IPC test set

[FatBit]

Dear forum members,

I made some comparison of various programs and data set called IPC. Complex = files in directory structure, flat = same files in one directory.

Zip = native Win 6.1 zip, zpaq # = zpaq method #, usually last version programs, default setting + compression level = maximum. Results enclosed in spreadsheet file.

Best regards,

FatBit

[Matt Mahoney]

	Complex	        Flat	        D
7z	3,730,845	3,727,509	3,336
arc	2,583,632	2,577,852	5,780
nz	7,258,446	6,607,199	651,247
pea	70,793,925	70,102,257	691,668
rar	70,242,390	69,548,373	694,017
rar5	70,344,970	69,655,627	689,343
zip	74,392,573	73,001,337	1,391,236
zpaq 1	7,167,146	7,125,894	41,252
zpaq 2	6,979,560	6,935,605	43,955
zpaq 3	7,743,650	7,718,897	24,753
zpaq 4	5,045,997	5,002,302	43,695

I guess the reason for the large size of peazip, zip, rar, rar5 is due to compressing each file separately?

[FatBit]

Complex Flat Difference
7z 03 730 845|03 727 509|0 003 336
arc 02 583 632|02 577 852|0 005 780
nz 07 258 446|06 607 199|0 651 247
pea 70 793 925|70 102 257|0 691 668
rar 70 242 390|69 548 373|0 694 017
rar solid 08 465 857|07 771 840|0 694 017
rar5 70 344 970|69 655 627|0 689 343
rar5 solid 08 286 303|07 596 952|0 689 351
zip 74 392 573|73 001 337|1 391 236
zpaq 1 07 167 146|07 125 894|0 041 252
zpaq 2 06 979 560|06 935 605|0 043 955
zpaq 3 07 743 650|07 718 897|0 024 753
zpaq 4 05 045 997|05 002 302|0 043 695

I added rar with solid=on -> situation is much better, native zip from Win 7 does not have options, I did not find option solid=on in the case of peazip.

Best regards,

FatBit

[Matt Mahoney]

Lots of common data, I guess. It would be interesting to test a tar file, or compress with zip -0 (store only) followed by zip -9.

[FatBit]

I added requested items: source size, tar (as one directory) size, 5 times zip compression step sizes, all from Peazip 5.2.0.

Best regards,

FatBit