Le vendredi 24 août 2012 à 10:10 +0100, Jon Dowland a écrit : > > Most compressors work on a block-cipher model in order to support stream > operation and so the compressor doesn't have a global view of the data being > compressed. At least with 7zip and xz, you can tweak the block size directly and at least LZMA, Deflate, PPMd are able to do multiple pass.
> That's why subsequent manual passes can (sometimes) have a good > effect, especially with e.g. enormous log files with a lot of repetition: > local > areas of the file being compressed are treated in isolation, but the resulting > compressed blocks have a lot of (compressed!) repetition. In practise it's > almost certainly very rarely worth bothering. That makes sense. AFAIK, you can't manually set the block size with gzip which is a shame for non-streamed files. -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/1345800669.4875.24.ca...@p76-nom-gd.cnrs-imn.fr
