SINGLE FILE TEST
Two of the files tested ("book1" and "obj2") were taken from the Calgary
Corpus, a popular benchmark for compression programs. These are a text
file and a binary object file, respectively.
Also tested was "xenomsgs" (a capture file from a BBS, consisting of
highly compressible information).
All files are sorted in order of best compression to worst compression.
[ ================================ "book1" ================================ ]
(From the Calgary Corpus - text taken from a book)
Original size: 768771 bytes
Program Compressed Compression Decompression
size time (s) time (s)
------------ --------------- ------------------ --------------
*LZX-2 265870 N/A N/A
LZX 1.20r -9 287230 33.55 0.75
LZX 1.20 -3 297568 12.11 0.77
LZX 1.20 -2 298232 11.64 0.77
LZX 1.20 -1 306744 8.75 0.77
Shrink 1.1 307320 33.61 18.63
Zip -9 312588 18.35 2.52
LhA 1.38e -2 338934 10.42 1.15
*available late 1995
[ ================================ "obj2" ================================ ]
(From the Calgary Corpus - object file)
Original size: 246814 bytes
Program Compressed Compression Decompression
size time (s) time (s)
------------ --------------- ------------------ --------------
*LZX-2 70290 N/A N/A
LZX 1.20r -9 73431 14.24 0.26
LZX 1.20 -3 75223 2.91 0.26
LZX 1.20 -2 75959 2.44 0.26
LZX 1.20 -1 78549 2.20 0.27
Shrink 1.1 79462 6.00 5.47
Zip -9 81170 7.04 0.72
LhA 1.38e -2 84943 3.55 0.32
[ ============================== "xenomsgs" ============================== ]
(Capture file from a BBS)
Original size: 876135 bytes
Program Compressed Compression Decompression
size time (s) time (s)
------------ --------------- ------------------ --------------
*LZX-2 178434 N/A N/A
LZX 1.20r -9 206909 79.07 0.67
LZX 1.20 -3 212423 9.97 0.67
LZX 1.20 -2 213681 8.99 0.67
LZX 1.20 -1 217239 7.45 0.67
Shrink 1.1 224354 19.13 15.03
Zip -9 241759 12.07 2.20
LhA 1.38e -2 301480 8.65 1.09