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Date: Fri, 11 Oct 2002 16:08:28 +0200
From: Rogier Wolff <R.E.Wolff@BitWizard.nl>
To: Rogier Wolff <R.E.Wolff@BitWizard.nl>
Cc: Larry McVoy <lm@work.bitmover.com>, Jeff Garzik <jgarzik@pobox.com>,
       Walter Landry <wlandry@ucsd.edu>, linux-kernel@vger.kernel.org
Subject: Re: A simple request (was Re: boring BK stats)
Message-ID: <20021011160828.B345@bitwizard.nl>
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On Fri, Oct 11, 2002 at 03:35:38PM +0200, Rogier Wolff wrote:
> On Thu, Oct 10, 2002 at 07:28:18AM -0700, Larry McVoy wrote:
> > > The laptop has 200MB RAM, and mozilla and a ton of xterms loaded.  IDE 
> > > drives w/ Intel PIIX4 controller.  The Dual Athlon has 512MB RAM, and I 
> > > forget what kind of IDE controller -- I think AMD.  IDE drives as well.
> > > 
> > > BitKeeper must scan the entire tree when doing a checkin or checkout, so 
> 
> [...]
> 
> > In low memory situations you really want to run the tree compressed.  
> > ON a fast machine do a "bk -r admin -Z" and then clone that onto your
> > laptop.  I think that will drop the tree to about 145MB which will
> > help, maybe.  I suspect that you use enough of the rest of your 200MB
> > that it still won't fit.
> 
> [...]
> > There is only so much we can do when you are trying to cram 10 pounds of
> > crap in a 5 pound bag :(
> 
> The reason that one or two years ago my "diff+multiple trees" beat
> bitkeeper on the performance front was that diff would only touch
> inode-metadata, and not the files themselves. You can cache the
> file-metadata (inodes) of a 200M tree in a couple of megabytes of RAM.

Jeff: 

The trick is that I would have hardlinked trees. Thus 

	linux-2.2.18.clean/drivers/char/tty_ioctl.c
and
	linux-2.2.18.rio/drivers/char/tty_ioctl.c

would have the same inode number, and diff wouldn't even bother to
open the file.... 

				Roger. 

-- 
** R.E.Wolff@BitWizard.nl ** http://www.BitWizard.nl/ ** +31-15-2600998 **
*-- BitWizard writes Linux device drivers for any device you may have! --*
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* excursion: The stable situation does not include humans. ***************
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