Summary of the multiple file compression benchmark tests


File type : Multiple file types (46 in total)
# of files to compress in this test : 510
Total File Size (bytes) : 316.355.757
Average File Size (bytes) : 620,305
Largest File (bytes) : 18,403,071
Smallest File (bytes) : 3,554

This test is designed to model 'real-world' performance of lossless data compressors. The test set contains a mix of different file types which are chosen with 'What do people use archivers for the most' in mind. The testset should contain data, weighted (in both type and proportion of files in the set) by how often these files are used for compression by normal users using compression software. So for example there will be more txt files then .ocx files in the set (yes, this is arbitrary). The set contains 100's of files and has a total size of over 300 Mb. The idea of a large collection is filtering out the 'noise'. A compressor might perform bad on 1 or 2 filetypes, but on a very large collection it will not hurt as much.

Some programs like CCM and BZIP2 can only compress one file at a time. For these programs a single TAR-file is created containing all files. The files in this TAR-file are ordered alphabetically on suffix, then name. Results of these compressors are marked with an 'Y' in the tarred column.

The testset consists of the following file types :

Filetype(s) Description % of total # of files
TOC, MBXEudora mailboxes12.31 16
EXE, DLL, OCX, DRVExecutables10.99 35
TXT, RTF, DIC, LNGText files in several languages10.21 41
BMP, TIFFBitmaps/TIF images7.88 15
LOGLog files6.34 6
HTM, PHPHTML files6.13 19
DOCMS Word files6.08 30
C, CPP, PAS, DCUSource Code6.00 235
MDB, CSVDatabases4.26 7
HLPWindows Help files4.23 7
CBF, CBGPrecompressed chess-databases3.55 2
WAVWave soundfiles3.45 9
XLSXLS Spreadsheets2.41 16
PDFAdobe Acrobat document1.59 6
TTFTrue Type Fonts1.15 15
DEFVirus definition files1.10 3
JPG, GIFImage files0.53 9
CHMPrecompressed help files0.49 2
INI, INFINI files0.42 10
OthersDAT,JAR,M3D,SYS,PPT,MAP,WP,RLL,RIB..10.88 27

Considering the fact it's supposed to be a 'real-world' test I will not look at the best possible (command-line or gui) switch combination to use for optimal compression, but only test a limited set as 'normal users' would do. For 7-zip this means for example I will use the GUI and select the Ultra compression method (which can be easily beaten with some good command line switches), WinRar will be tested with max dictionary size and solid archiving etc. Programs are allowed to use a maximum of 800 MB memory and must finish the compression stage within 12h. Compressed size must be 50% or less compared to the original size to be listed on MFC.

For my single file tests I got lots of requests to add the compression time to the tables. I did not do this for the reasons stated in the single file summary file, but I'm planning to measure compression times for this multiple file test!. I also decided to make this testset 'non public', so it's harder for developers to tune their program towards this specific test. I think this is the most fair way to get 'real life' performance tests.

Scoring system: The program yielding the lowest compressed size is considered the best program. The most efficient (read:use full) program is calculated by multiplying the compression + decompression time (in seconds) it took to produce the archive with the power of the archive size divided by the lowest measured archive size. The lower score the better. The basic idea is a compressor X has the same efficiency as compressor Y if X can compress twice as fast as Y and resulting archive size of X is 10% larger than size of Y. (Special thanks to Uwe Herklotz to get this formula right)


score_X = POWER(2; ((size_X / size_TOP) - 1) / 0,1) * time_X

with  score_X     efficiency score for a certain compressor X
      time_X      time elapsed by compressor X (comp + decomp time)
      size_X      archive size achieved with compressor X
      size_TOP    archive size by top archiver (smallest benchmark result)
Formula to calculate compressor efficiency based on compressed size and compression time
"0,1" represents 10% and power of 2 ensures that for each 10% worse results (compared
with top) the time is doubled, so any archiver (except top compressor) will get a
penalty on time. The score of top compressor is always equal to its time value.


Results sorted on Compression ratio.

