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ref-manual: add ZSTD_THREADS

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ZSTD_THREADS is new for kirkstone.

(From yocto-docs rev: b970936b89bebb184c82be3a9514a9eba7c04f9b)

Signed-off-by: Paul Eggleton <paul.eggleton@microsoft.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Paul Eggleton
2022-04-22 12:45:45 +01:00
committed by Richard Purdie
parent e2cb52612e
commit d653a43665
1 changed files with 13 additions and 0 deletions
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documentation/ref-manual/variables.rst
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@@ -8779,3 +8779,16 @@ system and gives an overview of their function and contents.
memory and become problematic with parallelism elsewhere in the build.
"50%" has been found to be a good value.
:term:`ZSTD_THREADS`
Specifies the number of parallel threads that should be used when
using ZStandard compression.
By default this scales with core count, but is never set less than 2
to ensure that multi-threaded mode is always used so that the output
file contents are deterministic. Builds will work with a value of 1
but the output will differ compared to the output from the compression
generated when more than one thread is used.
On systems where many tasks run in parallel, setting a limit to this
can be helpful in controlling system resource usage.