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Re: [HACKERS] Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)

From: Andres Freund <andres(at)anarazel(dot)de>
To: pgsql-hackers(at)postgresql(dot)org
Cc: Robert Haas <robertmhaas(at)gmail(dot)com>, Alvaro Herrera <alvherre(at)commandprompt(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Greg Smith <greg(at)2ndquadrant(dot)com>, Greg Stark <gsstark(at)mit(dot)edu>, pgsql-performance(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: [HACKERS] Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)
Date: 2010-02-11 02:27:30
Message-ID: 201002110327.35810.andres@anarazel.de (view raw or flat)
Thread:
Lists: pgsql-hackerspgsql-performance
On Monday 08 February 2010 05:53:23 Robert Haas wrote:
> On Sun, Feb 7, 2010 at 10:09 PM, Alvaro Herrera
> 
> <alvherre(at)commandprompt(dot)com> wrote:
> > Andres Freund escribió:
> >> I personally think the fsync on the directory should be added to the
> >> stable branches - other opinions?
> >> If wanted I can prepare patches for that.
> > 
> > Yeah, it seems there are two patches here -- one is the addition of
> > fsync_fname() and the other is the fsync_prepare stuff.
> 
> Andres, you want to take a crack at splitting this up?
I hope I didnt duplicate Gregs work, but I didnt hear back from him, so...

Everything <8.1 is hopeless because cp is used there... I didnt see it worth 
to replace that. The patch applies cleanly for 8.1 to 8.4 and survives the 
regression tests

Given pg's heavy commit model I didnt see a point to split the patch for 9.0 
as well...

Andres

Attachment: directory-fsync-8.1-to-8.4.patch
Description: text/x-patch (1.1 KB)

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