updated documentation regarding minimum job size

lib/zstd.h

@@ -402,7 +402,7 @@ typedef enum {
     ZSTD_c_jobSize=401,      /* Size of a compression job. This value is enforced only when nbWorkers >= 1.
                               * Each compression job is completed in parallel, so this value can indirectly impact the nb of active threads.
                               * 0 means default, which is dynamically determined based on compression parameters.
-                              * Job size must be a minimum of overlap size, or 1 MB, whichever is largest.
+                              * Job size must be a minimum of overlap size, or ZSTDMT_JOBSIZE_MIN (= 512 KB), whichever is largest.
                               * The minimum size is automatically and transparently enforced. */
     ZSTD_c_overlapLog=402,   /* Control the overlap size, as a fraction of window size.
                               * The overlap size is an amount of data reloaded from previous job at the beginning of a new job.

programs/zstd.1

@@ -1,5 +1,5 @@
 .
-.TH "ZSTD" "1" "March 2021" "zstd 1.4.9" "User Commands"
+.TH "ZSTD" "1" "May 2021" "zstd 1.4.10" "User Commands"
 .
 .SH "NAME"
 \fBzstd\fR \- zstd, zstdmt, unzstd, zstdcat \- Compress or decompress \.zst files
@@ -343,6 +343,9 @@ set process priority to real\-time
 .
 .SH "ADVANCED COMPRESSION OPTIONS"
 .
+.SS "\-B#:"
+Select the size of each compression job\. This parameter is only available when multi\-threading is enabled\. Each compression job is run in parallel, so this value indirectly impacts the nb of active threads\. Default job size varies depending on compression level (generally \fB4 * windowSize\fR)\. \fB\-B#\fR makes it possible to manually select a custom size\. Note that job size must respect a minimum value which is enforced transparently\. This minimum is either 512 KB, or \fBoverlapSize\fR, whichever is largest\. Different job sizes will lead to (slightly) different compressed frames\.
+.
 .SS "\-\-zstd[=options]:"
 \fBzstd\fR provides 22 predefined compression levels\. The selected or default predefined compression level can be changed with advanced compression options\. The \fIoptions\fR are provided as a comma\-separated list\. You may specify only the options you want to change and the rest will be taken from the selected or default compression level\. The list of available \fIoptions\fR:
 .
@@ -481,9 +484,6 @@ The following parameters sets advanced compression options to something similar
 .P
 \fB\-\-zstd\fR=wlog=23,clog=23,hlog=22,slog=6,mml=3,tlen=48,strat=6
 .
-.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 custom value\. Note that job size must respect a minimum value which is enforced transparently\. This minimum is either 1 MB, or \fBoverlapSize\fR, whichever is largest\.
-.
 .SH "BUGS"
 Report bugs at: https://github\.com/facebook/zstd/issues
 .

programs/zstd.1.md

@@ -423,6 +423,16 @@ BENCHMARK
 
 ADVANCED COMPRESSION OPTIONS
 ----------------------------
+### -B#:
+Select the size of each compression job.
+This parameter is only available when multi-threading is enabled.
+Each compression job is run in parallel, so this value indirectly impacts the nb of active threads.
+Default job size varies depending on compression level (generally  `4 * windowSize`).
+`-B#` makes it possible to manually select a custom size.
+Note that job size must respect a minimum value which is enforced transparently.
+This minimum is either 512 KB, or `overlapSize`, whichever is largest.
+Different job sizes will lead to (slightly) different compressed frames.
+
 ### --zstd[=options]:
 `zstd` provides 22 predefined compression levels.
 The selected or default predefined compression level can be changed with
@@ -566,13 +576,6 @@ similar to predefined level 19 for files bigger than 256 KB:
 
 `--zstd`=wlog=23,clog=23,hlog=22,slog=6,mml=3,tlen=48,strat=6
 
-### -B#:
-Select the size of each compression job.
-This parameter is available only when multi-threading is enabled.
-Default value is `4 * windowSize`, which means it varies depending on compression level.
-`-B#` makes it possible to select a custom value.
-Note that job size must respect a minimum value which is enforced transparently.
-This minimum is either 1 MB, or `overlapSize`, whichever is largest.
 
 BUGS
 ----

programs/zstdgrep.1

@@ -1,5 +1,5 @@
 .
-.TH "ZSTDGREP" "1" "March 2021" "zstd 1.4.9" "User Commands"
+.TH "ZSTDGREP" "1" "May 2021" "zstd 1.4.10" "User Commands"
 .
 .SH "NAME"
 \fBzstdgrep\fR \- print lines matching a pattern in zstandard\-compressed files

programs/zstdless.1

@@ -1,5 +1,5 @@
 .
-.TH "ZSTDLESS" "1" "March 2021" "zstd 1.4.9" "User Commands"
+.TH "ZSTDLESS" "1" "May 2021" "zstd 1.4.10" "User Commands"
 .
 .SH "NAME"
 \fBzstdless\fR \- view zstandard\-compressed files