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Paq

May 26, 2018

Family of archivers with extremely high compression ratios

paq is a family of archivers with the best lossless compression ratios now available across a wide variety of test data, according to several benchmarks. A comparison of paq to other compression methods, on a 2GHz T3200, when compressing a large text file

Format Size Time sec Memory comp decomp ———– ——— ————– ——- Uncompressed 3,152,896 compress 1,319,521 1.6 0.2 .1 MB gzip -9 1,022,810 0.7 0.1 .1 MB bzip2 -9 860,097 0.6 0.4 5 MB p7zip 7z 824,573 1.5 0.1 195 MB xz -6 822,016 ? ? ? zpaq c1 fast 806,959 2 2 38 MB zpaq c2 mid 699,191 8 8 112 MB zpaq c3 max 644,190 20 20 246 MB

The port uses the open ZPAQ specification, and contains a public-domain C++ API for reading and writing ZPAQ compressed data to or from files or objects in memory; serial and multi-threaded archivers; extra preprocessors for compression; and stubs for creating self-extracting archives.

WWW http//mattmahoney.net/dc/zpaq.html