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.TP
\fBldmHashLog\fR=\fIlhlog\fR, \fBlhlog\fR=\fIlhlog\fR
Specify the maximum size for a hash table used for long distance matching\.
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.IP
This option is ignored unless long distance matching is enabled\.
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.IP
Bigger hash tables usually improve compression ratio at the expense of more memory during compression and a decrease in compression speed\.
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.IP
The minimum \fIlhlog\fR is 6 and the maximum is 26 (default: 20)\.
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.TP
\fBldmMinMatch\fR=\fIlmml\fR, \fBlmml\fR=\fIlmml\fR
Specify the minimum searched length of a match for long distance matching\.
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.IP
This option is ignored unless long distance matching is enabled\.
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.IP
Larger/very small values usually decrease compression ratio\.
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.IP
The minimum \fIlmml\fR is 4 and the maximum is 4096 (default: 64)\.
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.TP
\fBldmBucketSizeLog\fR=\fIlblog\fR, \fBlblog\fR=\fIlblog\fR
Specify the size of each bucket for the hash table used for long distance matching\.
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.IP
This option is ignored unless long distance matching is enabled\.
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.IP
Larger bucket sizes improve collision resolution but decrease compression speed\.
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.IP
The minimum \fIlblog\fR is 0 and the maximum is 8 (default: 3)\.
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.TP
\fBldmHashRateLog\fR=\fIlhrlog\fR, \fBlhrlog\fR=\fIlhrlog\fR
Specify the frequency of inserting entries into the long distance matching hash table\.
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.IP
This option is ignored unless long distance matching is enabled\.
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.IP
Larger values will improve compression speed\. Deviating far from the default value will likely result in a decrease in compression ratio\.
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.IP
The default value is \fBwlog \- lhlog\fR\.
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.SS "Example"
The following parameters sets advanced compression options to something similar to predefined level 19 for files bigger than 256 KB:
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.P
\fB\-\-zstd\fR=wlog=23,clog=23,hlog=22,slog=6,mml=3,tlen=48,strat=6
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.SS "\-B#:"
Select the size of each compression job\. This parameter is available only when multi\-threading is enabled\. Default value is \fB4 * windowSize\fR, which means it varies depending on compression level\. \fB\-B#\fR makes it possible to select a custo...
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.SH "BUGS"
Report bugs at: https://github\.com/facebook/zstd/issues
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.SH "AUTHOR"
Yann Collet