Pos Program Switches used TAR Q6600 Compressed Compression Comp time Decomp time Efficiency
  Size (bytes) Ratio (%) (sec) (sec) lower is better
001PAQ8px-7NY6244373880.26
23427
2201945446
002PAQ8P-7NY6268317280.19
17976
1665335562
003WinRK 3.1.2MaximumNY6429424379.68
14265
1398534692
004PAQ8JC-6 (dir /oen)NN6619113979.08
18908
1621253237
005PAQAR 4.5-7e (dir /oen/b)NN6843571578.37
21322
2141083103
006WinRK 3.1.2HighNY6900345878.19
1311
9804745
007PAsQDa 4.4-7eNN6910918778.15
21101
2117388594
008NanoZip 0.09a-cc -m800mNY6985780377.92
464
4382054
009UDA 0.301(none)YY7147876777.41
3369
341218487
010DURILCA 0.5-m800 -t1NY7217557877.19
738
6574109
011Slim 0.23d-m800 -o64NY7366468376.71
1574
152910783
012WinUDA 0.291mode-3NY7373557476.69
3663
369125756
013Slim 0.23d(none)NY7378197276.68
1555
148610706
014KGB 1.1 (PAQ6)(very good)NY7534137576.18
7830
788965796
015NanoZip 0.09a-cONY7572069676.06
208
45.31106
016ZPAQ 2.05max.cfgNY7632855975.87
1107
111110359
017CCMx 1.30c6YY7707994975.64
130
1261300
018DURILCA 0.5(none)NY7760445375.47
947
95110213
019PPMonstr J-m800 -o32NY7769968675.44
587
5936417
020CCM 1.30c6YY7792692275.37
107
1031171
021UHARC 0.6b-mx -md32768 -mm+NY7834487675.24
278
2342991
022FreeARC 0.666-mxNY7840622075.22
83.9
33.5691
023PPMonstr J(none)NY7844386275.20
568
5736739
024CCM 1.30c(none)YY7859898075.15
102
981202
025LPAQ88YY7870418675.12
504
5076147
026WinRK 3.1.2NormalNY7888289075.07
157
33.51181
027PIMPLE2(none)YN7962815774.83
2195
220729654
028WinUDA 0.291mode-0NY7971066974.80
1178
118016031
029NanoZip 0.09a(none)NY7990552574.74
58.4
14.1504
030COMPRESSIA 1.0bmax sol dict 15 MbNN8069834074.49
803
99999764699
031FreeARC 0.666(none)NY8123495174.32
24.1
11.8289
032DURILCA light 0.5-m800 -t1NY8166647474.19
155
761951
033EPM r9-m800YY8193490974.10
980
98817126
034CMM4 0.2b26YY8243545873.94
302
3075603
035EPM r9(none)YY8272785273.85
903
90417172
036Ocamyd 1.66 test1-m8 -s0YN8288038573.80
4666
466490177
037BIT 0.7(none)YY8332188873.66
305
2986121
038SQUEEZ 5.63Ultra 32Mb M E SolidNY8356505873.59
181
29.62196
039Quark 0.95r-l7 -d25YN8367356773.55
2095
3822513
040RZM 0.07h(none)YY8403037473.44
244
19.92898
041SBC 0.970 rev3-m3 -b62NY8473617673.21
102
401686
042Quark 0.95r(none)YN8474131473.21
702
378782
043Ultra7z Opt 0.05(none)NY8493233573.15
406
40.25416
044UHARC 0.6b(none)NY8495450673.15
209
332945
045SBC 0.970 rev3-b9NY8574026572.90
60
331235
046FreeARC 0.666-m3NY8590588272.85
13.6
10.5326
047ASH 07-m800 -o60YY8622563272.74
3641
3639102003
048SBC 0.970 rev3(none)NY8624528872.74
57
331264
049WINZIP 14Zipx Best MethodNY8627646272.73
