Lz4
lz4:最大超快壓縮級別是多少?
來自
man lz4
:--fast[=#] Switch to ultra-fast compression levels. The higher the value, the faster the compres‐ sion speed, at the cost of some compression ratio. If =# is not present, it defaults to 1. This setting overrides compression level if one was set previously. Similarly, if a compression level is set after --fast, it overrides it.
那麼最大超快壓縮級別是多少?它與壓縮級別相同(12)嗎?
目前是 65537,由常數
LZ4_ACCELERATION_MAX
確定。另請參閱有關“快速”壓縮的庫文件。
看命令行源碼,壓縮級別設置為負數
--fast=#
;這是這個數字的唯一用途。正如您所說,最大壓縮級別是 12,所以雖然我不能 100% 確定這裡存在對稱性,但最大有效快速數也可能是 12。