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[doc] Update CLI help snippet: -T# default and --max #4692

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[doc] Update CLI help snippet: -T# default and --max #4692

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5 changes: 4 additions & 1 deletion programs/README.md
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Expand Up @@ -201,12 +201,15 @@ Advanced options:

Advanced compression options:
--ultra Enable levels beyond 19, up to 22; requires more memory.
--max Set advanced parameters to reach maximum compression.
Warning: very slow and uses a lot of resources; disabled in 32-bit mode.
--fast[=#] Use to very fast compression levels. [Default: 1]
--adapt Dynamically adapt compression level to I/O conditions.
--long[=#] Enable long distance matching with window log #. [Default: 27]
--patch-from=REF Use REF as the reference point for Zstandard's diff engine.

-T# Spawn # compression threads. [Default: 1; pass 0 for core count.]
-T# Spawn # compression threads.
[Default: between 1 and 4 depending on physical CPU cores; pass 0 for core count.]
--single-thread Share a single thread for I/O and compression (slightly different than `-T1`).
--auto-threads={physical|logical}
Use physical/logical cores when using `-T0`. [Default: Physical]
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