krak/zstd
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clarify when to use '--single-thread' with '--patch-from'

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Using '--single-thread' with '--patch-from' on compression levels above 15 will lead to significantly worse compression ratios.

Corrected the man page not suggest anymore to do this.
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@RubenKelevra 2024-07-07 19:43:49 +02:00 committed by GitHub
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programs/zstd.1.md
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@ -174,8 +174,10 @@ the last one takes effect.
(_fileLog_ being the _windowLog_ required to cover the whole file). You
can also manually force it.
Note: for all levels, you can use `--patch-from` in `--single-thread` mode
to improve compression ratio at the cost of speed.
Note: up to level 15, you can use `--patch-from` in `--single-thread` mode
to improve compression ratio marginally at the cost of speed. Using
'--single-thread' above level 15 will lead to lower compression
ratios.
Note: for level 19, you can get increased compression ratio at the cost
of speed by specifying `--zstd=targetLength=` to be something large