95
27.51726
050WinRAR 4.1b3Best solidNY8665821072.61
48.7
22.51047
051KGB 1.1 (PAQ6)(normal)NY8687845872.54
1133
115734498
0527-Zip 9.25aUltra LZMA2 64Mb 3thrNY8719804672.44
91.1
7.81544
053SQUEEZ 5.63Max 8Mb M E SolidNY8769535872.28
155.7
19.22885
054ENC 0.15abies -d256NN8795559072.20
3498
999991757147
055COMPRESSIA 1.0bsol dict 15 MbNN8815278472.13
86
622568
056CTXf 0.75-meNY8835799272.07
98.3
75.43084
057WinACE 2.69Max 4096Kb solid ace20NY8848521572.03
108
12.32166
058ACE 2.6-m5 -d4096NY8848603172.03
109
12.92195
0597-Zip 9.25aNorm LZMA2 16Mb ws=32 4thrNY8858041672.00
49.2
7.11024
060StuffIt 14.0Auto Inline L9 M30 BP ENY8931014271.77
35.4
89.82471
061TC 5.2 dev2(none)YY8946477871.72
458
46018428
062PIM 2.90Best + filtersNY8963993971.66
299
907962
063StuffIt 14.0BWT L3 M23 BPNY8968339171.65
32.3
78.22273
064WinACE 2.69Norm solid ace20NY8974271571.63
74
12.31787
065ENC 0.15-d256NN8975052871.63
1440
999992101919
066DGCA 1.10(none)NN8983430471.60
83
342447
067CTXf 0.75(none)NY9003888471.54
74.7
51.72704
068StuffIt 14.0Auto filetype L16 M30 BP ENY9012551571.51
30.1
672098
069777 0.04b1-mg -mu32NN9022947771.48
1067
59136231
070WinRAR 4.1b3Normal solidNY9036186671.44
36.2
4.7907
071777 0.04b1(none)NN9054438271.38
1215
63341820
072NanoZip 0.09a-cDpNY9063834871.35
20.7
9.1681
073WinRK 3.1.2FastestNY9082141171.29
30.9
23.71274
074LZPX(J) 1.2h-8YY9145135971.09
119
1185931
075FreeARC 0.666-m2NY9165002871.03
6.9
7.8376
076WinRAR 4.1b3NormalNY9199523170.92
29.7
4.6912
077Bee 0.7.9 bld 0316-m3 -d8 -sNN9200398070.92
654
65834912
078LZPX(J) 1.2h(none)YY9207518370.90
110
1115927
079FlashZIP 0.99b8-m2 -c7NY9263546970.72
65.3
16.72340
080Bee 0.7.9 bld 0316-m2 -d8NN9310349170.57
362
36821947
081CSC 3.2a6-m3YY9329546870.51
35.8
9.21382
082UFA 0.04b1-mg -mx -mu32NN9342829270.47
521
13820540
083DST 0.91b-meYY9356834770.42
275
18514562
084LZTurbo 0.95-59NY9364678470.40
126
7.24254
085SQUEEZ 5.63Norm 4Mb M E SolidNY9408262270.26
54.3
19.22463
086UFA 0.04b1(none)NN9417563870.23
350
4213275
087FlashZIP 0.99b8-m1NY9469008070.07
20.2
12.91187
088ACB 2.00cuNN9505528969.95
1056
110780761
089BOA 0.58b-m15 -sNN9508046869.95
773
78658372
090BMA 1.35b-m16m -ax -mxNN9528441869.88
101
616204
091PPMN 1.00b1 km-O9 -M:50 -DAYY9551381769.81
365
36528680
092LZPM 0.16(none)YY9552505169.80
448
20.818441
093BSSC 0.95a(none)YY9581121869.71
53.9
25.33216
094PPMVC 1.2-o16 -m256NN9652507169.49
128
14712087
095PPMd var J rev.1-m256 -o16NY9673751569.42
73
806885
096DURILCA light 0.5(none)NY9682356569.39
71
806861
097BOA 0.58b(none)NN9685751569.38
596
62055457
098BIX 1.00 b7-mdG -sNY9707914169.31
