PM, Andres Freund <andres(at)anarazel(dot)de> wrote:
>> fsync everything in that pass.
>> Including the directory - which was not done before and actually might be
>> necessary in some cases.
>
> Er. Yes. At least on ext4 this is pretty important. I wish it weren't,
> but it doesn't look like we're going to convince the ext4 developers
> they're crazy any day soon and it would really suck for a database
> created from a template to have files in it go missin.
actually, as I understand it you need to do this on all filesystems except
ext3, and on ext3 fsync is horribly slow because it writes out
_everything_ that's pending, not just stuff related to the file you do the
fsync on.
David Lang
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