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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
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