Re: A simple request (was Re: boring BK stats)

Rogier Wolff
2002-10-11T13:30:07Z

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.

Roger.

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