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 compressor efficiency

Pos Program Switches used TAR Q6600 Compressed Compression Comp time Decomp time Efficiency
  Size (bytes) Ratio (%) (sec) (sec) lower is better
000TESTSETNY3163557570.00
0
00
001FreeARC 0.666(none)NY8123495174.32
24.1
11.8289
002FreeARC 0.666-m3NY8590588272.85
13.6
10.5326
003FreeARC 0.666-m2NY9165002871.03
6.9
7.8376
004NanoZip 0.09a(none)NY7990552574.74
58.4
14.1504
005NanoZip 0.09a-cDpNY9063834871.35
20.7
9.1681
006FreeARC 0.666-mxNY7840622075.22
83.9
33.5691
007WinRAR 4.1b3Normal solidNY9036186671.44
36.2
4.7907
008WinRAR 4.1b3NormalNY9199523170.92
29.7
4.6912
0097-Zip 9.25aNorm LZMA2 16Mb ws=32 4thrNY8858041672.00
49.2
7.11024
010WinRAR 4.1b3Best solidNY8665821072.61
48.7
22.51047
011NanoZip 0.09a-cONY7572069676.06
208
45.31106
012CCM 1.30c6YY7792692275.37
107
1031171
013WinRK 3.1.2NormalNY7888289075.07
157
33.51181
014FlashZIP 0.99b8-m1NY9469008070.07
20.2
12.91187
015CCM 1.30c(none)YY7859898075.15
102
981202
016SBC 0.970 rev3-b9NY8574026572.90
60
331235
017SBC 0.970 rev3(none)NY8624528872.74
57
331264
018WinRK 3.1.2FastestNY9082141171.29
30.9
23.71274
019CCMx 1.30c6YY7707994975.64
130
1261300
020CSC 3.2a6-m3YY9329546870.51
35.8
9.21382
0217-Zip 9.25aUltra LZMA2 64Mb 3thrNY8719804672.44
91.1
7.81544
022SBC 0.970 rev3-m3 -b62NY8473617673.21
102
401686
023WINZIP 14Zipx Best MethodNY8627646272.73
95
27.51726
024WinACE 2.69Norm solid ace20NY8974271571.63
74
12.31787
025DURILCA light 0.5-m800 -t1NY8166647474.19
155
761951
026NanoZip 0.09a-cc -m800mNY6985780377.92
464
4382054
027StuffIt 14.0Auto filetype L16 M30 BP ENY9012551571.51
30.1
672098
028WinACE 2.69Max 4096Kb solid ace20NY8848521572.03
108
12.32166
029ACE 2.6-m5 -d4096NY8848603172.03
109
12.92195
030SQUEEZ 5.63Ultra 32Mb M E SolidNY8356505873.59
181
29.62196
031StuffIt 14.0BWT L3 M23 BPNY8968339171.65
32.3
78.22273
032FlashZIP 0.99b8-m2 -c7NY9263546970.72
65.3
16.72340
033SLUG X(none)YY11228638364.51
4.4
5.22427
034DGCA 1.10(none)NN8983430471.60
83
342447
035SQUEEZ 5.63Norm 4Mb M E SolidNY9408262270.26
54.3
19.22463
036StuffIt 14.0Auto Inline L9 M30 BP ENY8931014271.77
35.4
89.82471
037COMPRESSIA 1.0bsol dict 15 MbNN8815278472.13
86
622568
038Tornado 0.4a(none)YY10574292266.57
13.9
8.12690
039CTXf 0.75(none)NY9003888471.54
74.7
51.72704
040SQUEEZ 5.63Max 8Mb M E SolidNY8769535872.28
155.7
19.22885
041RZM 0.07h(none)YY8403037473.44
244
19.92898
042UHARC 0.6b(none)NY8495450673.15
209
332945
043UHARC 0.6b-mx -md32768 -mm+NY7834487675.24
278
2342991
044WINIMP 1.211 Normal MM 4Mb B=600KbNY9963886268.50
34.2
14.13000
045BSC 3.0.0(none)YY10259824967.57
