Re: Boot Dependancies - a weird wacky wonderful new idea

[Philip Hands <phil@hands.com>]

> Parallelized booting. What this means is we run multiple bootup scripts
> simultaneously. It's a *lot* faster on mid-to-higher-end machines, even
> with just one CPU - it'd be wickedly fast with SMP.

I like it.

This sounds like a job for make (which can run things in parallel)

It shouldn't be too much trouble to come up with a few make rules that (on an 
unmodified system) run all the rc scripts, one at a time, in the same order, 
as they would be run now (for backward compatibility).

Then, as you make scripts parallel-isable, you do something[1] so that make can 
pick up on the real dependencies (rather that the over-cautious default it 
would have used), and your done.

This way, new scripts on an old system work as normal.

Old scripts with a new paraliasble make based /etc/init.d/rc script work fine
too.

You can use make's load/job limiting options to tune the best number of things 
to run at once.

The only problem I see with this is making it survive things like file 
corruption in the Makefiles, but I guess corrupted init scripts are fairly bad 
news as it is, so that's not making thinks much worse.

Cheers, Phil.

[1] like make /etc/init.d/deps/[KS]packagename be makefile fragments that
    get included into the master makefile.



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