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Wed 19th Jun 13 12:42
Concurrent Booting, make full use of your multi-core processors during boot time.
This is an easy way to make full use of your multi-core processors during boot time.
Open a Terminal (Applications->Accessories->Terminal) and type the following:
sudo gedit /etc/init.d/rc
Now look for CONCURRENCY=none and change it to CONCURRENCY=shell
When finished save the file and reboot to see if its working…. 
5 Responses to Concurrent Booting, make full use of your multi-core processors during boot time.
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i timed my system from selection of o/s at grub to login screen in both ubuntu 9.04 and winxp pro:
avg time ubuntu w/o concurrent processing: 27.97s
avg time ubuntu w/concurrent processing: 27.7s
avg time winxp: 38.5s
should i see more of a difference?
amd athlon 64 x2 6000+ AM2
4gb ram (3.4gb recognized)
wd raptor 36gb
no overclocking
You are right indeed this is a great way to make full use of your multi-core processors during boot time. It’s for the multi-core processors to work properly….
My bad. Thanks for the notice
will make some adjustments/rewrite the article a.s.a.p.
You will not notice any difference when running Ubuntu this tweak is only to use 2 processors instead of 1 during the boot proces.
Concurrency in this case means, that the boot-system tries to start those boot scripts at the same time that have no dependencies to each other.
You should only activate this feature, if all scripts, started at boot-time support this "feature".
This option has nothing to do with multiple cores of your cpu.
Article updated and modified on 23 September 2009