Date: Thu, 6 Dec 2012 00:51:17 +0100 From: Damien Fleuriot <ml@my.gd> To: Warner Losh <imp@bsdimp.com> Cc: "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org>, Ryan Stone <rysto32@gmail.com>, FreeBSD Current <freebsd-current@freebsd.org>, AndreOppermann <andre@freebsd.org> Subject: Re: kernel module parallel build? Message-ID: <20E25F79-2C53-45FD-BB7F-060AC9B26245@my.gd> In-Reply-To: <0EC857C9-4C1B-467D-8499-B493401B64BC@bsdimp.com> References: <5083D84E.50903@freebsd.org> <201212041052.51476.jhb@freebsd.org> <CAFMmRNzmfHcC3S%2BFfh2YjWDdzr=ddHEggrg%2Biyjjfc6COKdKSw@mail.gmail.com> <201212051142.18361.jhb@freebsd.org> <0EC857C9-4C1B-467D-8499-B493401B64BC@bsdimp.com>
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On 5 Dec 2012, at 18:39, Warner Losh <imp@bsdimp.com> wrote: >=20 > On Dec 5, 2012, at 9:42 AM, John Baldwin wrote: >=20 >> On Tuesday, December 04, 2012 2:41:32 pm Ryan Stone wrote: >>> On Tue, Dec 4, 2012 at 10:52 AM, John Baldwin <jhb@freebsd.org> wrote: >>>=20 >>>> Hmm, I certainly see the module directories being built in parallel. S= ome >>>> of >>>> the make jobs may not be as obvious since links are silent (no output >>>> unless >>>> there is an error). >>>>=20 >>>>=20 >>> This is definitely not the behaviour that I see trying to build any vers= ion >>> of FreeBSD. I see the same behaviour as Andre: the depend and all targe= ts >>> both iterate through the module directories sequentially. It never buil= ds >>> two module subdirectories concurrently. >>=20 >> Hmm, I think I was confused by seeing kernel builds intermingle with the=20= >> associated modules. sys/modules/Makefile uses bsd.subdir.mk. I think I s= ee=20 >> similar things in world builds where I will see parallel builds of bin vs= sbin=20 >> vs usr.bin vs usr.sbin, but within each of those directories the builds g= o=20 >> sequentially. I think you would need to change bsd.subdir.mk if you want= to=20 >> fix this. >=20 > The builds are in parallel, just that the parallelism is low because it is= only parallel within the module being built. Would love to see a fix. >=20 > Warner >=20 All trolling aside, I believe an awesome fix to be setting module override i= n /etc/make.conf to only build the 4-5 specific modules one needs. To be honest I think this configuration tweak should be advertised a bit mor= e as it definitely speeds up kernel builds. I would be happy to check if this is advertised in the handbook in the "rebu= ilding kernel" section and enhance its visibility if required. I can provide en_US and fr_FR.=
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