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

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Tue, 29 Dec 2009, Greg Stark wrote:

On Mon, Dec 28, 2009 at 10:54 PM, Andres Freund <andres@xxxxxxxxxxx> 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

--
Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-performance

[Postgresql General]     [Postgresql PHP]     [PHP Users]     [PHP Home]     [PHP on Windows]     [Kernel Newbies]     [PHP Classes]     [PHP Books]     [PHP Databases]     [Yosemite]

  Powered by Linux