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| author | Lasse Collin <lasse.collin@tukaani.org> | 2024-01-23 18:29:28 +0200 |
|---|---|---|
| committer | Lasse Collin <lasse.collin@tukaani.org> | 2024-01-23 18:29:28 +0200 |
| commit | 6daa4d0ea46a8441f21f609149f3633158bf4704 (patch) | |
| tree | f8a3fd6fdc49b7eba8c421e3c944a02f8baaaf9c /src/xz/xz.1 | |
| parent | CI: Use RISC-V filter when building with BCJ support. (diff) | |
| download | xz-6daa4d0ea46a8441f21f609149f3633158bf4704.tar.xz | |
xz: Use threaded mode by defaut (as if --threads=0 was used).
This hopefully does more good than bad:
+ It's faster by default.
+ Only the threaded compressor creates files that
can be decompressed in threaded mode.
- Compression ratio is worse, usually not too much though.
When it matters, -T1 must be used.
- Memory usage increases.
- Scripts that assume single-threaded mode but don't use -T1 will
possibly use too much resources, for example, if they run
multiple xz processes in parallel to compress multiple files.
- Output from single-threaded and multi-threaded compressors
differ but such changes could happen for other reasons too
(they just haven't happened since 5.0.0).
Diffstat (limited to 'src/xz/xz.1')
| -rw-r--r-- | src/xz/xz.1 | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/src/xz/xz.1 b/src/xz/xz.1 index 3c09309b..950585f8 100644 --- a/src/xz/xz.1 +++ b/src/xz/xz.1 @@ -1303,6 +1303,15 @@ meet this condition, but files compressed in single-threaded mode don't even if .BI \-\-block\-size= size has been used. +.IP "" +The default value for +.I threads +is +.BR 0 . +In +.B xz +5.4.x and older the default is +.BR 1 . . .SS "Custom compressor filter chains" A custom filter chain allows specifying |