I think this is interesting also for d-u. Hint: Petter Reinholdtsen is (one of) the maintainer of sysvinit and insserv. Regards, Andrei ----- Forwarded message from Petter Reinholdtsen <pere@hungry.com> ----- Date: Thu, 10 Sep 2009 13:05:32 +0200 From: Petter Reinholdtsen <pere@hungry.com> To: debian-devel@lists.debian.org Subject: Faster boot by running init.d scripts in parallel User-Agent: Mutt/1.5.19 (2009-01-05) Sender: Petter Reinholdtsen <petter.reinholdtsen@usit.uio.no> One "hidden" feature of the current Debian boot sustem, is the ability to run the init.d scripts in parallel. This require dependency based boot sequencing to be enabled, and the init.d script dependencies to be complete and correct to work reliably. The feature is hidden and undocumented, because we plan to drop the CONCURRENCY variable in the future and make concurrent booting the default when dependency based boot sequencing is enabled. If you want to test this feature in testing or unstable, use this command: echo CONCURRENCY=makefile >> /etc/default/rcS It will enable makefile style concurrency, and run N scripts in parallel during boot, where N is the number of CPUs or cores on the machine. This only work when dependency based boot sequencing. This can be enabled using dpkg-reconfigure insserv sysv-rc If some services fail to work properly, the problem is most likely because of bugs in the init.d script headers. See <URL: http://wiki.debian.org/LSBInitScripts/DependencyBasedBoot > for clues on how to fix it. Most scripts have correct enough dependency information, but help is needed to find and fix the remaning few with bugs. Please make sure to usertag reported bugs to make them show up on <URL: http://bugs.debian.org/cgi-bin/pkgreport.cgi?usertag=initscripts-ng-devel@lists.alioth.debian.org > If you want to improve boot speed even more, I recommend installing the readahead-fedora packages, and boot once with the 'profile' kernel option to adjust its readahead list to the list of files needed during boot. Happy hacking, -- Petter Reinholdtsen -- To UNSUBSCRIBE, email to debian-devel-REQUEST@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmaster@lists.debian.org ----- End forwarded message -----
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