From owner-svn-src-head@FreeBSD.ORG  Sun Jul  7 21:15:03 2013
Return-Path: <owner-svn-src-head@FreeBSD.ORG>
Delivered-To: svn-src-head@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115])
 by hub.freebsd.org (Postfix) with ESMTP id 1312F39A;
 Sun,  7 Jul 2013 21:15:03 +0000 (UTC)
 (envelope-from alfred@freebsd.org)
Received: from elvis.mu.org (elvis.mu.org [192.203.228.196])
 by mx1.freebsd.org (Postfix) with ESMTP id 00C0616E5;
 Sun,  7 Jul 2013 21:15:02 +0000 (UTC)
Received: from Alfreds-MacBook-Pro-9.local
 (c-67-180-208-218.hsd1.ca.comcast.net [67.180.208.218])
 by elvis.mu.org (Postfix) with ESMTPSA id F235E1A3C1A;
 Sun,  7 Jul 2013 14:15:01 -0700 (PDT)
Message-ID: <51D9DA55.2090808@freebsd.org>
Date: Sun, 07 Jul 2013 14:15:01 -0700
From: Alfred Perlstein <alfred@freebsd.org>
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7;
 rv:17.0) Gecko/20130620 Thunderbird/17.0.7
MIME-Version: 1.0
To: Garrett Cooper <yaneurabeya@gmail.com>
Subject: Re: svn commit: r253002 - head
References: <201307072039.r67KdCdR028908@svn.freebsd.org>
 <9D4C7540-A3B0-45E5-8219-6A455D41DF70@gmail.com>
In-Reply-To: <9D4C7540-A3B0-45E5-8219-6A455D41DF70@gmail.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Cc: "svn-src-head@freebsd.org" <svn-src-head@freebsd.org>,
 "svn-src-all@freebsd.org" <svn-src-all@freebsd.org>,
 "src-committers@freebsd.org" <src-committers@freebsd.org>
X-BeenThere: svn-src-head@freebsd.org
X-Mailman-Version: 2.1.14
Precedence: list
List-Id: SVN commit messages for the src tree for head/-current
 <svn-src-head.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/svn-src-head>,
 <mailto:svn-src-head-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/svn-src-head>
List-Post: <mailto:svn-src-head@freebsd.org>
List-Help: <mailto:svn-src-head-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/svn-src-head>,
 <mailto:svn-src-head-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 07 Jul 2013 21:15:03 -0000

On 7/7/13 2:01 PM, Garrett Cooper wrote:
> Why the magic number 12?

Numbers higher seem to result in worse performance as reported by some 
members of my team.

-Alfred

>
> Sent from my iPhone
>
> On Jul 7, 2013, at 1:39 PM, Alfred Perlstein <alfred@FreeBSD.org> wrote:
>
>> Author: alfred
>> Date: Sun Jul  7 20:39:11 2013
>> New Revision: 253002
>> URL: http://svnweb.freebsd.org/changeset/base/253002
>>
>> Log:
>>   Document tip on how to build all kernels quickly.
>>
>> Modified:
>>   head/Makefile
>>
>> Modified: head/Makefile
>> ==============================================================================
>> --- head/Makefile    Sun Jul  7 19:58:14 2013    (r253001)
>> +++ head/Makefile    Sun Jul  7 20:39:11 2013    (r253002)
>> @@ -32,6 +32,12 @@
>> # targets             - Print a list of supported TARGET/TARGET_ARCH pairs
>> #                       for world and kernel targets.
>> # toolchains          - Build a toolchain for all world and kernel targets.
>> +#
>> +# "quick" way to test all kernel builds:
>> +#    _jflag=`sysctl -n hw.ncpu`
>> +#    _jflag=$(($_jflag * 2))
>> +#    [ $_jflag -gt 12 ] && _jflag=12
>> +#    make universe -DMAKE_JUST_KERNELS JFLAG=${jflag}
>> #
>> # This makefile is simple by design. The FreeBSD make automatically reads
>> # the /usr/share/mk/sys.mk unless the -m argument is specified on the
>> _______________________________________________
>> svn-src-head@freebsd.org mailing list
>> http://lists.freebsd.org/mailman/listinfo/svn-src-head
>> To unsubscribe, send any mail to "svn-src-head-unsubscribe@freebsd.org"