Date: Wed, 9 Aug 2006 17:31:58 -0500 From: "Nikolas Britton" <nikolas.britton@gmail.com> To: "Matthias Andree" <matthias.andree@gmx.de> Cc: freebsd-stable@freebsd.org Subject: Re: gzip is faster with -O3 Message-ID: <ef10de9a0608091531n7d605bb5s49e266b13da6b855@mail.gmail.com> In-Reply-To: <m3ejvqat8n.fsf@merlin.emma.line.org> References: <ef10de9a0608090649k78d87350v638b2d3f1432e735@mail.gmail.com> <m3ejvqat8n.fsf@merlin.emma.line.org>
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On 8/9/06, Matthias Andree <matthias.andree@gmx.de> wrote: > > 1. gzip isn't usually used to compress incompressible data. > > 2. use "time" to figure out how much CPU time it actually burns. > 5 GB are somewhat I/O bound, but gcc options don't help with that, so > CPU time is better than wallclock time. > dd if=/dev/zero of=testfile bs=1m count=5000 gzip comiled with -O3 # time nice -10 ./gzip -c9 testfile > /dev/null 73.187u 8.682s 2:08.41 63.7% 70+617k 40161+0io 0pf+0w gzip compiled with -O2 # time nice -10 ./gzip -c9 testfile > /dev/null 61.183u 8.468s 2:00.14 57.9% 58+609k 40162+0io 0pf+0w Now... what do all of those numbers mean, I've never used time before... thanks for the tip btw? -- BSD Podcasts @: http://bsdtalk.blogspot.com/ http://freebsdforall.blogspot.com/
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