Re: Faster boot by running init.d scripts in parallel

[Olivier Bonvalet <debian.list@daevel.fr>]

But combined with "readahead", there is no I/O bound during init.
Most of needed files are preload.

Wouter Verhelst a écrit :
> On Thu, Sep 10, 2009 at 01:05:32PM +0200, Petter Reinholdtsen wrote:
>   
> > 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.
> >     
>
> That seems suboptimal.
>
> It occurs to me that initscripts are mostly I/O bound (since they need
> to start applications that then go waiting in the background), rather
> than CPU bound; as such, the number of initscripts that can be ran in
> parallel is more dependent on I/O speed than on CPU speed.
>
> It's probably best to make this N be a configurable variable (possibly
> defaulting to something based on something we detect from the system
> we're running on) rather than have it be something detected and not
> configurable.
>
> If it actually is configurable, but you just didn't tell us so, then
> please feel free to disregard this mail ;-)
>
>