From owner-cvs-all  Tue Feb  6 17:25:59 2001
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From: Luigi Rizzo <rizzo@aciri.org>
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Subject: Re: bzip2 (was cvs commit: ...)
In-Reply-To: <200102070106.f1716qt53369@mobile.wemm.org> from Peter Wemm at "Feb 6, 2001  5: 6:52 pm"
To: peter@netplex.com.au (Peter Wemm)
Date: Tue, 6 Feb 2001 17:21:09 -0800 (PST)
Cc: jkh@winston.osd.bsdi.com, jhb@FreeBSD.org, cvs-all@FreeBSD.org,
	cvs-committers@FreeBSD.org, sheldonh@uunet.co.za, obrien@FreeBSD.org,
	mi@aldan.algebra.com
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> ... The difference between bzip2 and gzip is like the difference
> between vi and emacs.

Ok, just to have a few numbers, i ran a comparative test:

	> time bzip2 < /kernel > /tmp/k.bz2
	7.497u 0.085s 0:07.65 98.9%     67+9683k 0+22io 0pf+0w
	> time gzip < /kernel > /tmp/k.gz
	1.916u 0.007s 0:01.98 96.4%     125+620k 0+22io 0pf+0w
	> ls -l /tmp/k*
	-rw-r--r--  1 rizzo  wheel  1242616 Feb  6 17:12 /tmp/k.bz2
	-rw-r--r--  1 rizzo  wheel  1282591 Feb  6 17:13 /tmp/k.gz

	> time gzip -d < /tmp/k.gz > /dev/null
	0.192u 0.000s 0:00.19 100.0%    121+640k 0+0io 0pf+0w
	> time bzip2 -d < /tmp/k.bz2 > /dev/null
	1.267u 0.031s 0:01.31 98.4%     66+4821k 0+0io 0pf+0w

there is still a huge difference in speed and memory, for a very
modest saving (less than 5%).
Yes, it really looks like the difference between vi and emacs :)

	> size `which vi` `which emacs`
	   text    data     bss     dec     hex filename
	 269477     976    3584  274037   42e75 /usr/bin/vi
	 622562 1249084       0 1871646  1c8f1e /usr/local/bin/emacs

		cheers
		luigi
----------------------------------+-----------------------------------------
 Luigi RIZZO, luigi@iet.unipi.it  . ACIRI/ICSI (on leave from Univ. di Pisa)
 http://www.iet.unipi.it/~luigi/  . 1947 Center St, Berkeley CA 94704
 Phone: (510) 666 2927
----------------------------------+-----------------------------------------


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