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Deprecate the -M option as it is no longer of any significant utility compared to the -U option.

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Con Kolivas 2011-02-22 20:38:39 +11:00
parent 0f1d447541
commit 9c8b1ee795
7 changed files with 16 additions and 50 deletions
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15
man/lrzip.1
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@ -55,7 +55,6 @@ Options affecting compression:
\-z zpaq compression (best, extreme compression, extremely slow)
Low level options:
\-L level set lzma/bzip2/gzip compression level (1\-9, default 7)
\-M Maximum window (all available ram)
\-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)
@ -101,23 +100,15 @@ Set the compression level from 1 to 9. The default is to use level 7, which
gives good all round compression. The compression level is also strongly related
to how much memory lrzip uses. See the \-w option for details.
.IP
.IP "\fB-M \fP"
Maximum window size\&. If this option is set, then lrzip tries to load the
entire file into ram as one big compression window, and will reduce the size of
the window until it does fit. This may induce a hefty swap load on your machine
but can also give dramatic size advantages when your file is the size of your
ram or larger.
.IP
.IP "\fB-U \fP"
Unlimited window size\&. If this option is set, and the file being compressed
does not fit into the available ram, lrzip will use a moving second buffer as a
"sliding mmap" which emulates having infinite ram. This will provide the most
possible compression in the first rzip stage which can improve the compression
of ultra large files when they're bigger than the available ram. However it runs
progressively slower the larger the difference between ram and the file size so
it is worth trying the \-M option first to see if the whole file can be accessed
in one pass, and then if not, it should be used together with the \-M option (if
at all).
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