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Diffstat (limited to 'doc/plzip.info')
| -rw-r--r-- | doc/plzip.info | 44 |
1 files changed, 25 insertions, 19 deletions
diff --git a/doc/plzip.info b/doc/plzip.info index 7e83ab0..e8bfe0d 100644 --- a/doc/plzip.info +++ b/doc/plzip.info @@ -11,7 +11,7 @@ File: plzip.info, Node: Top, Next: Introduction, Up: (dir) Plzip Manual ************ -This manual is for Plzip (version 1.3, 22 January 2015). +This manual is for Plzip (version 1.4-pre1, 25 February 2015). * Menu: @@ -116,7 +116,7 @@ compressed files is also supported. WARNING! Even if plzip is bug-free, other causes may result in a corrupt compressed file (bugs in the system libraries, memory errors, -etc). Therefore, if the data you are going to compress is important, +etc). Therefore, if the data you are going to compress are important, give the '--keep' option to plzip and do not remove the original file until you verify the compressed file with a command like 'plzip -cd file.lz | cmp file -'. @@ -180,8 +180,9 @@ The format for running plzip is: Set the size of the input data blocks, in bytes. The input file will be divided in chunks of this size before compression is performed. Valid values range from 8 KiB to 1 GiB. Default value - is two times the dictionary size. Plzip will reduce the dictionary - size if it is larger than the chosen data size. + is two times the dictionary size, except for option '-0' where it + defaults to 1 MiB. Plzip will reduce the dictionary size if it is + larger than the chosen data size. '-c' '--stdout' @@ -267,10 +268,10 @@ The format for running plzip is: verbosity level, showing status, compression ratio, dictionary size, decompressed size, and compressed size. -'-1 .. -9' +'-0 .. -9' Set the compression parameters (dictionary size and match length limit) as shown in the table below. Note that '-9' can be much - slower than '-1'. These options have no effect when decompressing. + slower than '-0'. These options have no effect when decompressing. The bidimensional parameter space of LZMA can't be mapped to a linear scale optimal for all files. If your files are large, very @@ -279,6 +280,7 @@ The format for running plzip is: performance. Level Dictionary size Match length limit + -0 64 KiB 16 bytes -1 1 MiB 5 bytes -2 1.5 MiB 6 bytes -3 2 MiB 8 bytes @@ -372,8 +374,8 @@ additional information before, between, or after them. 'Lzma stream' The lzma stream, finished by an end of stream marker. Uses default - values for encoder properties. See the lzip manual for a full - description. + values for encoder properties. *Note Stream format: (lzip)Stream + format, for a complete description. 'CRC32 (4 bytes)' CRC of the uncompressed original data. @@ -397,8 +399,11 @@ File: plzip.info, Node: Memory requirements, Next: Minimum file sizes, Prev: The amount of memory required *per thread* is approximately the following: - * For compression; 11 times the dictionary size plus 3 times the - data size (*note --data-size::). + * For compression at level -0; 1.5 MiB plus 3 times the data size + (*note --data-size::). + + * For compression at other levels; 11 times the dictionary size plus + 3 times the data size. * For decompression of a regular (seekable) file to another regular file, or for testing of a regular file; the dictionary size. Note @@ -439,6 +444,7 @@ default data size for each level: Processors 2 4 8 16 64 256 ------------------------------------------------------------------------- Level +-0 2 MiB 4 MiB 8 MiB 16 MiB 64 MiB 256 MiB -1 4 MiB 8 MiB 16 MiB 32 MiB 128 MiB 512 MiB -2 6 MiB 12 MiB 24 MiB 48 MiB 192 MiB 768 MiB -3 8 MiB 16 MiB 32 MiB 64 MiB 256 MiB 1 GiB @@ -489,15 +495,15 @@ Concept index Tag Table: Node: Top221 -Node: Introduction988 -Node: Program design5284 -Node: Invoking plzip6873 -Ref: --data-size7287 -Node: File format12414 -Node: Memory requirements14930 -Node: Minimum file sizes15907 -Node: Problems17758 -Node: Concept index18294 +Node: Introduction994 +Node: Program design5291 +Node: Invoking plzip6880 +Ref: --data-size7294 +Node: File format12518 +Node: Memory requirements15061 +Node: Minimum file sizes16130 +Node: Problems18052 +Node: Concept index18588 End Tag Table |