Lines Matching full:compression
72 - __ZSTD_NOCOMPRESS__ : `zstd` cli will be compiled without support for compression.
111 which can be loaded before compression and decompression.
113 Using a dictionary, the compression ratio achievable on small data improves dramatically.
114 These compression gains are achieved while simultaneously providing faster compression and decompre…
117 Dictionary gains are mostly effective in the first few KB. Then, the compression algorithm
128 CLI includes in-memory compression benchmark module for zstd.
134 The benchmark measures ratio, compressed size, compression and decompression speed.
135 One can select compression levels starting from `-b` and ending with `-e`.
148 -# : # compression level (1-19, default: 3)
150 -D DICT: use DICT as Dictionary for compression or decompression
153 --rm : remove source file(s) after successful de/compression
167 --[no-]check : during compression, add XXH64 integrity checksum to frame (default: enabled). If spe…
170 Advanced compression arguments :
173 --fast[=#]: switch to very fast compression levels (default: 1)
174 --adapt : dynamically adapt compression level to I/O conditions
176 -T# : spawns # compression threads (default: 1, 0==# cores)
178 --single-thread : use a single thread for both I/O and compression (result slightly different than …
182 --size-hint=# optimize compression parameters for streaming input of approximately this size
184 --no-dictID : don't write dictID into header (dictionary compression only)
208 -b# : benchmark file(s), using # compression level (default: 3)
209 -e# : test all compression levels successively from -b# to -e# (default: 1)
221 `ZSTD_CLEVEL` can be used to modify the default compression level of `zstd`
225 that `zstd` will use for compression, which by default is `1`.
233 As `ZSTD_CLEVEL` and `ZSTD_NBTHREADS` only replace the default compression level
235 `-#` for compression level and `-T#` for number of threads.
240 the compression ratio for files with long matches at a large distance (up to the
241 maximum window size, `128 MiB`) while still maintaining compression speed.
245 dependent on long matches being found. Compression speed may degrade if few long
249 Below are graphs comparing the compression speed, compression ratio, and
256 Compression Speed vs Ratio | Decompression Speed
258  will likely lead to a deterioration in
274 compression speed (for lower levels) with minimal change in compression ratio.
276 The below table illustrates this on the [Silesia compression corpus].
278 [Silesia compression corpus]: http://sun.aei.polsl.pl/~sdeor/index.php?page=silesia
280 | Method | Compression ratio | Compression speed | Decompression speed |
296 `zstdgrep` is _not_ compatible with dictionary compression.