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updated documentation regarding minimum job size

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Yann Collet
2021-05-05 09:03:11 -07:00
parent 53a60e98de
commit 455fd1a067
5 changed files with 17 additions and 14 deletions
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programs/zstd.1.md
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@@ -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
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