From owner-freebsd-ports@FreeBSD.ORG  Thu Apr 12 19:48:10 2007
Return-Path: <owner-freebsd-ports@FreeBSD.ORG>
X-Original-To: freebsd-ports@freebsd.org
Delivered-To: freebsd-ports@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52])
	by hub.freebsd.org (Postfix) with ESMTP id C03D116A400
	for <freebsd-ports@freebsd.org>; Thu, 12 Apr 2007 19:48:10 +0000 (UTC)
	(envelope-from LoN_Kamikaze@gmx.de)
Received: from mail.gmx.net (mail.gmx.net [213.165.64.20])
	by mx1.freebsd.org (Postfix) with SMTP id 188C413C4AE
	for <freebsd-ports@freebsd.org>; Thu, 12 Apr 2007 19:48:09 +0000 (UTC)
	(envelope-from LoN_Kamikaze@gmx.de)
Received: (qmail invoked by alias); 12 Apr 2007 19:48:08 -0000
Received: from nat-wh-1.rz.uni-karlsruhe.de (EHLO [192.168.1.12])
	[129.13.72.169]
	by mail.gmx.net (mp049) with SMTP; 12 Apr 2007 21:48:08 +0200
X-Authenticated: #5465401
X-Provags-ID: V01U2FsdGVkX187h1AcN/M7f9hpv1+OzwvMjIvZ3NowgzNJtVIEOo
	PjjjjjQrw1t6Ha
Message-ID: <461E8CF3.3030203@gmx.de>
Date: Thu, 12 Apr 2007 21:48:03 +0200
From: "[LoN]Kamikaze" <LoN_Kamikaze@gmx.de>
User-Agent: Thunderbird 1.5.0.10 (X11/20070314)
MIME-Version: 1.0
To: Benjamin Lutz <mail@maxlor.com>
References: <200704100452.40574.mail@maxlor.com>	<1176363454.72184.2.camel@pav.hide.vol.cz>	<461DF6A3.9030201@u.washington.edu>
	<200704122108.01376.mail@maxlor.com>
In-Reply-To: <200704122108.01376.mail@maxlor.com>
X-Enigmail-Version: 0.94.0.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit
X-Y-GMX-Trusted: 0
Cc: Garrett Cooper <youshi10@u.washington.edu>, freebsd-ports@freebsd.org
Subject: Re: parallel builds revisited
X-BeenThere: freebsd-ports@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Porting software to FreeBSD <freebsd-ports.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-ports>,
	<mailto:freebsd-ports-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-ports>
List-Post: <mailto:freebsd-ports@freebsd.org>
List-Help: <mailto:freebsd-ports-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-ports>,
	<mailto:freebsd-ports-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 12 Apr 2007 19:48:10 -0000

Benjamin Lutz wrote:
> On Thursday 12 April 2007 11:06, Garrett Cooper wrote:
>> I dunno how you want to approach this, but gmake does recommend 2
>> jobs be run in parallel for HTT enabled chips, and 3 or 4 jobs for a
>> dual core machines.
>> -Garrett
> 
> So far the approach is one job per CPU. I'll do some benchmarks lateron 
> to determine wether it really helps to run more jobs. For the KDE 
> ports, my gut feeling is that the improvement would be negligible. I'll 
> have to evaluate non-C++ ports like gnome-*, where the compilation time 
> per file is shorter.

I find the benefit especially big with Gecko based ports like Firefox or
Thunderbird.
 
> Of course, to make proper use of distcc, at least #cores + 1 jobs are 
> required. I'll keep that in mind.

The recommendation of the Distcc developers is 2 jobs per core, as long as
the machines contain sufficient memory.

My personal experience says that it's rarely possible to divide a Makefile
into more than 6 threads.