Init : someone could comment this ?
Les Mikesell
lesmikesell at gmail.com
Mon Jan 7 16:35:43 UTC 2008
Alan Cox wrote:
> On Mon, Jan 07, 2008 at 05:35:33AM +0000, Kevin Kofler wrote:
>> AFAIK, busybox still forks whereever a regular POSIX shell forks, so if the
>> amount of forks is the problem, AFAICT busybox will resolve absolutely nothing.
>
> Fork should be pretty cheap - although that depends how much memory is unshared
> by each of the resulting tasks. A smaller cleaner shell such as rc (which was
> designed for this job in plan 9) or ash might well perform better. I'm dubious
> it would be a big difference but someone can bench it.
If a unix-like system can't fork/exec at a rate suitable to handle
starting it's initial processes you should throw the whole system out
and start over, because it will be useless even after you get it
running. I think the real problem you need to solve is the number of
file opens that happen between boot up and the end of the init script
processing. This: http://kernelslacker.livejournal.com/35270.html
and the presentation on the topic at Oscon looked pretty horrible and
won't be fixed by using a dumber shell to parse the scripts. And note
that the suggestion to break out lines of configurations into individual
files for easier programmatic editing just compounds this already
serious problem.
--
Les Mikesell
lesmikesell at gmail.com
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