Return-Path: <Sebastian@SSpaeth.de>
X-Original-To: notmuch@notmuchmail.org
Delivered-To: notmuch@notmuchmail.org
Received: from localhost (localhost [127.0.0.1])
	by olra.theworths.org (Postfix) with ESMTP id EF7954196F2
	for <notmuch@notmuchmail.org>; Mon, 12 Apr 2010 08:24:51 -0700 (PDT)
X-Virus-Scanned: Debian amavisd-new at olra.theworths.org
X-Spam-Flag: NO
X-Spam-Score: -1.9
X-Spam-Level: 
X-Spam-Status: No, score=-1.9 tagged_above=-999 required=5
	tests=[BAYES_00=-1.9] autolearn=ham
Received: from olra.theworths.org ([127.0.0.1])
	by localhost (olra.theworths.org [127.0.0.1]) (amavisd-new, port 10024)
	with ESMTP id ChhiakYbxrkG for <notmuch@notmuchmail.org>;
	Mon, 12 Apr 2010 08:24:51 -0700 (PDT)
Received: from homiemail-a11.g.dreamhost.com (caiajhbdcaib.dreamhost.com
	[208.97.132.81])
	by olra.theworths.org (Postfix) with ESMTP id 3F479431FC1
	for <notmuch@notmuchmail.org>; Mon, 12 Apr 2010 08:24:51 -0700 (PDT)
Received: from sspaeth.de (mtec-hg-docking-1-dhcp-204.ethz.ch
	[129.132.133.204])
	by homiemail-a11.g.dreamhost.com (Postfix) with ESMTPA id 3A106194058; 
	Mon, 12 Apr 2010 08:24:42 -0700 (PDT)
Received: by sspaeth.de (sSMTP sendmail emulation);
	Mon, 12 Apr 2010 17:24:35 +0200
From: "Sebastian Spaeth" <Sebastian@SSpaeth.de>
To: Jameson Rollins <jrollins@finestructure.net>, Notmuch list
	<notmuch@notmuchmail.org>
Subject: Re: please eat my data!
In-Reply-To: <87tyrgeopc.fsf@servo.finestructure.net>
References: <87633wlrrk.fsf@SSpaeth.de>
	<87tyrgeopc.fsf@servo.finestructure.net>
Date: Mon, 12 Apr 2010 17:24:35 +0200
Message-ID: <87iq7wpubw.fsf@SSpaeth.de>
User-Agent: notmuch version 0.1.1 (Emacs 23.1.1/x86_64-pc-linux-gnu)
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
X-BeenThere: notmuch@notmuchmail.org
X-Mailman-Version: 2.1.13
Precedence: list
List-Id: "Use and development of the notmuch mail system."
	<notmuch.notmuchmail.org>
List-Unsubscribe: <http://notmuchmail.org/mailman/options/notmuch>,
	<mailto:notmuch-request@notmuchmail.org?subject=unsubscribe>
List-Archive: <http://notmuchmail.org/pipermail/notmuch>
List-Post: <mailto:notmuch@notmuchmail.org>
List-Help: <mailto:notmuch-request@notmuchmail.org?subject=help>
List-Subscribe: <http://notmuchmail.org/mailman/listinfo/notmuch>,
	<mailto:notmuch-request@notmuchmail.org?subject=subscribe>
X-List-Received-Date: Mon, 12 Apr 2010 15:24:52 -0000

On 2010-04-12, Jameson Rollins wrote:
> On Mon, 12 Apr 2010 15:33:35 +0200, "Sebastian Spaeth" > Wow, this is really interesting, Sebastian.  For those of us not in the
> know, can you explain what libeatmydata is and how it's used?

Hehe, I just got the pointer to it on IRC myself:

http://www.flamingspork.com/projects/libeatmydata/

You download and untar the thing, and "make" it, which produces
libeatmydata.so. Running a binary foo with LD_PRELOAD=./libeatmydata.so foo
will then effectively make all fsyncs a Noop. Not something you want on
your production systems, but great to test how much of a penality those
fsyncs really are.

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.

Sebastian