Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.2 9/17/84; site twitch.UUCP
Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!mhuxn!ihnp4!twitch!grt
From: grt@twitch.UUCP ( G.R.Tomasevich)
Newsgroups: net.lang.c
Subject: pack vs. compress
Message-ID: <288@twitch.UUCP>
Date: Tue, 4-Mar-86 16:07:01 EST
Article-I.D.: twitch.288
Posted: Tue Mar  4 16:07:01 1986
Date-Received: Fri, 7-Mar-86 03:52:04 EST
Distribution: net
Organization: AT&T Bell Labs, Holmdel
Lines: 26
Keywords: UNIX 5.2, VAX

These are the two we have.  I used a 564-block (285684 bytes) file of
station message detail records, which has mostly digits and spaces.  Each
line is a record of telephone call info from a field experiment.  The
system in 5.2 on a VAX-11/785 with a heavy load, according to a system
monitor running in a layer on my Blit.  Both real time ~ 45 sec.

command		compression	comp size	user	sys
  -		original	564 blks	 -	 -
pack		57.8%		239 blks	7.33s	2.70s
compress	78.27%		131 blks	8.38	1.96s

I have over 4k blocks of these compressed files, so the advantage of
compress is obviously worthwhile.

Another example is binary data from a terminal in the field experiment;
real time 112 sec and 77 sec respectively:

command		compression	comp size	user	sys
  -		original	1466 blks	 -	 -
pack		65.3%		 510 blks	17.46s	9.46s
compress	89.50%		 163 blks	17.51s	5.00s

We have tens of thousands of blocks (compressed) of these.
-- 
	George Tomasevich, ihnp4!twitch!grt
	AT&T Bell Laboratories, Holmdel, NJ