19.6
15.33010
046CTXf 0.75-meNY8835799272.07
98.3
75.43084
047BSSC 0.95a(none)YY9581121869.71
53.9
25.33216
048JAR 1.02(none)NN10116907168.02
37
93386
049UHARC 0.6b-mz -md32768 -mm+NY9925115768.63
28.6
363843
050LZTurbo 0.95-43YY11389820364.00
6.7
6.53991
051DURILCA 0.5-m800 -t1NY7217557877.19
738
6574109
052WINIMP 1.211 BEST MM 16Mb B=1020KbNY9723772769.26
72.3
14.14110
053THOR 0.96e5YY11227511264.51
12.6
3.84141
054LZTurbo 0.95-59NY9364678470.40
126
7.24254
055GRZipII 0.2.4-b8m -aYN9748413669.19
48
434449
056WinRK 3.1.2HighNY6900345878.19
1311
9804745
057BMA 1.35b(none)NN9872890068.79
54
405277
058Ultra7z Opt 0.05(none)NY8493233573.15
406
40.25416
059Etincelle RC2(none)YY12177806661.51
3.9
3.65438
060WinTurtle 1.60(none)NN10356765867.26
28
305571
061CMM4 0.2b26YY8243545873.94
302
3075603
062WinTurtle 1.60SolidNN10312967267.40
31
335856
063LZPX(J) 1.2h(none)YY9207518370.90
110
1115927
064LZPX(J) 1.2h-8YY9145135971.09
119
1185931
065Blizzard 0.24b(none)YN9829628268.93
60
525992
066Tornado 0.4a-11YY9995983868.40
87
8.16120
067BIT 0.7(none)YY8332188873.66
305
2986121
068LPAQ88YY7870418675.12
504
5076147
069BMA 1.35b-m16m -ax -mxNN9528441869.88
101
616204
070BA 1.01(none)YY9987309868.43
58.5
406278
071PPMonstr J-m800 -o32NY7769968675.44
587
5936417
072PPMonstr J(none)NY7844386275.20
568
5736739
073DURILCA light 0.5(none)NY9682356569.39
71
806861
074PPMd var J rev.1-m256 -o16NY9673751569.42
73
806885
075DARK 0.51(none)NN10087706268.11
60
386983
076RINGS 1.65YY10579651466.56
28.8
28.47036
077BIX 1.00 b7(none)NY9969443268.49
101
11.77042
078DARK 0.51-b128mNN10078545068.14
61
397053
079GRZipII 0.2.4(none)YN10168637067.86
48
457249
080BALZ 1.15exYY9912375368.67
108
21.37584
081MNZIP(none)YN9848804568.87
111
287597
082THOR 0.96e3YY12458865660.62
3.8
3.97628
083BZP 0.3(none)NN11148580264.76
16
177634
084BIX 1.00 b7-mdG -sNY9707914169.31
152
11.57642
0857-Zip 9.25aMax PPMD 64Mb ws=16NY9757374469.16
75.9
80.37713
086PIM 2.90Best + filtersNY8963993971.66
299
907962
087PPMVC 1.2(none)NN9715252069.29
82
1018624
088Quark 0.95r(none)YN8474131473.21
702
378782
089BioArc 1.9UltraNN9969905868.49
66
768878
090BioArc 1.9NormalNN10001277768.39
64
748933
091PKZIP 2.50(none)NY11450126363.81
16
11.78955
092VuZip 1.8DefaultNN11526112963.57
19
79145
093PPMd var J rev.1(none)NY10274352567.52
49
569204
094GZIP 1.2.4(none)YY11544296463.51
15.5
10.29224
095File2Pack 2.0(none)NY11530590163.55
16.3
10.29368
096CABARC 1.00.0106-m LZX:17NY10314825667.39
89
13.29370
097EAZEL 1.0(normal)NN11530976263.55
20
79549
098RZIP 2.1(none)YN10541772366.68
56
259554
099BZIP2 1.0.5(none)YY10772092365.95
48.7
14.19565
