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updated documentation

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introducing ZSTD_btultra2
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Yann Collet
2018-12-06 17:22:19 -08:00
parent ae370b0e12
commit 34aa401afd
5 changed files with 12 additions and 11 deletions
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programs/zstd.1.md
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@@ -339,9 +339,10 @@ The list of available _options_:
- `strategy`=_strat_, `strat`=_strat_:
Specify a strategy used by a match finder.
There are 8 strategies numbered from 1 to 8, from faster to stronger:
1=ZSTD\_fast, 2=ZSTD\_dfast, 3=ZSTD\_greedy, 4=ZSTD\_lazy,
5=ZSTD\_lazy2, 6=ZSTD\_btlazy2, 7=ZSTD\_btopt, 8=ZSTD\_btultra.
There are 9 strategies numbered from 1 to 9, from faster to stronger:
1=ZSTD\_fast, 2=ZSTD\_dfast, 3=ZSTD\_greedy,
4=ZSTD\_lazy, 5=ZSTD\_lazy2, 6=ZSTD\_btlazy2,
7=ZSTD\_btopt, 8=ZSTD\_btultra, 9=ZSTD\_btultra2.
- `windowLog`=_wlog_, `wlog`=_wlog_:
Specify the maximum number of bits for a match distance.
@@ -394,8 +395,8 @@ The list of available _options_:
- `targetLen`=_tlen_, `tlen`=_tlen_:
The impact of this field vary depending on selected strategy.
For ZSTD\_btopt and ZSTD\_btultra, it specifies the minimum match length
that causes match finder to stop searching for better matches.
For ZSTD\_btopt, ZSTD\_btultra and ZSTD\_btultra2, it specifies
the minimum match length that causes match finder to stop searching.
A larger `targetLen` usually improves compression ratio
but decreases compression speed.