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Date:   Wed, 4 Jul 2018 10:21:20 +1000
From:   Stephen Rothwell <sfr@canb.auug.org.au>
To:     Randy Dunlap <rdunlap@infradead.org>
Cc:     Andrew Morton <akpm@linux-foundation.org>,
        Norbert Manthey <nmanthey@amazon.de>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        David Woodhouse <dwmw@amazon.co.uk>,
        linux-kernel@vger.kernel.org
Subject: Re: [build-check] scripts: add check_build script
Message-ID: <20180704102120.591e1074@canb.auug.org.au>
In-Reply-To: <01151c44-c3f7-c344-8e58-2e6b348960fb@infradead.org>
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        <1530623539-650-1-git-send-email-nmanthey@amazon.de>
        <20180703154914.5d3e8f28e1d87e48180073e3@linux-foundation.org>
        <01151c44-c3f7-c344-8e58-2e6b348960fb@infradead.org>
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Hi all,

On Tue, 3 Jul 2018 16:27:06 -0700 Randy Dunlap <rdunlap@infradead.org> wrot=
e:
>
> 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=3D"$1"
> >> +	local -i STATUS=3D0
> >> +
> >> +	make clean -j $(nproc) &> /dev/null
> >> +	make -j $(nproc) &>> "$LOG_FILE" || STATUS=3D$?
> >> +
> >> +	echo "build status: $STATUS" >> "$LOG_FILE"
> >> +	echo "[$SECONDS] build status: $STATUS"
> >> +	return "$STATUS"
> >> +} =20
> >=20
> > The script never sets nproc.  So I guess this is a bare `make -j'.=20
> > 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.=20
> > After a 20 minute nap (thanks!) it was still comatose so I hit the big
> > button (who writes this junk??).
> >=20
> > So you might want to take an educated guess from /proc/cpuinfo here. =20
>=20
> or use
> nproc=3D`getconf _NPROCESSORS_ONLN`
>=20
> 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.
--=20
Cheers,
Stephen Rothwell

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