Am 08.07.2014 12:22, schrieb Jon Severinsson: > Am 06.07.2014 21:47, schrieb Lennart Poettering: >> BTW, have you checked whether reuseing the XZ context might make the XZ >> more competitive? > > On Sun Jul 6 15:01:11 PDT 2014 Reindl Harald wrote: >> please try a simple test compress 50 MB with XZ and GZ, LZO, LZ4 >> or BZIP2 - XZ is *magnitudes* slower in any case > > Actually it is not, or rather, it is only that if you want it to be that. > I did a quick comparison using the systemd 214 tar (30 MiB): > xz -0 was 28% slower than lz4c -hc, but the result was 19% smaller. > xz -0 was even 44% faster than gzip -9, and the result was still 5% smaller. > >> XZ is the wrong compression for anything where user feedback in time matters > > No, xz -6 is the wrong compression *setting* for that use-case, but at a > lower > setting xz is quite suitable even for that. > >> even with no care about memory usage which also is part of the game finally > > xz -0 needs about 3 MiB for compression, hardly a prohibitive requirement
you simply missed the benchmarks see topic "compress: add benchmark-style test" yesterday With 0: XZ: compressed & decompressed 2535300963 bytes in 33.01s (73.25MiB/s), ... LZ4: compressed & decompressed 2535303543 bytes in 1.31s (1838.75MiB/s), ..
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