152
11.57642
099PPMVC 1.2(none)NN9715252069.29
82
1018624
100WINIMP 1.211 BEST MM 16Mb B=1020KbNY9723772769.26
72.3
14.14110
101SCM 0.01b(none)YY9737395869.22
4615
4645447233
102GRZipII 0.2.4-b8m -aYN9748413669.19
48
434449
1037-Zip 9.25aMax PPMD 64Mb ws=16NY9757374469.16
75.9
80.37713
104CABARC 1.00.0106-m LZX:21NY9769144469.12
187
13.410026
105Blizzard 0.24b(none)YN9829628268.93
60
525992
106MNZIP(none)YN9848804568.87
111
287597
107BMA 1.35b(none)NN9872890068.79
54
405277
108WinHKI 1.74HKI2 maxNN9877107568.78
123
12614043
109EPC 1.0-m256 -o18YY9879716468.77
156
999995665076
110QC 0.050(none)YY9905504468.69
308
12124970
111BALZ 1.15exYY9912375368.67
108
21.37584
112UHARC 0.6b-mz -md32768 -mm+NY9925115768.63
28.6
363843
113DC 0.99.307b-b4096NY9954659068.53
107
999996153492
114WINIMP 1.211 Normal MM 4Mb B=600KbNY9963886268.50
34.2
14.13000
115BIX 1.00 b7(none)NY9969443268.49
101
11.77042
116BioArc 1.9UltraNN9969905868.49
66
768878
117BA 1.01(none)YY9987309868.43
58.5
406278
118M03(none)YN9993465168.41
1356
221101205
119Tornado 0.4a-11YY9995983868.40
87
8.16120
120BioArc 1.9NormalNN10001277768.39
64
748933
121WinHKI 1.74HKI2 normNN10020800668.32
91
9412238
122UHBC 1.0-b4m -m3YY10062322068.19
190
16024246
123DARK 0.51-b128mNN10078545068.14
61
397053
124DARK 0.51(none)NN10087706268.11
60
386983
125BruteCM 0.1d(none)YN10090260068.10
107
16019078
126UHBC 1.0(none)YY10099006268.08
148
11819192
127JAR 1.02(none)NN10116907168.02
37
93386
128PPMN 1.00b1 km(none)YY10118137068.02
232
23434345
129QLFC 6.6wBS=8388608NN10121754468.01
693
3353722
130EPC 1.0(none)YY10125867067.99
92.6
100.314339
131DC 0.99.307b(none)NY10131422467.97
101
999997487039
132GRZipII 0.2.4(none)YN10168637067.86
48
457249
133M99 2.2.1-m 512mYN10174666267.84
86
7912948
134ZZIP 0.36c-mx -a -6mNN10239264367.63
1598
41138179
135BCM 0.12-b16YY10245033867.62
69.5
52.710369
136BSC 3.0.0(none)YY10259824967.57
19.6
15.33010
137PPMd var J rev.1(none)NY10274352567.52
49
569204
138QLFC 6.6w(none)NN10293827667.46
343
3033410
139BWMonstr 0.01(none)YY10307340767.42
6010
3372853058
140WinTurtle 1.60SolidNN10312967267.40
31
335856
141CABARC 1.00.0106-m LZX:17NY10314825667.39
89
13.29370
142DACT 0.8.42(none)YY10337871867.32
333
19.433146
143DST 0.91b(none)YY10338637467.32
104
3713274
144WinTurtle 1.60(none)NN10356765867.26
28
305571
145ABC 2.4(none)YY10366974467.23
424
9350225
146ZZIP 0.36c(none)NN10384540467.17
706
4173998
147Bicom 1.01(none)YN10394051367.14
826
838166586
148M1 0.3b-1text2.txtYY10437767667.01
75
7916184
149PACKET 0.91a-m6 -s9YY10454589166.95
153
7.617195