100YBS 0.03f(none)YY10507408366.79
51
34.99753
101PKZIP 2.50-exxNY11402234763.96
19.8
12.49871
102CABARC 1.00.0106-m LZX:21NY9769144469.12
187
13.410026
103DZip 2.90(none)NY11526988263.56
18.4
10.610211
104DURILCA 0.5(none)NY7760445375.47
947
95110213
105AIN 2.32(none)NY11558711563.46
17.7
10.510285
106ZPAQ 2.05max.cfgNY7632855975.87
1107
111110359
107BCM 0.12-b16YY10245033867.62
69.5
52.710369
108LHARK 0.4d(none)NY11343906364.14
26.5
10.110517
109RZIP 2.1-9YN10530541866.71
65
2610600
110Slim 0.23d(none)NY7378197276.68
1555
148610706
111WinHKI 1.74HKI1 maxNN10639121866.37
64
1810776
112Slim 0.23d-m800 -o64NY7366468376.71
1574
152910783
113QUAD 1.12(none)YN10821543465.79
44
2410942
114UC II 3.05-TTNY10637088066.38
73
11.111027
115SZIP 1.12(none)YN10656717966.31
55
3011390
116ESP 1.92(none)NY11516457763.60
22.3
11.111623
117PPMVC 1.2-o16 -m256NN9652507169.49
128
14712087
118WinHKI 1.74HKI2 normNN10020800668.32
91
9412238
119 BCArchive 1.08.7(none)NN11582112463.39
19
1412352
120AIN 2.32-m1NY11517808263.59
22.6
13.212477
121ALZip 7.0b1(normal)NN11849287762.54
17
812588
122WINZIP 14Enhanced DeflateNY11150329064.75
47.9
6.512609
123M99 2.2.1-m 512mYN10174666267.84
86
7912948
124DST 0.91b(none)YY10338637467.32
104
3713274
125UFA 0.04b1(none)NN9417563870.23
350
4213275
126QUAD 1.12xYN10696829166.19
71
2413310
127WinXP (Built-in Zip)(none)NY11632401163.23
15.1
18.613338
128M99 2.2.1(none)YN10829487665.77
53
3113636
129WinHKI 1.74HKI2 maxNN9877107568.78
123
12614043
130ARJ32 3.15(none)NY11610726563.30
25.8
10.614064
131EPC 1.0(none)YY10125867067.99
92.6
100.314339
132VuZip 1.8MaxNN11467960863.75
37
714509
133DST 0.91b-meYY9356834770.42
275
18514562
134Crush 0.01cfYY12309034761.09
13.9
3.814847
135GZIP 1.2.4-9YY11485797763.69
35.1
9.915136
136CODEC 3.21(none)NN11476727563.72
27
2015650
137WinUDA 0.291mode-0NY7971066974.80
1178
118016031
138M1 0.3b-1text2.txtYY10437767667.01
75
7916184
139EAZEL 1.0(best)NN11472837063.73
41
816246
140WINZIP 14SuperFastNY12527905760.40
9
6.416470
141LHARK 0.4d-tobNY11187091564.64
59
11.116924
142YBS 0.03f-m16mYY10746234666.03
73.8
41.317035
143EPM r9-m800YY8193490974.10
980
98817126
144EPM r9(none)YY8272785273.85
903
90417172
145PACKET 0.91a-m6 -s9YY10454589166.95
153
7.617195
146ARJ 2.85(none)NY11610961263.30
35
10.217469
147QazaR 0.0 pre5(none)YY10816597965.81
66.6
4417699
148TC 5.2 dev2(none)YY8946477871.72
458
46018428
149LZPM 0.16(none)YY9552505169.80
448
20.818441
150UDA 0.301(none)YY7147876777.41
3369
341218487
151DZip 2.90-9NY11468849063.75
44.5
11.718551
152TarsaLZP 21Aug2007(none)YN11099461464.91
39
4718839
153LZTurbo 0.95-22YY13277381858.03
2.7
