[gentoo-dev] Re: idea for speeding up the boot process in Gentoo..

[gentoo-dev] Re: idea for speeding up the boot process in Gentoo..

[COFFMAN Steven]

Starting all boot scripts as background processes can potentially lead to
some scripts starting before prerequisite ones have finished. For instance,
if your network hasn't come up yet, and you start network services.

Better solutions include Serel (www.fastboot.org) and Richard Gooch's fast
boot scripts: http://www.atnf.csiro.au/people/rgooch/linux/boot-scripts/

Currently, the trade off between flexibility of serel versus the
low-overhead of Richard's scripts has meant neither has been adopted over
the present standard. I've heard people suggest hybrid approaches like using
something like serel to generate something like Richard's scripts.

Anyway... back to lurking.

-Steve

[gentoo-dev] RE: idea for speeding up the boot process in Gentoo..

[COFFMAN Steven]

Sorry. Richard Gooch's scripts are here:
http://www.atnf.csiro.au/people/rgooch/linux/boot-scripts/

-Steve


-----Original Message-----
From:	COFFMAN Steven
Sent:	Fri 9/6/2002 9:09 AM
To:	gentoo-dev@gentoo.org
Cc:	
Subject:	Re: idea for speeding up the boot process in Gentoo.. 
Starting all boot scripts as background processes can potentially lead to
some scripts starting before prerequisite ones have finished. For instance,
if your network hasn't come up yet, and you start network services.

Better solutions include Serel (www.fastboot.org) and Richard Gooch's fast
boot scripts: http://www.atnf.csiro.au/people/rgooch/linux/boot-scripts/

Currently, the trade off between flexibility of serel versus the
low-overhead of Richard's scripts has meant neither has been adopted over
the present standard. I've heard people suggest hybrid approaches like using
something like serel to generate something like Richard's scripts.

Anyway... back to lurking.

-Steve

Re: [gentoo-dev] Re: idea for speeding up the boot process in Gentoo..

[Felipe Ghellar]

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If the init scripts could be organized like a tree of dependencies, at 
least each branch could be parallelized.


COFFMAN Steven wrote:
> Starting all boot scripts as background processes can potentially lead to
> some scripts starting before prerequisite ones have finished. For instance,
> if your network hasn't come up yet, and you start network services.
> 

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Re: [gentoo-dev] Re: idea for speeding up the boot process in Gentoo..

[Marko Mikulicic]

Felipe Ghellar wrote:
> If the init scripts could be organized like a tree of dependencies, at 
> least each branch could be parallelized.

It's not always a tree. It is a graph. A package can have multiple 
dependencies.
I think it could be possible to execute dependecies in parallel (the 
entire runlevel seen like
a script with the whole directory as a dependency) and waiting for 
completion. Once a script is running
other invocations will be queued.
  Of course this a simplistic view... :-) (reverse stoping, error 
handling,.... )

Marko

Re: [gentoo-dev] Re: idea for speeding up the boot process in Gentoo..

[Evan Read]

On Sat, 7 Sep 2002 12:07, Marko Mikulicic wrote:
> Felipe Ghellar wrote:
> > If the init scripts could be organized like a tree of dependencies, at
> > least each branch could be parallelized.
>
> It's not always a tree. It is a graph. A package can have multiple
> dependencies.
> I think it could be possible to execute dependecies in parallel (the
> entire runlevel seen like
> a script with the whole directory as a dependency) and waiting for
> completion. Once a script is running
> other invocations will be queued.
>   Of course this a simplistic view... :-) (reverse stoping, error
> handling,.... )
>

Possibly conflicts could be solved by running something like "rc-update 
optimise" where a script would "fake load" scripts to determine what could be 
parallelised and what couldn't.

Then each system would have its own load order based on its dependencies.  If 
one runs "rc-update" to say add mysql to the boot list, then the "optimise 
file" would be blown away and must be run again manually (unless in rc.conf 
or something ;).

Can anyone shoot this?

Evan

Re: [gentoo-dev] Re: idea for speeding up the boot process in Gentoo..

[Julien Cayzac]

On Sat, 7 Sep 2002 12:07, Marko Mikulicic wrote:
> Felipe Ghellar wrote:
> > If the init scripts could be organized like a tree of dependencies, at
> > least each branch could be parallelized.
>
> It's not always a tree. It is a graph. A package can have multiple
> dependencies.
> I think it could be possible to execute dependecies in parallel (the
> entire runlevel seen like
> a script with the whole directory as a dependency) and waiting for
> completion. Once a script is running
> other invocations will be queued.
>   Of course this a simplistic view... :-) (reverse stoping, error
> handling,.... )

You will find what you describe at http://www.fastboot.org/
It's called SEREL.

Regards,
Julien.