From: Dirk Hohndel <hohndel@infradead.org>
To: Stewart Smith <stewart@flamingspork.com>,
Sebastian Spaeth <Sebastian@SSpaeth.de>,
Jameson Rollins <jrollins@finestructure.net>,
Notmuch list <notmuch@notmuchmail.org>
Subject: Re: please eat my data!
Date: Mon, 12 Apr 2010 10:47:47 -0700 [thread overview]
Message-ID: <m3sk705zr0.fsf@x200.gr8dns.org> (raw)
In-Reply-To: <87ljcsr3tu.fsf@willster.local.flamingspork.com>
On Mon, 12 Apr 2010 10:14:05 -0700, Stewart Smith <stewart@flamingspork.com> wrote:
> On Mon, 12 Apr 2010 17:24:35 +0200, "Sebastian Spaeth" <Sebastian@SSpaeth.de> wrote:
> > What I find intersting is that we have a 2x speedup and a 10x speedup
> > for different queries. Olly was saying on IRC that both *should* really be
> > behaving in much the same manner.
>
> Remember that on ext3 (and pretty sure ext4) fsync is the same as
> sync(). So performance depends on how much dirty data you have in your cache.
>
> libeatmydata also gets rid of msync(), O_SYNC etc as well.
Which is why so many of us have started to use BTRFS...
Much smaller performance degradation when doing frequent fsync's
/D
--
Dirk Hohndel
Intel Open Source Technology Center
next prev parent reply other threads:[~2010-04-12 17:47 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-12 13:33 please eat my data! Sebastian Spaeth
2010-04-12 14:21 ` Jameson Rollins
2010-04-12 14:41 ` racin
2010-04-12 15:24 ` Sebastian Spaeth
2010-04-12 17:14 ` Stewart Smith
2010-04-12 17:47 ` Dirk Hohndel [this message]
2010-04-12 23:10 ` Servilio Afre Puentes
2010-04-12 23:35 ` Dirk Hohndel
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