518922
154TURTLE 0.07(none)YN11264674964.39
37
3518947
155BruteCM 0.1d(none)YN10090260068.10
107
16019078
156UHBC 1.0(none)YY10099006268.08
148
11819192
157UC II 3.05(max compress)NY10562549666.61
157
10.520218
158UFA 0.04b1-mg -mx -mu32NN9342829270.47
521
13820540
159SEMONE 0.6 b2(none)YN11144268664.77
81
1421871
160Bee 0.7.9 bld 0316-m2 -d8NN9310349170.57
362
36821947
161Comprox 0.3.0e20YY11139190464.79
63
34.222252
162Quark 0.95r-l7 -d25YN8367356773.55
2095
3822513
163Zhuff 0.2(none)YY13243059058.14
3.2
6.623183
164SR3a(none)YN11818319962.64
23
2623839
165UHBC 1.0-b4m -m3YY10062322068.19
190
16024246
166QC 0.050(none)YY9905504468.69
308
12124970
167DeepFreezer 1.06(none)NN12335035161.01
20
925038
168WinUDA 0.291mode-3NY7373557476.69
3663
369125756
169PPMN 1.00b1 km-O9 -M:50 -DAYY9551381769.81
365
36528680
170PIMPLE2(none)YN7962815774.83
2195
220729654
171MAR-gNY11255478664.42
112
6.530866
172PPMX 0.07(none)YY10757558266.00
106
11132523
173DACT 0.8.42(none)YY10337871867.32
333
19.433146
174QLFC 6.6w(none)NN10293827667.46
343
3033410
175PPMN 1.00b1 km(none)YY10118137068.02
232
23434345
176KGB 1.1 (PAQ6)(normal)NY8687845872.54
1133
115734498
177WinRK 3.1.2MaximumNY6429424379.68
14265
1398534692
178Bee 0.7.9 bld 0316-m3 -d8 -sNN9200398070.92
654
65834912
179Chaos Comp 3.0(none)NN12368156060.90
31
834932
180PAQ8P-7NY6268317280.19
17976
1665335562
181777 0.04b1-mg -mu32NN9022947771.48
1067
59136231
182ASD 0.2.0(none)NN10910136065.51
158
5637992
183HOOK 1.4800YY10778894265.93
128
12438673
184QuickLZ 1.40b9mode3NY13397390957.65
10.1
4.741553
185777 0.04b1(none)NN9054438271.38
1215
63341820
186PAQ8px-7NY6244373880.26
23427
2201945446
187LZ2A-Cb12 -Szd26YN11358889764.09
138
1945869
188YZX 0.04-sNY12368870160.90
30.7
23.248317
189QPress 0.38b-L3YY14119460755.37
4.3
3.649438
190LZ2A(none)YN11529898363.55
120
2049452
191ULZ 0.02c6YY12795118159.55
30.8
3.749638
192ABC 2.4(none)YY10366974467.23
424
9350225
193QazaR 0.0 pre5-d9 -l7YY10486710566.85
362
9951151
194CHILE 0.3d(none)YN10607254266.47
345
6351752
195PAQ8JC-6 (dir /oen)NN6619113979.08
18908
1621253237
196QLFC 6.6wBS=8388608NN10121754468.01
693
3353722
197SZIP 1.12-b41 -o40YN10579318366.56
373
7755336
198BOA 0.58b(none)NN9685751569.38
596
62055457
199LZXQ 0.4normalYN11449298763.81
71
10857817
200BOA 0.58b-m15 -sNN9508046869.95
773
78658372
201HYPER 2.5(none)NN12843987059.40
24
1559241
202KGB 1.1 (PAQ6)(very good)NY7534137576.18
7830
788965796
203QPress 0.38b-L2YY14807067253.19
1.8
3.672496
204ZZIP 0.36c(none)NN10384540467.17
706
4173998
205HA 0.999ba21NN10763741465.98
373
14177566
206SAR 1.0(none)NN12206742361.41
94
1178621
