linux-kernel - Re: [build-check] scripts: add check

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Date:   Wed, 4 Jul 2018 10:21:20 +1000
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Norbert Manthey <nmanthey@...zon.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        David Woodhouse <dwmw@...zon.co.uk>,
        linux-kernel@...r.kernel.org
Subject: Re: [build-check] scripts: add check_build script

Hi all,

On Tue, 3 Jul 2018 16:27:06 -0700 Randy Dunlap <rdunlap@...radead.org> wrote:
>
> On 07/03/2018 03:49 PM, Andrew Morton wrote:
> > On Tue, 3 Jul 2018 15:12:10 +0200 Norbert Manthey <nmanthey@...zon.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.
-- 
Cheers,
Stephen Rothwell

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