I've read the Upstart features and it says nothing about concurrency.
I also read old advices to set CONCURRENCY value in the
But there is a comment:
Specify method used to enable concurrent init.d scripts. Valid options are 'none', 'startpar' and 'makefile'. To enable the concurrent boot option, the init.d script order must allow for concurrency. This is not the case with the default boot sequence in Debian as of 2008-01-20. Before enabling concurrency, one need to check the sequence values of all boot scripts, and make sure only scripts that can be started in parallel have the same sequence number, and that a scripts dependencies have a earlier sequence number. See the insserv package for a away to reorder the boot automatically to allow this.
And the CONCURRENCY is set to none.
insserv is installed in my Ubuntu 11.04. But is it used?
My system is already amazingly fast because it's on the SSD. But I'd like to know if it uses all cores during boot.