From owner-freebsd-current@freebsd.org  Tue May 31 04:47:17 2016
Return-Path: <owner-freebsd-current@freebsd.org>
Delivered-To: freebsd-current@mailman.ysv.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 by mailman.ysv.freebsd.org (Postfix) with ESMTP id 6B1C3B553EE
 for <freebsd-current@mailman.ysv.freebsd.org>;
 Tue, 31 May 2016 04:47:17 +0000 (UTC)
 (envelope-from alfred@freebsd.org)
Received: from elvis.mu.org (elvis.mu.org [IPv6:2001:470:1f05:b76::196])
 by mx1.freebsd.org (Postfix) with ESMTP id 5EE0D1B1B
 for <freebsd-current@freebsd.org>; Tue, 31 May 2016 04:47:17 +0000 (UTC)
 (envelope-from alfred@freebsd.org)
Received: from AlfredMacbookAir.local (unknown
 [IPv6:2601:645:8003:a4d6:5954:49d3:33ad:d196])
 by elvis.mu.org (Postfix) with ESMTPSA id ACB8B346DE89
 for <freebsd-current@freebsd.org>; Mon, 30 May 2016 21:47:11 -0700 (PDT)
Subject: Re: r300951 make buildworld duration 18h
To: freebsd-current@freebsd.org
References: <20160530143726.GA2418@c720-r292778-amd64.oa.oclc.org>
 <20160530144300.GW41922@home.opsec.eu>
From: Alfred Perlstein <alfred@freebsd.org>
Organization: FreeBSD
Message-ID: <574D174F.9030907@freebsd.org>
Date: Mon, 30 May 2016 21:47:11 -0700
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:38.0)
 Gecko/20100101 Thunderbird/38.7.2
MIME-Version: 1.0
In-Reply-To: <20160530144300.GW41922@home.opsec.eu>
Content-Type: text/plain; charset=windows-1252; format=flowed
Content-Transfer-Encoding: 7bit
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.22
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
 <freebsd-current.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-current>, 
 <mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current/>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-current>, 
 <mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 31 May 2016 04:47:17 -0000

It's too bad make(1) can't have a "max parallel jobs" for a particular 
directory.

I believe that some of the llvm build winds up using nearly a gig of RAM 
per compiled .c file, so when you are running 2 jobs at once, LLVM will 
swap like mad.

If we could add something under the llvm directory "max jobs = RAM/1GB" 
we could have much faster build worlds.

-Alfred

On 5/30/16 7:43 AM, Kurt Jaeger wrote:
> Hi!
>
>> Yesterday I pulled via svn co ... a fresh r300951 and started the
>> buildworld as
>>
>> # make -j2 buildworld
>>
>> it ended today at lunchtime after 18 hours. The laptop has
>> 2x Intel Atom 1.6GHz and 1 GByte RAM and was otherwise unused.
>> Is this the normal buildworld time of today?
> Yes, this sounds in line with similar setups.
>
>> I think it spent most of the time in building the llvm...
> Yes, llvm is a real hog.
>
> That's why I normally build on amd64 boxes...
>