[CentOS] Let's talk about compression rates

Sat Jan 22 15:56:09 UTC 2011
S Mathias <smathias1972 at yahoo.com>

wow...

http://pastebin.com/raw.php?i=ihLLHyiT


$ time 7z a -mx=9 linux-2.6.37.tar.7z linux-2.6.37.tar; echo; time xz -9 -z linux-2.6.37.tar; echo; ls -lS

7-Zip 9.13 beta  Copyright (c) 1999-2010 Igor Pavlov  2010-04-15
p7zip Version 9.13 (locale=en_US.utf8,Utf16=on,HugeFiles=on,2 CPUs)
Scanning

Creating archive linux-2.6.37.tar.7z

Compressing  linux-2.6.37.tar      

Everything is Ok

real    6m43.608s
user    10m1.092s
sys    0m3.957s


real    10m40.788s
user    10m33.363s
sys    0m2.106s

total 120264
-rw-rw-r--. 1 g g 61570448 Jan 22 15:42 linux-2.6.37.tar.xz
-rw-rw-r--. 1 g g 61567410 Jan 22 16:13 linux-2.6.37.tar.7z
$ 

--- On Sat, 1/22/11, cornel panceac <cpanceac at gmail.com> wrote:

From: cornel panceac <cpanceac at gmail.com>
Subject: Re: [CentOS] Let's talk about compression rates
To: "CentOS mailing list" <centos at centos.org>
Date: Saturday, January 22, 2011, 10:55 AM

2011/1/22 S Mathias <smathias1972 at yahoo.com>

http://pastebin.com/raw.php?i=MwDnhknf



$ ls -Sl

total 461252

-rw-rw-r--. 1 g g 111709730 Jan 22 11:06 linux-2.6.37.zip

-rw-rw-r--. 1 g g  93174605 Jan 22 11:03 linux-2.6.37.tar.gz

-rw-rw-r--. 1 g g  73552510 Jan 22 11:10 linux-2.6.37.tar.bz2

-rw-rw-r--. 1 g g  66333786 Jan 22 11:16 linux-2.6.37.7z

-rw-rw-r--. 1 g g  64035788 Jan 22 11:16 linux-2.6.37.tar.7z

-rw-rw-r--. 1 g g  63480808 Jan 22 11:20 linux-2.6.37.tar.xz

$



I presume kernel.org knows this. Why doesn't people use e.g.: XZ?



This is the same as in PDF's. DJVU files could be amazing too. They could compress [convert] a 400 MByte PDF to a 20 MByte DJVU. Amazing.



Why don't these technologies spread??
most have no idea about that.  do you know the level of compression used in .7z? 


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