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updated documentation

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introducing ZSTD_btultra2
This commit is contained in:
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
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@@ -1,5 +1,5 @@
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.TH "ZSTD" "1" "November 2018" "zstd 1.3.8" "User Commands"
.TH "ZSTD" "1" "December 2018" "zstd 1.3.8" "User Commands"
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.SH "NAME"
\fBzstd\fR \- zstd, zstdmt, unzstd, zstdcat \- Compress or decompress \.zst files
@@ -316,7 +316,7 @@ set process priority to real\-time
Specify a strategy used by a match finder\.
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.IP
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\.
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.TP
\fBwindowLog\fR=\fIwlog\fR, \fBwlog\fR=\fIwlog\fR
@@ -373,7 +373,7 @@ The minimum \fImml\fR is 3 and the maximum is 7\.
The impact of this field vary depending on selected strategy\.
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.IP
For ZSTD_btopt and ZSTD_btultra, it specifies the minimum match length that causes match finder to stop searching for better matches\. A larger \fBtargetLen\fR usually improves compression ratio but decreases compression speed\.
For ZSTD_btopt, ZSTD_btultra and ZSTD_btultra2, it specifies the minimum match length that causes match finder to stop searching\. A larger \fBtargetLen\fR usually improves compression ratio but decreases compression speed\.
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.IP
For ZSTD_fast, it triggers ultra\-fast mode when > 0\. The value represents the amount of data skipped between match sampling\. Impact is reversed : a larger \fBtargetLen\fR increases compression speed but decreases compression ratio\.