From owner-freebsd-ports@FreeBSD.ORG  Sat Apr 14 05:12:29 2007
Return-Path: <owner-freebsd-ports@FreeBSD.ORG>
X-Original-To: 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 57E8D16A404
	for <ports@freebsd.org>; Sat, 14 Apr 2007 05:12:29 +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 A7BCB13C44C
	for <ports@freebsd.org>; Sat, 14 Apr 2007 05:12:28 +0000 (UTC)
	(envelope-from LoN_Kamikaze@gmx.de)
Received: (qmail invoked by alias); 14 Apr 2007 05:12:27 -0000
Received: from nat-wh-1.rz.uni-karlsruhe.de (EHLO [192.168.1.12])
	[129.13.72.169]
	by mail.gmx.net (mp028) with SMTP; 14 Apr 2007 07:12:27 +0200
X-Authenticated: #5465401
X-Provags-ID: V01U2FsdGVkX1+6fRsYFkq6uRa1LLYRiwhu4sOMEPvDpy92X1FbSK
	MiKiqmH3LFfSjC
Message-ID: <462062B5.5050007@gmx.de>
Date: Sat, 14 Apr 2007 07:12:21 +0200
From: "[LoN]Kamikaze" <LoN_Kamikaze@gmx.de>
User-Agent: Thunderbird 1.5.0.10 (X11/20070314)
MIME-Version: 1.0
To: Kris Kennaway <kris@obsecurity.org>
References: <200704100452.40574.mail@maxlor.com>	<1176391950.1820.3.camel@rnoland-ibm.acs.internap.com>	<461E5F39.1030603@gmx.de>
	<200704122056.51123.mail@maxlor.com>	<461E8919.1080702@gmx.de>
	<20070414000031.GA90090@xor.obsecurity.org>
In-Reply-To: <20070414000031.GA90090@xor.obsecurity.org>
X-Enigmail-Version: 0.94.0.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit
X-Y-GMX-Trusted: 0
Cc: Benjamin Lutz <mail@maxlor.com>, ports@freebsd.org,
	Robert Noland <rnoland@2hip.net>, pav@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: Sat, 14 Apr 2007 05:12:29 -0000

Kris Kennaway wrote:
> On Thu, Apr 12, 2007 at 09:31:37PM +0200, [LoN]Kamikaze wrote:
> 
>>> Btw, do you think it's possible that a port can only be built with, n 
>>> parallel make jobs, but will fail with n+1?
>> No. I do not think this can be the case.
> 
> It certainly is the case.  If a makefile has incorrectly specified
> dependencies then it may build by accident for certain values of n.
> There are also lots of ports with race conditions which means they may
> sometimes build but not always.

I am aware of the theoretical existence of such problems, but has that ever actually happened? In my experience the port fails whenever something is wrong. I've never had a case where a port that didn't work because of 'make -j' worked when I tried again or with a different number of jobs.