Sometimes it can increase speed even on single-core CPU. Specifies the number of threads for compressing.Ī big number of threads can speed up compression speed on Multi-Processor systems. Solid mode is switched off and the existing archive is non-solid. You can use this option only for 7z archives. Usually compressing to a solid archive improves the compression ratio. In solid mode all files will be compressed as continuous data blocks. The Word size strongly affects both compression ratio andĬompression/decompression speed. Usually for LZMA and Deflate, big Word size gives a little bit betterĬompression ratio and slower compression process.Ī big Word size parameter can significantly increase compression ratioįor files which contain long identical sequences of bytes. Specifies the length of words, which will be used to find identical
Memory usage for PPMd compressing and decompressing is almost equal Memory usage for LZMA decompressing is close to value of dictionary size. Memory (RAM) usage for LZMA compressing is about 11 times more than dictionary size. Usually, a higher Dictionary size gives a higher compression ratio.īut compressing can be slower and it can require more memory. Specifies Dictionary size for compression method. Modified version of Deflate algorithm withĮstimated 7-Zip performance and memory requirements for AMD Athlon 64 X2 3800+: Method But it provides pretty fastĬompressing and decompressing. Standard compression method of ZIP and GZip formats.Ĭompression ratio is not too high. Usually it provides high speed and pretty good Standard compression method based on BWT algorithm. Usually it provides high compression ratio and high speed It provides highĬompression ratio and very fast decompression.ĭmitry Shkarin's PPMdH algorithm with small changes. Each archive format can have its own compression methods: Methodĭefault compression method of 7z format.
There are 6 levels of compression: Valueįiles will be copied to archive without compression.Ĭan give a higher compression ratio than Normal level.īut it can be slower, and it can require more memory.Ĭan give a higher compression ratio than Maximum level. Some formats (gzip and bzip2)ĭo not support compressing more the one file per archive.
Archive format Specifies a format of created archive. Parameters Archive Provides a space for you to specify a destination archive name. Point to 7-Zip, and then click the Add to archive.In Windows Explorer or in 7-Zip, right-click the file(s) or folder(s) you want to compress.Previous page next page Add to Archive Dialog BoxĪllows you to specify options for creating or updating an archive.
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