ddidderr/zstd-rs
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Change default f to 20

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This commit is contained in:
Jennifer Liu
2018-09-04 17:15:14 -07:00
parent 7a02df8dbe
commit 21721b75a3
5 changed files with 7 additions and 7 deletions
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programs/zstd.1
+1 -1
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@@ -244,7 +244,7 @@ Examples:
Same as cover but with extra parameters \fIf\fR and \fIaccel\fR and different default value of split
.
.IP
If \fIsplit\fR is not specified, then it tries \fIsplit\fR = 75. If \fIf\fR is not specified, then it tries \fIf\fR = 18. Requires that 0 < \fIf\fR < 32. If \fIaccel\fR is not specified, then it tries \fIaccel\fR = 1. Requires that 0 < \fIaccel\fR <= 10. Requires that \fId\fR = 6 or \fId\fR = 8.
If \fIsplit\fR is not specified, then it tries \fIsplit\fR = 75. If \fIf\fR is not specified, then it tries \fIf\fR = 20. Requires that 0 < \fIf\fR < 32. If \fIaccel\fR is not specified, then it tries \fIaccel\fR = 1. Requires that 0 < \fIaccel\fR <= 10. Requires that \fId\fR = 6 or \fId\fR = 8.
.
.IP
\fIf\fR is log of size of array that keeps track of frequency of subsegments of size \fId\fR. The subsegment is hashed to an index in the range [0,2^\fIf\fR - 1]. It is possible that 2 different subsegments are hashed to the same index, and they are considered as the same subsegment when computing frequency. Using a higher \fIf\fR reduces collision but takes longer.
programs/zstd.1.md
+1 -1
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@@ -258,7 +258,7 @@ Compression of small files similar to the sample set will be greatly improved.
* `--train-fastcover[=k#,d=#,f=#,steps=#,split=#,accel=#]`:
Same as cover but with extra parameters _f_ and _accel_ and different default value of split
If _split_ is not specified, then it tries _split_ = 75.
If _f_ is not specified, then it tries _f_ = 18.
If _f_ is not specified, then it tries _f_ = 20.
Requires that 0 < _f_ < 32.
If _accel_ is not specified, then it tries _accel_ = 1.
Requires that 0 < _accel_ <= 10.
programs/zstdcli.c
+1 -1
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@@ -356,7 +356,7 @@ static ZDICT_fastCover_params_t defaultFastCoverParams(void)
ZDICT_fastCover_params_t params;
memset(&params, 0, sizeof(params));
params.d = 8;
params.f = 18;
params.f = 20;
params.steps = 4;
params.splitPoint = 0.75; /* different from default splitPoint of cover */
params.accel = DEFAULT_ACCEL;