Last Updated on July 14, 2023
Plzip is a massively parallel (multi-threaded) lossless data compressor based on the lzlib compression library, with a user interface similar to the one of lzip, bzip2 or gzip.
Plzip can compress/decompress large files on multiprocessor machines much faster than lzip, at the cost of a slightly reduced compression ratio (0.4 to 2 percent larger compressed files). Note that the number of usable threads is limited by file size; on files larger than a few GB plzip can use hundreds of processors, but on files of only a few MB plzip is no faster than lzip.
When compressing, plzip divides the input file into chunks and compresses as many chunks simultaneously as worker threads are chosen, creating a multimember compressed file.
When decompressing, plzip decompresses as many members simultaneously as worker threads are chosen.
- Automatically uses the smallest possible dictionary size for each file without exceeding the given limit.
- Uses the lzip file format; the files produced by plzip are fully compatible with lzip-1.4 or newer, and can be rescued with lziprecover.
- lzip format provides very safe integrity checking and some data recovery means.
- Preserves the access and modification dates, permissions, and, when possible, ownership of the file just as “cp -p” does.
- Can read from some types of non regular files.
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