7-Zip Compression Methods
File used: Forum Log of October 2012 (Text files)
OS: Vista Ultimate 64-bit
CPU: Phenom II 940BE (3.0GHz K10.5)
Ram: DDR2-800 6GB
7-Zip: v9.20 64-bit
Common Parameters:
Archive format: zip
Compression level: Ultra
Dictionary size: 64MB
Number of CPU threads: 4
Uncompressed Size: 1,092,225,235 Byte
Compression methods:
LZMA* (Word size: 64): 115 sec / file size: 38,308,746
BZip2* (Dictionary size = 900KB): 435 sec / file size: 36,421,738
Deflate64 (Word size: 128): 360 sec / file size: 61,735,509
Deflate (Dictionary size: 32KB, Word size: 128): 363 sec / file size: 70,879,233
PPMd* (Dictionary size: 128MB, Word size: 12): 10 sec / file size: 24,651,072
LZMA with Normal Compression* (Dictionary size: 16MB, Word size: 32): 62 sec / file size: 41,953,860
* Cannot decompressed by Windows Vista Zip Utility
