From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Thu, 10 Jan 2008 22:03:19 GMT
Subject: Re: Decompression speed: zip vs lzo
Message-ID: <alpine.LFD.1.00.0801101400550.3148@woody.linux-foundation.org>
In-Reply-To: <478691EB.1080704@vilain.net>



On Fri, 11 Jan 2008, Sam Vilain wrote:
> 
> For reference, 20 years of Perl with very deep deltas:
> 
> wilber:~/src/perl-preview$ du -sk .git
> 73274   .git
> wilber:~/src/perl-preview$ git-repack -a
> Counting objects: 244360, done.
> Compressing objects: 100% (55493/55493), done.
> Writing objects: 100% (244360/244360), done.
> Total 244360 (delta 181061), reused 244360 (delta 181061)
> wilber:~/src/perl-preview$ du -sk .git/objects/pack/
> 75389   .git/objects/pack/

Hmm. I'm not sure I understand what this was supposed to show?

You reused all the old deltas, and you did "du -sk" on two different 
things before/after (and didn't do a "-a -d" to repack the old pack 
either). So does the result actually have anything to do with any 
compression algorithm?

Use "-a -d -f" to repack a whole archive.

			Linus