ddidderr/zstd-rs
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changed searchLength into minMatch

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refactored all relevant API and calls
for consistency.
This commit is contained in:
Yann Collet
2018-11-20 14:56:07 -08:00
parent 114bd4346e
commit e874dacc08
18 changed files with 197 additions and 134 deletions
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programs/zstd.1.md
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@@ -383,13 +383,13 @@ The list of available _options_:
The minimum _slog_ is 1 and the maximum is 26.
- `searchLength`=_slen_, `slen`=_slen_:
- `minMatch`=_mml_, `mml`=_mml_:
Specify the minimum searched length of a match in a hash table.
Larger search lengths usually decrease compression ratio but improve
decompression speed.
The minimum _slen_ is 3 and the maximum is 7.
The minimum _mml_ is 3 and the maximum is 7.
- `targetLen`=_tlen_, `tlen`=_tlen_:
The impact of this field vary depending on selected strategy.
@@ -420,7 +420,7 @@ The list of available _options_:
Default _ovlog_ is 6, which means "reload `windowSize / 8`".
Exception : the maximum compression level (22) has a default _ovlog_ of 9.
- `ldmHashLog`=_ldmhlog_, `ldmhlog`=_ldmhlog_:
- `ldmHashLog`=_lhlog_, `lhlog`=_lhlog_:
Specify the maximum size for a hash table used for long distance matching.
This option is ignored unless long distance matching is enabled.
@@ -428,18 +428,18 @@ The list of available _options_:
Bigger hash tables usually improve compression ratio at the expense of more
memory during compression and a decrease in compression speed.
The minimum _ldmhlog_ is 6 and the maximum is 26 (default: 20).
The minimum _lhlog_ is 6 and the maximum is 26 (default: 20).
- `ldmSearchLength`=_ldmslen_, `ldmslen`=_ldmslen_:
- `ldmMinMatch`=_lmml_, `lmml`=_lmml_:
Specify the minimum searched length of a match for long distance matching.
This option is ignored unless long distance matching is enabled.
Larger/very small values usually decrease compression ratio.
The minimum _ldmslen_ is 4 and the maximum is 4096 (default: 64).
The minimum _lmml_ is 4 and the maximum is 4096 (default: 64).
- `ldmBucketSizeLog`=_ldmblog_, `ldmblog`=_ldmblog_:
- `ldmBucketSizeLog`=_lblog_, `lblog`=_lblog_:
Specify the size of each bucket for the hash table used for long distance
matching.
@@ -448,9 +448,9 @@ The list of available _options_:
Larger bucket sizes improve collision resolution but decrease compression
speed.
The minimum _ldmblog_ is 0 and the maximum is 8 (default: 3).
The minimum _lblog_ is 0 and the maximum is 8 (default: 3).
- `ldmHashEveryLog`=_ldmhevery_, `ldmhevery`=_ldmhevery_:
- `ldmHashEveryLog`=_lhevery_, `lhevery`=_lhevery_:
Specify the frequency of inserting entries into the long distance matching
hash table.
@@ -459,13 +459,13 @@ The list of available _options_:
Larger values will improve compression speed. Deviating far from the
default value will likely result in a decrease in compression ratio.
The default value is `wlog - ldmhlog`.
The default value is `wlog - lhlog`.
### Example
The following parameters sets advanced compression options to something
similar to predefined level 19 for files bigger than 256 KB:
`--zstd`=wlog=23,clog=23,hlog=22,slog=6,slen=3,tlen=48,strat=6
`--zstd`=wlog=23,clog=23,hlog=22,slog=6,mml=3,tlen=48,strat=6
### -B#:
Select the size of each compression job.