The Monday 22 December 2008 16:47:26 Eugene V. Lyubimkin, you wrote : > Thomas Preud'homme wrote: > > 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 ? > > There are some text files and some gzipped archives in it. I can try > another example if you want. No, don't. I'm just wondering why. Actually I did a test in the same order (bzip2 and the pbzip2) on a tar of my picture directory and on a video. I just don't understand why my 2 runs aren't much quicker with pbzip2. Regards, Thomas Preud'homme -- Why debian : http://www.debian.org/intro/why_debian
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