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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. memory and become problematic with parallelism elsewhere in the build.
"50%" has been found to be a good value. "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.