Lines Matching +full:fast +full:- +full:speed
3 bzip2, bunzip2 \- a block-sorting file compressor, v1.0.8
5 bzcat \- decompresses files to stdout
7 bzip2recover \- recovers data from damaged bzip2 files
12 .RB [ " \-cdfkqstvzVL123456789 " ]
19 .RB [ " \-fkvsVL " ]
25 .RB [ " \-s " ]
35 compresses files using the Burrows-Wheeler block sorting
38 LZ77/LZ78-based compressors, and approaches the performance of the PPM
41 The command-line options are deliberately very similar to
48 command-line flags. Each file is replaced by a compressed version of
57 MS-DOS.
63 files. If you want this to happen, specify the \-f flag.
76 .I bzip2 \-d)
112 testing (\-t)
117 giving the \-c flag. Multiple files may be compressed and
132 .I bzip2 -dc)
153 As a self-check for your protection,
156 uses 32-bit CRCs to
181 .B \-c --stdout
184 .B \-d --decompress
197 .B \-z --compress
198 The complement to \-d: forces compression, regardless of the
201 .B \-t --test
205 .B \-f --force
215 correct magic header bytes. If forced (-f), however, it will pass
218 .B \-k --keep
222 .B \-s --small
226 decompressed in 2300k of memory, albeit at about half the normal speed.
228 During compression, \-s selects a block size of 200k, which limits
231 less), use \-s for everything. See MEMORY MANAGEMENT below.
233 .B \-q --quiet
234 Suppress non-essential warning messages. Messages pertaining to
237 .B \-v --verbose
238 Verbose mode -- show the compression ratio for each file processed.
239 Further \-v's increase the verbosity level, spewing out lots of
242 .B \-L --license -V --version
245 .B \-1 (or \-\-fast) to \-9 (or \-\-best)
248 The \-\-fast and \-\-best aliases are primarily for GNU gzip
249 compatibility. In particular, \-\-fast doesn't make things
251 And \-\-best merely selects the default behaviour.
253 .B \--
256 with a dash, for example: bzip2 \-- \-myfilename.
258 .B \--repetitive-fast --repetitive-best
268 compression and decompression. The flags \-1 through \-9
275 that the flags \-1 to \-9 are irrelevant to and so ignored
301 kbytes. Decompression speed is also halved, so you should use this
302 option only where necessary. The relevant flag is -s.
306 decompression speed are virtually unaffected by block size.
309 -- that means most files you'd encounter using a large block size. The
312 20,000 bytes long with the flag -9 will cause the compressor to
325 Flag usage usage -s usage Size
327 -1 1200k 500k 350k 914704
328 -2 2000k 900k 600k 877703
329 -3 2800k 1300k 850k 860338
330 -4 3600k 1700k 1100k 846899
331 -5 4400k 2100k 1350k 845160
332 -6 5200k 2500k 1600k 838626
333 -7 6100k 2900k 1850k 834096
334 -8 6800k 3300k 2100k 828642
335 -9 7600k 3700k 2350k 828642
341 a multi-block .bz2
345 The compressed representation of each block is delimited by a 48-bit
347 reasonable certainty. Each block also carries its own 32-bit CRC, so
355 \-t
365 wildcards in subsequent processing -- for example,
366 "bzip2 -dc rec*file.bz2 > recovered_data" -- processes the files in
372 futile to use it on damaged single-block files, since a
384 worst-case and average-case compression time is in the region of 10:1.
386 \-vvvv option to monitor progress in great detail, if you want.
388 Decompression speed is unaffected by these phenomena.
394 determined by the speed at which your machine can service cache misses.
417 versions prior to 1.0.2 used 32-bit integers to represent
420 64-bit ints on some platforms which support them (GNU supported
424 with MaybeUInt64 set to be an unsigned 64-bit integer.
447 speed up compression. Bela Lubkin encouraged me to improve the
448 worst-case compression performance.