Date: Wed, 14 Apr 2004 06:00:13 +1000 From: Peter Jeremy <PeterJeremy@optushome.com.au> To: Brian Reichert <reichert@numachi.com> Cc: current@freebsd.org Subject: Re: Optimizing RCng execution speed ? Message-ID: <20040413200013.GC53327@cirb503493.alcatel.com.au> In-Reply-To: <20040413160331.GM6308@numachi.com> References: <11095.1081621779@critter.freebsd.dk> <407B1EBC.6050405@freebsd.org> <407B234D.7070209@kientzle.com> <20040413160331.GM6308@numachi.com>
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On Tue, Apr 13, 2004 at 12:03:31PM -0400, Brian Reichert wrote: >On Mon, Apr 12, 2004 at 04:16:29PM -0700, Tim Kientzle wrote: >> Poul-Henning Kamp wrote: >> > >> >Is anybody working on optimizing RCng execution speed ? >> > >> >I think our boottime is getting a bit too slow these days... > >Would 'compiling' some/all of the scripts be useful? My gut feeling is "probably not". Most of the rc scripts are fairly trivial and amount to source configuration information and subroutines if action == "start" and my_config_variable != "NO" run some daemon elif action == "stop" and my daemon is running kill it endif The time-consuming bits are starting a new shell and sourcing the config files. The config files can't be (totally) compiled in because rc.conf needs to be user-configurable at runtime. In addition, the scripts themselves include magic comments used to define dependency ordering so they must still exist. If you feel that CCsh might help, why not whip up a prototype implementation and time it. As a general comment on this thread, my feeling is that optimising boot speed is not the most productive use of scarce developer time at present (though I agree it can be annoying if you need to reboot regularly to test fixes). If someone wants to have a look at this, the place to start is to profile the complete system during startup and see where the time is going. Peter
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