The Monday 22 December 2008 16:13:17 Eugene V. Lyubimkin, you wrote : > Thomas Preud'homme wrote: > > The Monday 22 December 2008 13:53:43 Eugene V. Lyubimkin, you wrote : > >> Volkan YAZICI wrote: > >>> Hi, > >>> > >>> Are there any compression tools in the official Debian GNU/Linux > >>> repositories that can take the benefit of multiple cores/cpus? > >> > >> pbzip2? > > > > I profit of this thread to ask you if you see amelioration with pbzip2. I > > made 2 tests on file of 50 MB and the result if approximately the same > > time as bzip2 (a little much longer with pbzip2 !!!) but a CPU twice time > > more used. I have a core 2 duo and time give me a usage of almost 200% > > with pbzip2 > > > > Anyone has better results ? > > Yes, see following: > > jackyf@work:~/temp$ time tar -cjf temp1.tar.bz2 debian > > real 0m18.830s > user 0m18.317s > sys 0m0.268s > jackyf@work:~/temp$ time bash -c "tar -cf - debian | pbzip2 -c > > temp2.tar.bz2" > > real 0m10.494s > user 0m19.557s > sys 0m0.488s > > 10 is much less than 18. Ok so sometime it works well. It would be great to know when it'll be quicker and when it will not. What kind of files are in your debian directory ? Regards, Thomas Preud'homme -- Why debian : http://www.debian.org/intro/why_debian
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