Thilo Six wrote the following on 17.12.2007 15:54 > atached is a more detailed analysis trying to compare gz, bz2 and 7z (aka > LZMA). > I tried it once for (mostly) textfiles as source and once on a binary file in > both compressing and extraction.
I did the comparion on binaries again. this time i extracted the .deb first (dpkg -x) cause this is what buildds do, too. $ dpkg -x openoffice.org-core_1%3a2.3.0-1ubuntu5.3_i386.deb oo/ $ du --max-depth=1 -k | grep oo 112724 ./oo ------------ compression ---------------- time: size ($ ls -lk): bz2 $ time tarbz2 oo.tar.bz2 oo/ 37188 real 0m46.918s user 0m45.503s sys 0m0.348s gz $ time targz oo.tar.gz oo/ 39084 real 0m14.278s user 0m13.337s sys 0m0.264s 7z $ time tar cf - oo/ | 7za a -si -m0=lzma oo-lzma.tar.7z real 2m23.783s user 2m21.409s 27358 sys 0m0.532s as you can see my first impression was right, 7z is slower but better in compression (pls remember compression once, extraction many!) then bz2. ------------ extraction ---------------- time: size ($ ls -lk): bz2 $ time untarbz2 oo.tar.bz2 112724 - matches orig real 0m14.170s user 0m12.901s sys 0m0.592s gz $ time untargz oo.tar.gz 112724 - matches orig real 0m3.174s user 0m1.916s sys 0m0.332s 7z $ time 7za x -so oo-lzma.tar.7z | tar xf - real 0m8.607s user 0m5.628s 112724 - matches orig sys 0m0.420s summary: at least 7z is faster in extraction than bz2, whereas the compressed 7z is only ~73,5% of the bz2 gz is the fastest, but produces the biggest compressed files. -- Thilo key: 0x4A411E09 -- Ubuntu-devel-discuss mailing list Ubuntu-devel-discuss@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-devel-discuss
