从 7-zip 随软体附上的说明档撷取，希望有所帮助！ Dictionary size Specifies Dictionary size for compression method. Usually higher Dictionary size gives more compression ratio. But compressing can be slower and it can require more memory. Memory (RAM) usage for LZMA compressing is about 10 times more than dictionary size. Memory usage for LZMA decompressing is close to value of dictionary size. Memory usage for PPMd compressing and decompressing is almost equal to dictionary size. Word size Specifies the length of words, which will be used to find identical sequences of bytes for compression. Usually for LZMA and Deflate big Word size gives a little bit better compression ratio and slower compression process. Big Word size parameter can significantly increase compression ratio in case when files contain long identical sequences of bytes. For PPMd Word size has big meaning. It strongly affects both compression ratio and compression/decompression speed. ※ 引述《debeers (DeBeers)》之铭言： : 7-zip在压缩档案时有"字典大小"和"字组大小"这二项可以选择 : 我google一下只知道"字典"的功用是用来比对资料用的,字典大小 : 越大的话占用的记忆体越多,但是找不到它到底有什麽功用? : 字典越大可以减少压缩时间吗?还是增加压缩率?? : 而关於"字组"我就完全找不到资料了.. : 7-zip官网上也没有相关资料 : 可以麻烦知道的人简略的说一下这二项的功能吗? 谢谢! ^^ --

※ 发信站: 批踢踢实业坊(ptt.cc) ◆ From: 220.135.237.51