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ref-manual: Updates to BB_NUMBER_THREADS and PARALLEL_MAKE.

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Noted that if these variables are not set, they both default
to the number of cores the build system has.

(From yocto-docs rev: 8654aeb91f734628bffda9d5de0cdc9ea27d3f67)

Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Scott Rifenbark
2014-01-29 12:23:29 -06:00
committed by Richard Purdie
parent beb54ff6f7
commit ec0f9cf85a
1 changed files with 17 additions and 3 deletions
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20
documentation/ref-manual/ref-variables.xml
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@@ -547,9 +547,18 @@
<glossentry id='var-BB_NUMBER_THREADS'><glossterm>BB_NUMBER_THREADS</glossterm>
<glossdef>
<para>The maximum number of tasks BitBake should run in parallel at any one time.
If your host development system supports multiple cores, a good rule of thumb
is to set this variable to twice the number of cores.</para>
<para>
The maximum number of tasks BitBake should run in parallel
at any one time.
If your host development system supports multiple cores,
a good rule of thumb is to set this variable to twice the
number of cores.
</para>
<para>
The default value for <filename>BB_NUMBER_THREADS</filename>
is equal to the number of cores your build system has.
</para>
</glossdef>
</glossentry>
@@ -4792,9 +4801,14 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
<filename>-j 4</filename>, where the number
represents the maximum number of parallel threads make can
run.
</para>
<para>
If you development host supports multiple cores a good
rule of thumb is to set this variable to twice the number
of cores on the host.
If you do not set <filename>PARALLEL_MAKE</filename>, it
defaults to the number of cores your build system has.
<note>
Individual recipes might clear out this variable if
the software being built has problems running its