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updated --single-thread man

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Yann Collet
2022-06-07 17:45:15 -07:00
parent 802ad778cc
commit 27bf96e72b
2 changed files with 218 additions and 56 deletions
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programs/zstd.1.md
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@@ -118,12 +118,13 @@ the last one takes effect.
which is either 64 in 32-bit mode, or 256 for 64-bit environments.
This modifier does nothing if `zstd` is compiled without multithread support.
* `--single-thread`:
Does not spawn a thread for compression, use a single thread for both I/O and compression.
In this mode, compression is serialized with I/O, which is slightly slower.
(This is different from `-T1`, which spawns 1 compression thread in parallel of I/O).
This mode is the only one available when multithread support is disabled.
Single-thread mode features lower memory usage.
Final compressed result is slightly different from `-T1`.
Use a single thread for both I/O and compression.
As compression is serialized with I/O, this can be slightly slower.
Single-thread mode features significantly lower memory usage,
which can be useful for systems with limited amount of memory, such as 32-bit systems.
Note 1 : this mode is the only available one when multithread support is disabled.
Note 2 : this mode is different from `-T1`, which spawns 1 compression thread in parallel with I/O.
Final compressed result is also slightly different from `-T1`.
* `--auto-threads={physical,logical} (default: physical)`:
When using a default amount of threads via `-T0`, choose the default based on the number
of detected physical or logical cores.