Pripona .bz2

[Michal Vitecek]

On 15 Dec 1997, Leos Bitto wrote:
> On Mon, 15 Dec 1997, Derfinak Jan wrote:
> 
> > On Mon, 15 Dec 1997, Marek Picka wrote:
> > 
> > > Co to je? Jsou tim nove komprimovany kernely, a jsou asi o 20% mensi nez .tar.gz.
> > > 
> > > Jakej program to produkuje?
> > > 
> > 
> > bzip2
> > 
> > 					jano
> > 
> > PS: Nasiel som to pri zdrojakoch egcs na ftp.cygnus.org.
> > 
> 
> Oficialni homepage je http://www.muraroa.demon.co.uk.
> 
> Leos Bitto

  bzip2 je ale dost pomaly a vyzaduje hodne pameti, viz:

>From babydr na nwrain.net Mon Dec 15 13:20:57 1997
Date: Mon, 15 Dec 1997 00:15:11 -0800 (PST)
From: "Mr. James W. Laferriere Network Engineer" <babydr na nwrain.net>
To: Linux Kernel Maillist <linux-kernel na vger.rutgers.edu>
Cc: jseward na acm.org
Subject: Bzip2 vs Gzip & some thoughts.


	Hello All, I started with a gcc-2.7.2.1.tar ball for
	a resonably large example.  And here is what I got.

ls -l *.tar*
-rw-r--r--   1 root     root     28211200 Dec 14 22:54 gcc-test.tar1
-rw-r--r--   1 root     root     28211200 Dec 14 22:55 gcc-test.tar2

/usr/bin/time -o bzip2.test --append  bzip2 gcc-test.tar1
208.65user 1.83system 3:54.24elapsed 89%CPU 
(0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (6632major+1632minor)pagefaults 0swaps
ls -l *.tar*
-rw-r--r--   1 root     root      5303302 Dec 14 22:54 gcc-test.tar1.bz2
-rw-r--r--   1 root     root     28211200 Dec 14 22:55 gcc-test.tar2

/usr/bin/time -o bzip2.test --append  gzip gcc-test.tar2
86.58user 2.14system 1:39.40elapsed 89%CPU 
(0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (6971major+89minor)pagefaults 0swaps
ls -l *.tar*
-rw-r--r--   1 root     root      5303302 Dec 14 22:54 gcc-test.tar1.bz2
-rw-r--r--   1 root     root      7132305 Dec 14 22:55 gcc-test.tar2.gz

/usr/bin/time -o bzip2.test --append  bunzip2 gcc-test.tar1.bz2
50.62user 3.00system 1:02.76elapsed 85%CPU 
(0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (1370major+1127minor)pagefaults 0swaps
ls -l *.tar*
-rw-r--r--   1 root     root     28211200 Dec 14 22:54 gcc-test.tar1
-rw-r--r--   1 root     root      7132305 Dec 14 22:55 gcc-test.tar2.gz

/usr/bin/time -o bzip2.test --append  gunzip gcc-test.tar2.gz
8.02user 2.47system 0:16.14elapsed 64%CPU 
(0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (1816major+34minor)pagefaults 0swaps
ls -l *.tar*
-rw-r--r--   1 root     root     28211200 Dec 14 22:54 gcc-test.tar1
-rw-r--r--   1 root     root     28211200 Dec 14 22:55 gcc-test.tar2

	Original size / Bzip2 (compressed) = 5.319553
Compressing	208.65user 1.83system 3:54.24elapsed 89%CPU 
UnCompressing	50.62user 3.00system 1:02.76elapsed 85%CPU 
Compressing	Elapsed = 234.24 sec
UnCompressing	Elapsed =  62.76 sec

	Original size / Gzip  (compressed) = 3.955411
Compressing	86.58user 2.14system 1:39.40elapsed 89%CPU 
UnCompressing	8.02user 2.47system 0:16.14elapsed 64%CPU 
Compressing	Elapsed =  99.40 sec
UnCompressing	Elapsed =  16.14 sec

	1.344879 = 134.4879 % better compression. ( Nice :-)
	But takes 2.356539 times longer to achieve this. (:-})
	And takes 3.888475 times longer to UnCompress than gzip. (:-})

	AMD5k86-p90, 64MB Mem(60ns)

 				Tia, JimL

			fuf


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