parallel booting init in C - even larger speedup

[Olaf van der Spek]

On 11/14/05, Petter Reinholdtsen <pere at hungry.com> wrote:
> [Olivier Sessink]
> >> I did not measure the boot speed, so I do not know if this speeded up
> >> the boot or not.  I hope to get to that soonish.
> >
> > there more programs you start with the same order number, the more
> > speedup you can expect from the parallel start.
>
> Perhaps.  That depend on the bottleneck.  If there are CPU or IO
> bottlenecks, parallel booting will not speed up the process much. :)

Isn't an IO bottleneck 'solved' by using readahead?
And even without readahead, generating IO requests earlier means the
HDD may be able to serve them in a more efficient order.