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updated documentation 

introducing ZSTD_btultra2
dev
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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2
lib/zstd.h
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@ -541,7 +541,7 @@ typedef enum {
* , for all strategies > fast, effective maximum is 6.
* Special: value 0 means "use default minMatchLength". */
ZSTD_c_targetLength=106, /* Impact of this field depends on strategy.
* For strategies btopt & btultra:
* For strategies btopt, btultra & btultra2:
* Length of Match considered "good enough" to stop search.
* Larger values make compression stronger, and slower.
* For strategy fast:

6
programs/zstd.1
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@ -1,5 +1,5 @@
.
.TH "ZSTD" "1" "November 2018" "zstd 1.3.8" "User Commands"
.TH "ZSTD" "1" "December 2018" "zstd 1.3.8" "User Commands"
.
.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\.
.
.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\.
.
.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\.
.
.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\.
.
.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\.

11
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.

2
programs/zstdgrep.1
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@ -1,5 +1,5 @@
.
.TH "ZSTDGREP" "1" "November 2018" "zstd 1.3.8" "User Commands"
.TH "ZSTDGREP" "1" "December 2018" "zstd 1.3.8" "User Commands"
.
.SH "NAME"
\fBzstdgrep\fR \- print lines matching a pattern in zstandard\-compressed files

2
programs/zstdless.1
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@ -1,5 +1,5 @@
.
.TH "ZSTDLESS" "1" "November 2018" "zstd 1.3.8" "User Commands"
.TH "ZSTDLESS" "1" "December 2018" "zstd 1.3.8" "User Commands"
.
.SH "NAME"
\fBzstdless\fR \- view zstandard\-compressed files