207ACB 2.00cuNN9505528969.95
1056
110780761
208PAQAR 4.5-7e (dir /oen/b)NN6843571578.37
21322
2141083103
209PAsQDa 4.4-7eNN6910918778.15
21101
2117388594
210Ocamyd 1.66 test1-m8 -s0YN8288038573.80
4666
466490177
211M03(none)YN9993465168.41
1356
221101205
212ASH 07-m800 -o60YY8622563272.74
3641
3639102003
213Ocamyd 1.66 test1-m8 -s2YY10920010565.48
286
288103027
214AR 1.0(none)YY12214734261.39
128.4
10.5104931
215THOR 0.96e1YY15193695451.97
1.9
3.6113415
216aPLib 0.43(none)NN11759676262.83
253
7118523
217LZOP 1.02rc1-9YY12960173359.03
64
4.7118720
218ARX 1.0(none)NN13346419957.81
35
11122047
219ZZIP 0.36c-mx -a -6mNN10239264367.63
1598
41138179
220ShipInBottle 1.0 b17alg:lzNN11405109163.95
481
22154691
221Bicom 1.01(none)YN10394051367.14
826
838166586
222XPv5c2YY11355439864.11
564
114.5197471
223LZOP 1.02rc1-1YY15499381451.01
3.7
3.4205556
224LZOP 1.02rc1(none)YY15538908950.88
3.7
3.5217801
225CA-ZIP 3.4(none)YY14024776255.67
32.4
7.5224784
226BriefLZ 1.04(none)NY15161187652.08
5.2
7.9260559
227HPACK 0.79a(none)NN12070201461.85
377
31262535
228QuickLZ 1.40b9mode1NY15684000650.42
2.1
5.6273631
229ASD 0.2.0-m5 -mdgNN10510974066.77
2425
163294995
230LZC 0.082YY14965190952.70
13.9
5.7313621
231KZIP 14-APR-2007(none)NY11069493265.01
1778
11.3379128
232Ocamyd 1.66 test1(none)YY12426269060.72
226
229434702
233ShipInBottle 1.0 b17alg:ppm :mem:128NN10674242266.26
1620
1635444745
234SCM 0.01b(none)YY9737395869.22
4615
4645447233
235Secura Archiver 1.7(none)NN13987634855.79
131
6740640
236COMPRESSIA 1.0bmax sol dict 15 MbNN8069834074.49
803
99999764699
237BWMonstr 0.01(none)YY10307340767.42
6010
3372853058
238SRANK 1.0(none)YY16411092948.12
7.3
7.81202732
239SYMBRA 0.2-m5YN12212055861.40
1110
6701340701
240BBB ver1m512YN10636476166.38
12294
5111677772
241ENC 0.15abies -d256NN8795559072.20
3498
999991757147
242ENC 0.15-d256NN8975052871.63
1440
999992101919
243LZW 0.2(none)YY15328952051.55
154
5.73826627
244EPC 1.0-m256 -o18YY9879716468.77
156
999995665076
245DC 0.99.307b-b4096NY9954659068.53
107
999996153492
246LCSSR 0.2-l9 -b6YN12637878760.05
2918
27856891230
247DC 0.99.307b(none)NY10131422467.97
101
999997487039
248AI 1.1-mtNN10736515166.06
27097
377369492408
249CTW 0.1(none)YN13468738057.43
2661
285116751159
250CODER 1.1-ew 4194304NN15878862149.81
330
10819323559
251WinXP (NTFS)(none)NY19082252939.68
5.4
7.419775154
252AMG 2.2(Max Compression)NN11466275863.76
97
9999932945907
253AI 1.1(none)NN14025973555.66
3523
584652852078
254BigCrunch 0.4a1(none)NN15750260050.21
546
147677338794


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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