From: Nicolas Pitre <nico@cam.org>
To: Olivier Galibert <galibert@pobox.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Linus Torvalds <torvalds@osdl.org>, Petr Baudis <pasky@suse.cz>,
Git Mailing List <git@vger.kernel.org>
Subject: Re: Historical kernel repository size
Date: Fri, 15 Sep 2006 12:45:53 -0400 (EDT) [thread overview]
Message-ID: <Pine.LNX.4.64.0609151232370.2627@xanadu.home> (raw)
In-Reply-To: <20060915090305.GC75256@dspnet.fr.eu.org>
On Fri, 15 Sep 2006, Olivier Galibert wrote:
> On Thu, Sep 14, 2006 at 09:19:04PM -0400, Nicolas Pitre wrote:
> > Erm... Both incantations work fine fine here.
> >
> > > -rw-rw-r-- 1 tglx ftpadmin 13600376 Sep 14 22:16 pack-4d27038611fe7755938efd4a2745d5d5d35de1c1.idx
> > > -rw-rw-r-- 1 tglx ftpadmin 158679705 Sep 14 22:16 pack-4d27038611fe7755938efd4a2745d5d5d35de1c1.pack
> >
> > And I get the same result as well.
>
> For the curious, a 100/100 parameter gives a size of 154261771.
Right. And then the runtime cost of extracting objects out of such a
pack increases due to the deeper delta chain.
The average runtime cost is probably linear with the delta depth,
something like f(x) = a*x + k.
But the size reduction follows f(x) = a/x + k.
So to say that infinite delta length does not provide infinite packing
size reduction. Anything larger than 50 is probably not worth the
small reduction gain.
Nicolas
prev parent reply other threads:[~2006-09-15 16:46 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-09-14 14:22 Historical kernel repository size Petr Baudis
2006-09-14 14:38 ` tglx
2006-09-14 15:38 ` Andy Whitcroft
2006-09-14 15:52 ` Shawn Pearce
2006-09-14 15:52 ` Petr Baudis
2006-09-14 15:31 ` Linus Torvalds
2006-09-14 21:23 ` Nicolas Pitre
2006-09-14 21:32 ` Thomas Gleixner
2006-09-14 21:37 ` Thomas Gleixner
2006-09-14 21:42 ` Nicolas Pitre
2006-09-14 21:54 ` Thomas Gleixner
2006-09-14 22:24 ` Thomas Gleixner
2006-09-14 23:15 ` Junio C Hamano
2006-09-15 1:19 ` Nicolas Pitre
2006-09-15 9:03 ` Olivier Galibert
2006-09-15 16:45 ` Nicolas Pitre [this message]
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