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Date:      17 Jul 2000 02:50:08 +0200
From:      Cyrille Lefevre <clefevre%no-spam@citeweb.net>
To:        Kris Kennaway <kris@FreeBSD.org>
Cc:        Joachim =?iso-8859-1?q?Str=F6mbergson?= <watchman@ludd.luth.se>, clefevre@citeweb.net, stable@FreeBSD.org
Subject:   Re: Parallel kernel make  Was Re: kernel.debug (was Re: HEADS UP! Always use  the 'make buildkernel' target to make your kernels)
Message-ID:  <d7kdzikf.fsf@pc166.gits.fr>
In-Reply-To: Kris Kennaway's message of "Sun, 16 Jul 2000 15:27:04 -0700 (PDT)"
References:  <Pine.BSF.4.21.0007161525200.89152-100000@freefall.freebsd.org>

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Kris Kennaway <kris@FreeBSD.org> writes:

> On Sun, 16 Jul 2000, Joachim [iso-8859-1] Str=F6mbergson wrote:
>=20
> > Just for kicks I tried doing a 'make -j4 buildkernel' with KERNEL=3DSNP=
40
> > in /etc/make.conf and /boot/loader.conf. It works, that is the make
> > finished without crashing. I dunno if the binary works, nor if the
> > compile was substantially faster. So, superficially, parallel make of a
> > kernel does work.
>=20
> Yes, there is no reason why this should not work.
>=20
> > It sure consumed a lot of resources for a few minutes though. My SETI
> > run ran sloowly.
>=20
> Well, wouldn't you kind of expect this given what you asked the system to
> do (namely run 4 tasks at once)? However, -j4 is often slightly faster
> even on uniprocessor systems than -j1 (or "no -j") because it doesn't have
> to wait on Disk I/O. YMMV, of course.

I do make -j4 buildworld and kernel for month w/o any problems and is really
faster than -j1. even on a P166 uniprocessor.

Cyrille.
--=20
home:mailto:clefevre%no-spam@citeweb.net Supprimer "%no-spam" pour me repon=
dre.
work:mailto:Cyrille.Lefevre%no-spam@edf.fr Remove "%no-spam" to answer me b=
ack.


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