Date: Mon, 8 May 2017 20:25:40 +0200 From: "O. Hartmann" <ohartmann@walstatt.org> To: "Ngie Cooper (yaneurabeya)" <yaneurabeya@gmail.com> Cc: "O. Hartmann" <ohartmann@walstatt.org>, FreeBSD CURRENT <freebsd-current@freebsd.org> Subject: Re: filemon: weird full-time build although filemon enabled Message-ID: <20170508202540.470321ac@thor.intern.walstatt.dynvpn.de> In-Reply-To: <557CD2F0-4E32-41EE-A0A9-DF5D8C189E83@gmail.com> References: <20170506092255.083828f8@thor.intern.walstatt.dynvpn.de> <557CD2F0-4E32-41EE-A0A9-DF5D8C189E83@gmail.com>
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[-- Attachment #1 --] Am Mon, 8 May 2017 11:23:01 -0700 "Ngie Cooper (yaneurabeya)" <yaneurabeya@gmail.com> schrieb: > > On May 6, 2017, at 00:22, O. Hartmann <ohartmann@walstatt.org> wrote: > > > > I build CURRENT on two technically similar systems on a almost daily basis. > > Therefore, it was a great relief having WITH_META_MODE=yes set in /etc/src-env.conf > > for incremental builds. To make my understanding of this clear (just in case I'm > > wrong): setting WITH_META_MODE builds only portions that does not need to be build in > > the make context. > > > > Well, the reason writing this email is: on one system, I run almost every reboot into > > a "full build" and this puzzles me a bit. The long-lasting and time exhausting builds > > are within the LLVM/CLANG tree. They consume a lot of time. The box in question does > > have a weak CPU, only two physical cores, four threads, 8GB of RAM and builds > > the /usr/obj residing on a SSD. The reference machine does have the same motherboard, > > also a SSD, but has 16 GB RAM and a 4-core/8 threads XEON CPU - but both are > > "IvyBridge". The XEON usually needs 30 - 40 minutes to compile a full world/kernel > > from a clean /usr/obj, the "weak" box takes approximately 120 minutes - it is > > understandable that a shortage of the build time is appreciated. > > > > Well, having said this, I need to mention that both systems use almost > > identical /etc/src.conf setting - except the order of appearance of the WITH_ tags. In > > fact, they are identical except the KERNCONF (naming of the kernel) and > > PORTS_MODULES=, the "weak" box incorporates x11/nvidia-driver and > > emulators/virtualbox-ose-kmod, so these modules are build every time the system gets > > rebuild, but the time taken by those is negligible. > > > > The problem: to make my point clear: the "weak" box starts compiling almost everytime > > now the LLVM/CLANG tree while the XEON box does not. This is spooky. > > > > I deleted on both systems recently /usr/obj completely from its content and > > restarted a buildworld again to hope, that the problem was introduced due to some > > files necessary for the BSD make environment to indicate the incremental build. But > > no success. Even more spooky is the fact, that after a build on the "weak" box and a > > build again, the box bevaves as expected not rebuilding everything again, but in some > > cases after a reboot, a rebuild the hits again the build of LLVM/CLANG tree, while > > the XEON box does not. > > > > I think there is something missing an I'd like to ask what is the suggested way to > > initially restart a full build to ensure that WITH_META_MODE gets initialised > > correctly. > > > > Well, I'm not a developer, so please be patient with my naive report. > > > > Thanks in advance, > > Dumb question: which kernel are you using on which machine (GENERIC, > GENERIC-NODEBUG, a custom kernel with or without debug hooks, e.g., INVARIANTS, > enabled)? Also, how are you building the system (locally using UFS or ZFS, remotely, > e.g., over NFS, etc)? Thanks, -Ngie - Custom kernel - as far as I know, no debug hooks, no INVARIANTS (i tried to eliminate all of them) - Build is performed on a Samsung SSD 850 PRO with UFS2, locally -- O. Hartmann Ich widerspreche der Nutzung oder Übermittlung meiner Daten für Werbezwecke oder für die Markt- oder Meinungsforschung (§ 28 Abs. 4 BDSG). [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- iLUEARMKAB0WIQQZVZMzAtwC2T/86TrS528fyFhYlAUCWRC4JAAKCRDS528fyFhY lOoOAf0fDa2HjHvxsiQGPI/qf/pIqqM6yUC9oTOQuuJxd69NuZ4sc49qSa5n+lKI r1+HXi59UM3KxwQHneCpSHEtLcePAf9Jx9Z+1kkHSIWPHQcEzFtczdTqQ9MXOiqH 2WZMrcskK5TbGGNiX0OlRQn4AX3Dfx3wMHZtfVVitVRngIEzA8yi =ktkP -----END PGP SIGNATURE-----
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