Parallellizing the boot in Debian Squeeze - ready for wider testing
These days, the init.d script dependencies in Squeeze are quite
complete, so complete that it is actually possible to run all the
init.d scripts in parallell based on these dependencies. If you want
to test your Squeeze system, make sure dependency based boot
sequencing is enabled, and add this line to /etc/default/rcS:
CONCURRENCY=makefile
That is it. It will cause sysv-rc to use the startpar tool to run
scripts in parallel using the dependency information stored in
/etc/init.d/.depend.boot, /etc/init.d/.depend.start and
/etc/init.d/.depend.stop to order the scripts. Startpar is configured
to try to start the kdm and gdm scripts as early as possible, and will
start the facilities required by kdm or gdm as early as possible to
make this happen.
Give it a try, and see if you like the result. If some services fail
to start properly, it is most likely because they have incomplete
init.d script dependencies in their startup script (or some of their
dependent scripts have incomplete dependencies). Report bugs and get
the package maintainers to fix it. :)
Running scripts in parallel could be the default in Debian when we
manage to get the init.d script dependencies complete and correct. I
expect we will get there in Squeeze+1, if we get manage to test and
fix the remaining issues.
If you report any problems with dependencies in init.d scripts to the
BTS, please usertag the report to get it to show up at
<URL: http://bugs.debian.org/cgi-bin/pkgreport.cgi?users=initscripts-ng-devel@lists.alioth.debian.org >.
Happy hacking,
--
Petter Reinholdtsen
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