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A comparison based on the debian source packages. Performed the summer 2002.
Packer Total size compression improvement from gz loss from best time (s)
tar 25764.5Mb 0 -2.42284 0.786226 0
gzip 7527.25Mb 0.707845 0 0.268287 41010.3
zzip 5987.13Mb 0.767621 0.204605 0.0800635 441934
szip 6501.28Mb 0.747666 0.1363 0.152816 37523.5
bzip2 6479.37Mb 0.748516 0.139211 0.149951 43998.6
PPMd2 8631.81Mb 0.664973 -0.146742 0.36192 36657.1
PPMd3 7199.65Mb 0.72056 0.0435215 0.234993 39515.3
PPMd4 6549.61Mb 0.74579 0.129879 0.159067 41225.7
PPMd5 6223.04Mb 0.758465 0.173265 0.114937 43005
PPMd6 6027.49Mb 0.766055 0.199245 0.0862218 44711.3
PPMd7 5892.44Mb 0.771297 0.217185 0.0652795 46276.5
PPMd8 5796.15Mb 0.775034 0.229978 0.0497504 47621.4
PPMd9 5731.01Mb 0.777562 0.238631 0.0389513 48880.5
PPMd10 5688.98Mb 0.779193 0.244215 0.0318506 50777.1
PPMd11 5661.65Mb 0.780254 0.247846 0.0271773 50990.6
PPMd12 5638.57Mb 0.78115 0.250912 0.0231944 51868.9
PPMd13 5625.2Mb 0.781669 0.252688 0.0208738 52697.2
PPMd14 5613.63Mb 0.782118 0.254225 0.0188553 53441
PPMd15 5609.34Mb 0.782285 0.254795 0.0181046 54141.2
PPMd16 5605.05Mb 0.782451 0.255366 0.0173525 54776.9
bzip2 = bzip2 -9
PPMdx = ppmd -o x -m220
compression = relative compression
improvement from gz = relative improvement from gzip compression
loss from best = relative size difference compared to using different compressors for each
package and using the individually best compressor for each package.
time(s) = total compression time
For more info about the internals of PPMd, se Dmitry Shkarin's article:
http://DataCompression.info/Miscellaneous/PPMII_DCC02.pdf
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