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diff --git a/system/lrzip/README b/system/lrzip/README new file mode 100644 index 0000000000..7d23e7d25f --- /dev/null +++ b/system/lrzip/README @@ -0,0 +1,23 @@ +lrzip (Long Range ZIP or Lzma RZIP) is a file compression program designed +to do particularly well on very large files containing long distance redundancy. + +lrztar is a wrapper for lrzip to simplify compression and decompression +of directories. lrzip uses an extended version of rzip which does a first pass +long distance redundancy reduction. The lrzip modifications make it scale +according to memory size. The data is then either: +1. Compressed by lzma (default), zpaq, lzo, gzip or bzip2. +2. Left uncompressed and rzip prepared. + +The major disadvantages are: +1. The main lrzip application only works on single files so it requires the + lrztar wrapper to fake a complete archiver. +2. It requires a lot of memory to get the best performance out of, and is not + really usable (for compression) with less than 256MB. Decompression requires + less ram and works on smaller ram machines. +3. It works on stdin/out but in a very inefficient manner generating temporary + files on disk so this method of using lrzip is not recommended. +4. Files compressed on a 64 bit OS with a compression window greater than 20 + (2 GB) may not decompress on a 32 bit OS. + +See the file README.benchmarks for performance examples and what kind of data +lrzip is very good with. |