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updated documentation of targetLength

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Yann Collet
2018-03-12 11:35:01 -07:00
parent f24566b597
commit a57d43d4d4
3 changed files with 58 additions and 37 deletions
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programs/zstd.1.md
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@@ -347,14 +347,21 @@ The list of available _options_:
The minimum _slen_ is 3 and the maximum is 7.
- `targetLen`=_tlen_, `tlen`=_tlen_:
Specify the minimum match length that causes a match finder to stop
searching for better matches.
The impact of this field vary depending on selected strategy.
A larger minimum match length usually improves compression ratio but
decreases compression speed.
This option is only used with strategies ZSTD_btopt and ZSTD_btultra.
For ZSTD\_btopt and ZSTD\_btultra, it specifies the minimum match length
that causes match finder to stop searching for better matches.
A larger `targetLen` usually improves compression ratio
but decreases compression speed.
The minimum _tlen_ is 4 and the maximum is 999.
For ZSTD\_fast, it specifies
the amount of data skipped between match sampling.
Impact is reversed : a larger `targetLen` increases compression speed
but decreases compression ratio.
For all other strategies, this field has no impact.
The minimum _tlen_ is 1 and the maximum is 999.
- `overlapLog`=_ovlog_, `ovlog`=_ovlog_:
Determine `overlapSize`, amount of data reloaded from previous job.