150QazaR 0.0 pre5-d9 -l7YY10486710566.85
362
9951151
151YBS 0.03f(none)YY10507408366.79
51
34.99753
152ASD 0.2.0-m5 -mdgNN10510974066.77
2425
163294995
153RZIP 2.1-9YN10530541866.71
65
2610600
154RZIP 2.1(none)YN10541772366.68
56
259554
155UC II 3.05(max compress)NY10562549666.61
157
10.520218
156Tornado 0.4a(none)YY10574292266.57
13.9
8.12690
157SZIP 1.12-b41 -o40YN10579318366.56
373
7755336
158RINGS 1.65YY10579651466.56
28.8
28.47036
159CHILE 0.3d(none)YN10607254266.47
345
6351752
160BBB ver1m512YN10636476166.38
12294
5111677772
161UC II 3.05-TTNY10637088066.38
73
11.111027
162WinHKI 1.74HKI1 maxNN10639121866.37
64
1810776
163SZIP 1.12(none)YN10656717966.31
55
3011390
164ShipInBottle 1.0 b17alg:ppm :mem:128NN10674242266.26
1620
1635444745
165QUAD 1.12xYN10696829166.19
71
2413310
166AI 1.1-mtNN10736515166.06
27097
377369492408
167YBS 0.03f-m16mYY10746234666.03
73.8
41.317035
168PPMX 0.07(none)YY10757558266.00
106
11132523
169HA 0.999ba21NN10763741465.98
373
14177566
170BZIP2 1.0.5(none)YY10772092365.95
48.7
14.19565
171HOOK 1.4800YY10778894265.93
128
12438673
172QazaR 0.0 pre5(none)YY10816597965.81
66.6
4417699
173QUAD 1.12(none)YN10821543465.79
44
2410942
174M99 2.2.1(none)YN10829487665.77
53
3113636
175ASD 0.2.0(none)NN10910136065.51
158
5637992
176Ocamyd 1.66 test1-m8 -s2YY10920010565.48
286
288103027
177KZIP 14-APR-2007(none)NY11069493265.01
1778
11.3379128
178TarsaLZP 21Aug2007(none)YN11099461464.91
39
4718839
179Comprox 0.3.0e20YY11139190464.79
63
34.222252
180SEMONE 0.6 b2(none)YN11144268664.77
81
1421871
181BZP 0.3(none)NN11148580264.76
16
177634
182WINZIP 14Enhanced DeflateNY11150329064.75
47.9
6.512609
183LHARK 0.4d-tobNY11187091564.64
59
11.116924
184THOR 0.96e5YY11227511264.51
12.6
3.84141
185SLUG X(none)YY11228638364.51
4.4
5.22427
186MAR-gNY11255478664.42
112
6.530866
187TURTLE 0.07(none)YN11264674964.39
37
3518947
188LHARK 0.4d(none)NY11343906364.14
26.5
10.110517
189XPv5c2YY11355439864.11
564
114.5197471
190LZ2A-Cb12 -Szd26YN11358889764.09
138
1945869
191LZTurbo 0.95-43YY11389820364.00
6.7
6.53991
192PKZIP 2.50-exxNY11402234763.96
19.8
12.49871
193ShipInBottle 1.0 b17alg:lzNN11405109163.95
481
22154691
194LZXQ 0.4normalYN11449298763.81
71
10857817
195PKZIP 2.50(none)NY11450126363.81
16
11.78955
196AMG 2.2(Max Compression)NN11466275863.76
97
9999932945907
197VuZip 1.8MaxNN11467960863.75
37
714509
198DZip 2.90-9NY11468849063.75
44.5
11.718551
199EAZEL 1.0(best)NN11472837063.73
41
816246
200CODEC 3.21(none)NN11476727563.72
27
2015650
201GZIP 1.2.4-9YY11485797763.69
35.1
9.915136
202ESP 1.92(none)NY11516457763.60
22.3
11.111623
