Date: Fri, 13 Oct 2006 11:54:20 -0700 (PDT) From: Matthew Dillon <dillon@apollo.backplane.com> To: Joerg Sonnenberger <joerg@britannica.bec.de> Cc: freebsd-hackers@freebsd.org Subject: Re: "tar -c|gzip" faster than "tar -cz"?!? Message-ID: <200610131854.k9DIsKTV026430@apollo.backplane.com> References: <452E8FDF.4050003@FreeBSD.org> <200610131345.k9DDjYkD030561@lurza.secnetix.de> <20061013175720.GA5150@britannica.bec.de>
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:On Fri, Oct 13, 2006 at 03:45:34PM +0200, Oliver Fromme wrote:
:> Meanwhile I had a quick look at the code: gzip uses some
:> optimized assembler code (for x86 and 680x0), while libz
:> doesn't have such a thing. Maybe that's the reason why
:> gzip is noticeably faster.
:
:I'm not sure what happened in the mean time, but when I did the tests in
:2004, libz was faster. *sigh* The assembly doesn't seem to help much, at
:least not the longest_match version. Might be a good idea to look at
:crc32, but I don't have the time now :-(
:
:Joerg
I very vaguely remember someone mentioning assembly optimized code
for our libz, or something... I don't remember precisely. I think
my response was along the lines of "as long as a C version always
works, knock yourself out".
-Matt
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