Date: Mon, 2 Jun 2003 17:07:32 -0400 (EDT) From: Andrew Gallatin <gallatin@cs.duke.edu> To: Gordon Tetlow <gordont@gnf.org> Cc: arch@FreeBSD.org Subject: Re: Making a dynamically-linked root Message-ID: <16091.48276.54493.198345@grasshopper.cs.duke.edu> In-Reply-To: <20030602201337.GD87863@roark.gnf.org> References: <20030602171942.GA87863@roark.gnf.org> <16091.44150.539095.704531@grasshopper.cs.duke.edu> <20030602201337.GD87863@roark.gnf.org>
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Gordon Tetlow writes: > On Mon, Jun 02, 2003 at 03:58:46PM -0400, Andrew Gallatin wrote: > > > > Gordon Tetlow writes: > > > > > > There will be a performance hit associated with this. I did a quick > > > measurement at boot and my boot time (from invocation of /etc/rc to > > > the login prompt) went from 12 seconds with a static root to 15 > > > seconds with a dynamic root. I have yet to perform a worldstone on > > > it. > > > > Wow! That's a 25% pessimization. I'm afraid that other heavily > > scripted and or fork intensive environments may fair just as poorly > > (dynamic web content, SMTP servers, etc) as the startup scripts. > > You need to realize that with the advent of rcNG that their are alot > of additional shell invocations. Also bear in mind that your dynamic In the boot scripts. I agree that the time to boot is not a concern. My main concern is other scripting intensive areas of the system which you may not have measured. > web content and SMTP servers are already going to be dynamically linked. Sure, but if they're using shell scripting at all, then the applications they invoke may not be. /bin/sh and /bin/ls, for example. > In fact, the thing that will be hardest hit will be the boot scripts. If that's true, then that's fine. However, if you propose making such a big change, then I think the burden is on you to prove that it will not impact other areas of the system. I look forward to seeing the worldstones, preferrably from a -j4 or higher build. If there's not a measurable slowdown there, then I'll shutup. Thanks, Drew
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