203AIN 2.32-m1NY11517808263.59
22.6
13.212477
204VuZip 1.8DefaultNN11526112963.57
19
79145
205DZip 2.90(none)NY11526988263.56
18.4
10.610211
206LZ2A(none)YN11529898363.55
120
2049452
207File2Pack 2.0(none)NY11530590163.55
16.3
10.29368
208EAZEL 1.0(normal)NN11530976263.55
20
79549
209GZIP 1.2.4(none)YY11544296463.51
15.5
10.29224
210AIN 2.32(none)NY11558711563.46
17.7
10.510285
211 BCArchive 1.08.7(none)NN11582112463.39
19
1412352
212ARJ32 3.15(none)NY11610726563.30
25.8
10.614064
213ARJ 2.85(none)NY11610961263.30
35
10.217469
214WinXP (Built-in Zip)(none)NY11632401163.23
15.1
18.613338
215aPLib 0.43(none)NN11759676262.83
253
7118523
216SR3a(none)YN11818319962.64
23
2623839
217ALZip 7.0b1(normal)NN11849287762.54
17
812588
218HPACK 0.79a(none)NN12070201461.85
377
31262535
219Etincelle RC2(none)YY12177806661.51
3.9
3.65438
220SAR 1.0(none)NN12206742361.41
94
1178621
221SYMBRA 0.2-m5YN12212055861.40
1110
6701340701
222AR 1.0(none)YY12214734261.39
128.4
10.5104931
223Crush 0.01cfYY12309034761.09
13.9
3.814847
224DeepFreezer 1.06(none)NN12335035161.01
20
925038
225Chaos Comp 3.0(none)NN12368156060.90
31
834932
226YZX 0.04-sNY12368870160.90
30.7
23.248317
227Ocamyd 1.66 test1(none)YY12426269060.72
226
229434702
228THOR 0.96e3YY12458865660.62
3.8
3.97628
229WINZIP 14SuperFastNY12527905760.40
9
6.416470
230LCSSR 0.2-l9 -b6YN12637878760.05
2918
27856891230
231ULZ 0.02c6YY12795118159.55
30.8
3.749638
232HYPER 2.5(none)NN12843987059.40
24
1559241
233LZOP 1.02rc1-9YY12960173359.03
64
4.7118720
234Zhuff 0.2(none)YY13243059058.14
3.2
6.623183
235LZTurbo 0.95-22YY13277381858.03
2.7
518922
236ARX 1.0(none)NN13346419957.81
35
11122047
237QuickLZ 1.40b9mode3NY13397390957.65
10.1
4.741553
238CTW 0.1(none)YN13468738057.43
2661
285116751159
239Secura Archiver 1.7(none)NN13987634855.79
131
6740640
240CA-ZIP 3.4(none)YY14024776255.67
32.4
7.5224784
241AI 1.1(none)NN14025973555.66
3523
584652852078
242QPress 0.38b-L3YY14119460755.37
4.3
3.649438
243QPress 0.38b-L2YY14807067253.19
1.8
3.672496
244LZC 0.082YY14965190952.70
13.9
5.7313621
245BriefLZ 1.04(none)NY15161187652.08
5.2
7.9260559
246THOR 0.96e1YY15193695451.97
1.9
3.6113415
247LZW 0.2(none)YY15328952051.55
154
5.73826627
248LZOP 1.02rc1-1YY15499381451.01
3.7
3.4205556
249LZOP 1.02rc1(none)YY15538908950.88
3.7
3.5217801
250QuickLZ 1.40b9mode1NY15684000650.42
2.1
5.6273631
251BigCrunch 0.4a1(none)NN15750260050.21
546
147677338794
252CODER 1.1-ew 4194304NN15878862149.81
330
10819323559
253SRANK 1.0(none)YY16411092948.12
7.3
7.81202732
254WinXP (NTFS)(none)NY19082252939.68
5.4
7.419775154
255TESTSETNY3163557570.00
0
00


