Date: Fri, 2 May 2003 15:33:34 +1000 From: Tim Robbins <tjr@FreeBSD.ORG> To: Ruslan Ermilov <ru@freebsd.org> Cc: current@freebsd.org Subject: Re: HEADS UP: bzip2(1) compression for manpages, Groff and Texinfo docs Message-ID: <20030502153334.A70914@dilbert.robbins.dropbear.id.au> In-Reply-To: <20030502011307.GA82420@sunbay.com>; from ru@freebsd.org on Fri, May 02, 2003 at 04:13:07AM %2B0300 References: <20030502011307.GA82420@sunbay.com>
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On Fri, May 02, 2003 at 04:13:07AM +0300, Ruslan Ermilov wrote:
> This is just an announcement that I'm going to add bzip2(1)
> support to man(1) and makewhatis(1) (catman(1) already has
> it), and then switch the default compression method from
> gzip(1) to bzip2(1), for manpages, Groff and Texinfo docs.
> (The latest 4.5 texinfo supports bzip2.)
I don't mean to sound rude, but what is the justification for this?
An extremely rough test:
$ time bzip2 -c sh.1 | wc -c
16099
0.24s real 0.21s user 0.03s system
$ time gzip -c sh.1 | wc -c
18036
0.12s real 0.10s user 0.01s system
bzip2 takes ~2 times as long as gzip and the resulting file with bzip2 is ~0.9
times the size of the gzip file.
bzip2 does not seem to perform significantly better on small files:
$ time gzip -c who.1 | wc -c
2168
0.03s real 0.00s user 0.00s system
$ time bzip2 -c who.1 | wc -c
2208
0.04s real 0.03s user 0.00s system
(These tests weren't conducted on a particularly fast machine by today's
standards:
CPU: Pentium/P55C (199.43-MHz 586-class CPU)
Origin = "GenuineIntel" Id = 0x544 Stepping = 4
Features=0x8001bf<FPU,VME,DE,PSE,TSC,MSR,MCE,CX8,MMX> )
Tim
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