Re: [請益] 7-zip的"字典大小"和"字組大小"的功用??

看板Trace (軟體操作討論)作者absszero (Abruti)時間17年前 (2008/05/25 08:53)推噓1(1推 0噓 0→)

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從 7-zip 隨軟體附上的說明檔擷取，希望有所幫助！ 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)》之銘言： : 7-zip在壓縮檔案時有"字典大小"和"字組大小"這二項可以選擇 : 我google一下只知道"字典"的功用是用來比對資料用的,字典大小 : 越大的話佔用的記憶體越多,但是找不到它到底有什麼功用? : 字典越大可以減少壓縮時間嗎?還是增加壓縮率?? : 而關於"字組"我就完全找不到資料了.. : 7-zip官網上也沒有相關資料 : 可以麻煩知道的人簡略的說一下這二項的功能嗎? 謝謝! ^^ -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 220.135.237.51