Green Compression Ratio (larger bar is better)   Red Compression Time (shorter bar is better)   Blue Efficiency Ratio (larger bar is better)

Remarks:
Ten programs so far crashed during compressing:
- Emilcont 0.3a
- RKC 1.02
- PPMZ2 0.81
- HIPP 0.5819
- OrangeArchiver 1.05
- PPMT 1.0
- HIP beta1
- LZ 1.0
- HuffComp 1.3
- Chile 0.5

- Some programs fail to correctly decompressing the archive created. Those programs are marked with a red penalty time of 99999 seconds. Do *not* use these programs to backup your data!.

- (De)compression time of ACB 2.00c is an approximation as ACB only runs under Win98 (which is installed on the 1800+ machine only). Measured time on the 1800+ is devided by the approximate ratio of compression speed on both machines.

- The command-line version of Squeez 5 seems to get different compression then the GUI version. The switch combination '-m5 -MD32768 -uxx9 -ME -MM -s' gets it down to 83.384.794 bytes...

- Stuffit 12.0 contains recompression techniques for several file types like JPG, GIF, BMP and PDF. For the MFC test I disabled PDF recompression as it appears to be "pixel perfect" rather then "bit-perfect" for most PDF files. This hurts compression a bit, but prevents the decompressed file to be slightly different than the original. This would be fine for normal users, but this is a lossless compression test. It would be unfair towards the lossless "bit perfect" compressors to include these result.

Conclusions and observations:
- Top performers (based on compression) in this test are PAQ8 and WinRK (PWCM). They are able to compress the 300+ Mb testset to under 62 Mb (80% reduction in size) but take a minimum of 8,5 hour to complete the test. The number one program (PAQ8P) takes almost 12 hours and number four (PAQAR) even 17 hours to complete the test. WinRK, the program with the 2nd best compression (79.7%) takes about 8,5 hours. Not surprisingly all mentioned programs make use of a PAQ(-like) engine for compression. If you have files with embedded images (e.g. Word DOC files) use PAQ8, it will recognize them and separately compress them, boosting compression significantly. All mentioned programs (except the current number 2, WinRK) are free of charge.

- WinRAR but especially NanoZip and FreeARC score very well on efficiency, they have good compression and are reasonably fast. FreeARC and NanoZIP are capable of compressing the testset down to 79 Mb in under 3 minutes. CCM takes just under 5 minutes. SBC compresses to about 85 MB but only needs 2 minutes for that. People looking for good (but not ultimate) and fast compression should have a look at those programs. Of the mentioned programs NanoZIP and CCM have the best compression, SBC and FreeARC are the fastest (FreeARC being both faster and the better compressor). Best 'super' compressor with a not to dramatic compression time is NanoZip, compressing then MFC testset to under 69 MB in 18 minutes using CM-mode.

- The speed-kings in this test are THOR, QuickLZ, SLUG and LZOP, the first two compress the total testset of 300+ MB in under 3.4 seconds (which generates a total data stream of 300 MB input + 150 MB output / 3.5 sec = 128 MB/s). At this speed IO/harddisk performance has a large impact on the compression speed, when compression from-to memory probably even higher compression speeds are possible. As a consequence of this speed compression ratio is not very high (barely 50%). Other fast compressors, with a bit better compression, are the oldies Pkzip, Arj and Gzip. If you are looking for a fast compressor with still good compression, consider UHARC 0.6b using LZP-mode (-mz) or FreeARC in m1 or m2 mode.

- Decompression speeds are usually a lot faster then compression speeds except for the compressors using a PPM or PAQ-engine. Decompression times of 5-7 seconds seem to be the systems (IO/hardisk) limit; compressing to ramdisk (or /dev/null) should probably be even faster...

- Normally I would expect 7-Zip to outperform WinRAR, but in this case I suspect WinRAR beats 7-Zip because there are (embedded) multimedia files (wav,bmp etc) which can be handled by WinRAR's multimedia filter. 7-Zip still lacks such a filter. I included multimedia files because many games are distributed in compressed form (games typically have lots of bmp and wav-like files).

- The higher the fraction of pre-compressed files the smaller the difference between the top and the other compressors. Because the testset contains files like chm,gif,jpeg the difference between the compressors looks rather small. I will probably make a 2nd testset with easy to compress non-multimedia data later on. Home

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