Date: Fri, 24 Nov 2006 08:04:17 +0100 From: Rink Springer <rink@FreeBSD.org> To: Jason Evans <jasone@FreeBSD.org> Cc: arch@freebsd.org, John Birrell <jb@what-creek.com> Subject: Re: Proposed change to make -j Message-ID: <20061124070417.GA63991@rink.nu> In-Reply-To: <45663D0A.7010508@FreeBSD.org> References: <20061123232035.GA56985@what-creek.com> <45663D0A.7010508@FreeBSD.org>
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--xHFwDpU9dbj6ez1V Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, Nov 23, 2006 at 04:30:02PM -0800, Jason Evans wrote: > John Birrell wrote: > >Currently 'make -j' reports an error if the number of jobs > >isn't specified. > > > >I'd like to change make(1) to treat -j (without a number) as > >meaning "set the number of jobs to the number of processors". > > > >On sun4v, each processor isn't too powerful and system performance > >is only decent when you use all the processors - 32 in my case. > > > >I've been working on a parallel 'make release' process which > >would benefit from having -j set by default. At the moment I > >set MAKEFLAGS=3Dj32 in my environment and this achieves the desired > >result, but -j would be more general. >=20 > For gmake, a bare -j says to not limit the number of simultaneous jobs.= =20 > I don't think that it's a good idea to use a flag name that already=20 > has a different (and potentially useful) meaning for gmake. >=20 > I have some concern that no matter what number of jobs you decide to run= =20 > simultaneously when your proposed flag is specified (N, N+1, 2N, etc.,=20 > where N is the number of CPUs), that choice will not be universally=20 > useful, since the best choice of argument to -j depends on what 'make'=20 > is building. Might it be better to use sysctl(8) in your command line? >=20 > make -j `sysctl -n hw.ncpu` What about 'make -j0'? This current gives an error message... --=20 Rink P.W. Springer - http://rink.nu "It's you isn't it? THE BASTARD OPERATOR FROM HELL!" 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