Thats a good point. Now it worked really fast. But then the questions is why should I use pbzip2 for decompression with portage? I think most tarballs are packed only with the normal compression algorithm! The WIKI articel pretends a gain of speed which wont be!
Florian Philipp schrieb: > On Sun, 2008-01-27 at 10:58 +0100, Justin wrote: > >> Hey guys! >> >> Yesterday I found this article >> http://gentoo-wiki.com/HOWTO_Speed_up_decompression_with_pbzip2 and >> was very happy, because I'm an owner of an Q6600. >> >> So I tried to reproduce the benchmark from the wiki article but got >> that bad results: >> >> test # time bzip2 -d -kf linux-2.6.23.tar.bz2 >> >> real 0m11.672s >> user 0m11.306s >> sys 0m0.367s >> >> >> test # time pbzip2 -d -p4 -kf linux-2.6.23.tar.bz2 >> >> real 0m25.554s >> user 0m24.862s >> sys 0m0.683s >> >> So the parallel version took more than the double time! >> >> To test whether this is a problem of my Pc I tested this on an Dual >> Core with the same result. >> >> An test with 7z was much better: >> >> >> test # time 7za x -y linux-2.6.23.tar.bz2 >> >> real 0m4.642s >> user 0m8.379s >> sys 0m0.327s >> >> > > >> So my questions is what did I do wrong? >> > > > Did you compress it with pbzip2 in the first place? > > Pbzip2 can only speed up decompression of files created by pbzip2, as > well. Read the docs, dude ... > > p7zip has got its own implementation of bzip2, which might be faster. > -- gentoo-user@lists.gentoo.org mailing list
