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Change the LZO testing option to be a bool on/off instead of taking a confusing parameter.

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Make the lzo testing message simpler and only appear when max verbose mode is enabled.
This commit is contained in:
Con Kolivas 2011-02-23 01:15:18 +11:00
parent fa34905d9d
commit 94673d3fe3
9 changed files with 37 additions and 75 deletions
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18
man/lrzip.1
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@ -57,7 +57,7 @@ Low level options:
\-L level set lzma/bzip2/gzip compression level (1\-9, default 7)
\-N value Set nice value to value (default 19)
\-p value Set processor count to override number of threads
\-T value Compression threshold with LZO test. (0 (nil) - 10 (high), default 1)
\-T Disable LZO compressibility testing
\-U Use unlimited window size beyond ramsize (potentially much slower)
\-w size maximum compression window in hundreds of MB
default chosen by heuristic dependent on ram and chosen compression
@ -110,13 +110,15 @@ progressively slower the larger the difference between ram and the file size,
so is best reserved for when the smallest possible size is desired on a very
large file, and the time taken is not important.
.IP
.IP "\fB-T 0\&.\&.10\fP"
Sets the LZO compression threshold when testing a data chunk when slower
compression is used. The threshold level can be from 0 to 10.
This option is used to speed up compression by avoiding doing the slow
compression pass. The reasoning is that if it is completely incompressible
by LZO then it will also be incompressible by them, thereby saving time.
The default is 1.
.IP "\fB-T\fP"
Disables the LZO compressibility threshold testing when a slower compression
back-end is used. LZO testing is normally performed for the slower back-end
compression of LZMA and ZPAQ. The reasoning is that if it is completely
incompressible by LZO then it will also be incompressible by them. Thus if a
block fails to be compressed by the very fast LZO, lrzip will not attempt to
compress that block with the slower compressor, thereby saving time. If this
option is enabled, it will bypass the LZO testing and attempt to compress each
block regardless.
.IP
.IP "\fB-d\fP"
Decompress. If this option is not used then lrzip looks at