Jim Meyering <jim <at> meyering.net> writes: > > In case you're evaluating what compression programs to use... > > This started off as a comparison of xz and lzip, > but then I added lzrip to the mix.
> I started off by downloading the gcc-4.7.0.tar.bz2 release tarball > and decompressing it, then recompressing using bzip2, lzip, xz and lrzip: > (on a 6/12-core Fedora 17 x86_64 system with plenty of RAM) > > KiB compression > size time m:ss file name > ------ -------- ----------------- > 514400 NA gcc-4.7.0.tar > 80588 0:58.12 gcc-4.7.0.tar.bz2 (-9) > 59556 6:16.61 gcc-4.7.0.tar.lz (-9) > 58640 5:55.78 gcc-4.7.0.tar.xz (-9e) > 48876 2:46[*] gcc-4.7.0.tar.lrz (-z -L8 -w2000) > $ ./lrzip -d -o - gcc-4.7.0.tar.lrz > /dev/null > 3:36.12 (note, that's 3.5 *minutes* to decompress on a 12-core system) Nice to see you trying out lrzip. The -z option is really for extreme compression and not necessarily regular use (think permanent archival, distribution over slow connections), and definitely not for one time compression where the expectation is many people will be decompressing it and decompression speed is crucial. The default options would be a much better choice there where lrzip basically uses a multi-threaded lzma. Regards, Con
