Date: Thu, 25 Jul 2019 18:09:52 +0200 From: Dimitry Andric <dim@FreeBSD.org> To: mike tancsa <mike@sentex.net> Cc: freebsd-stable@freebsd.org Subject: Re: Buildworld times (was Re: svn commit: r350256 - in stable/12: . contrib/compiler-rt/lib/sanitizer_common contrib/libunwind/src contrib/llvm/lib/DebugInfo/DWARF contrib/llvm/lib/MC contrib/llvm/lib/Object contrib/llvm/lib/Ta...) Message-ID: <2B4E531D-F26E-4615-8F46-0869ED951138@FreeBSD.org> In-Reply-To: <C9E884D6-0FA1-4F3B-A3C5-3ECD2E01FD0F@FreeBSD.org> References: <201907231840.x6NIeWeq024894@repo.freebsd.org> <b085970b-4e20-6802-182a-c6c976b4fc05@sentex.net> <0CB72C19-405C-41F0-8967-96F363228ED6@FreeBSD.org> <f428eb69-ae82-2255-19ce-3b81e8c68f6e@sentex.net> <8373E39A-46E7-41AB-BC1F-8CDF65F47287@FreeBSD.org> <b07742fd-2d3a-3ada-7066-6e5762e64473@sentex.net> <801c0dd8-7a50-d93f-77f6-999aaa91a295@sentex.net> <C9E884D6-0FA1-4F3B-A3C5-3ECD2E01FD0F@FreeBSD.org>
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--Apple-Mail=_4F215892-CF6F-42E3-8E97-AD3526648F00 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii On 24 Jul 2019, at 23:21, Dimitry Andric <dim@FreeBSD.org> wrote: >=20 > On 24 Jul 2019, at 22:56, mike tancsa <mike@sentex.net> wrote: >>=20 >> On 7/24/2019 1:21 PM, mike tancsa wrote: >>> On 7/24/2019 12:02 PM, Dimitry Andric wrote: > ... >>> # cat /etc/src.conf /etc/make.conf >>> MK_SYSTEM_COMPILER=3Dno >>> MK_SYSTEM_LINKER=3Dno >>> KERNCONF=3Dserver >>> MK_SYSTEM_COMPILER=3Dno >>> MK_SYSTEM_LINKER=3Dno >>=20 >> Hmmm, is the logic reversed somehow ? The good news is if nothing is >> defined, it does the right thing. >=20 > The idea is that the default is to *not* bootstrap the compiler, if = the > system compiler is new enough. E.g. if you build r350256 from a = system > built before r350256, it will normally automatically bootstrap > everything. >=20 > E.g., your previous builds did not have to bootstrap, and now they do, > which is why they take longer. >=20 > So the only good way to compare is to force MK_SYSTEM_COMPILER=3Dyes = and > MK_SYSTEM_LINKER=3Dyes, so both buildworlds will do the same thing. >=20 > I did a few tests on a relatively fast machine, and buildworld with > those settings on took approximately the same time at r350255 and > r350256. I'm now repeating those experiments to feed the results to > ministat. Repeating buildworld 3 times for r350255 and r350256 (with both MK_SYSTEM_COMPILER and MK_SYSTEM_LINKER set to "yes") shows no difference in measured real time, according to ministat: $ head real-*.txt =3D=3D> real-r350255.txt <=3D=3D 1562.12 1587.61 1582.78 =3D=3D> real-r350256.txt <=3D=3D 1574.50 1559.20 1584.50 $ ministat real-*.txt x real-r350255.txt + real-r350256.txt = +-------------------------------------------------------------------------= -----+ |+ x + x + x = | | = |_________|____________________A___M______A____________M______|___________= _|| = +-------------------------------------------------------------------------= -----+ N Min Max Median Avg = Stddev x 3 1562.12 1587.61 1582.78 1577.5033 = 13.539477 + 3 1559.2 1584.5 1574.5 1572.7333 = 12.742187 No difference proven at 95.0% confidence -Dimitry --Apple-Mail=_4F215892-CF6F-42E3-8E97-AD3526648F00 Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc Content-Description: Message signed with OpenPGP -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.2 iF0EARECAB0WIQR6tGLSzjX8bUI5T82wXqMKLiCWowUCXTnUUAAKCRCwXqMKLiCW o3mbAJ9gFtY+hANVirvpUzLTfIBYiD0EMgCgklhCHCXNgMcNq+X1NEoyYGf4qDE= =vXit -----END PGP SIGNATURE----- --Apple-Mail=_4F215892-CF6F-42E3-8E97-AD3526648F00--
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