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Date:   Tue, 03 Jul 2018 21:07:32 -0700
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Subject: Re: [build-check] scripts: add check_build script
To:     Stephen Rothwell <sfr@canb.auug.org.au>,
        Randy Dunlap <rdunlap@infradead.org>
CC:     Norbert Manthey <nmanthey@amazon.de>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        David Woodhouse <dwmw@amazon.co.uk>,
        linux-kernel@vger.kernel.org
From:   Andrew Morton <akpm@linux-foundation.org>
Message-ID: <9A8BFC66-8723-4E33-B82F-BDF0DBE8133C@linux-foundation.org>
Sender: linux-kernel-owner@vger.kernel.org
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On July 3, 2018 5:21:20 PM PDT, Stephen Rothwell <sfr@canb.auug.org.au> wrote:
>Hi all,
>
>On Tue, 3 Jul 2018 16:27:06 -0700 Randy Dunlap <rdunlap@infradead.org>
>wrote:
>>
>> On 07/03/2018 03:49 PM, Andrew Morton wrote:
>> > On Tue, 3 Jul 2018 15:12:10 +0200 Norbert Manthey
><nmanthey@amazon.de> wrote:
>> >> +build ()
>> >> +{
>> >> +	local -r LOG_FILE="$1"
>> >> +	local -i STATUS=0
>> >> +
>> >> +	make clean -j $(nproc) &> /dev/null
>> >> +	make -j $(nproc) &>> "$LOG_FILE" || STATUS=$?
>> >> +
>> >> +	echo "build status: $STATUS" >> "$LOG_FILE"
>> >> +	echo "[$SECONDS] build status: $STATUS"
>> >> +	return "$STATUS"
>> >> +}  
>> > 
>> > The script never sets nproc.  So I guess this is a bare `make -j'. 
>> > When I type that on my (quite beefy) workstation I get eleventy
>xillion
>> > processes and the machine locks up.  Can't even wiggle the mouse. 
>> > After a 20 minute nap (thanks!) it was still comatose so I hit the
>big
>> > button (who writes this junk??).
>> > 
>> > So you might want to take an educated guess from /proc/cpuinfo
>here.  
>> 
>> or use
>> nproc=`getconf _NPROCESSORS_ONLN`
>> 
>> or double it if you want to keep processes ready/waiting.
>
>I have a program called nproc on my system.  It is part of coreutils.

Ohdoh, I misread, sorry.