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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> <glossentry id='var-BB_NUMBER_THREADS'><glossterm>BB_NUMBER_THREADS</glossterm>
<glossdef> <glossdef>
<para>The maximum number of tasks BitBake should run in parallel at any one time. <para>
If your host development system supports multiple cores, a good rule of thumb The maximum number of tasks BitBake should run in parallel
is to set this variable to twice the number of cores.</para> 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> </glossdef>
</glossentry> </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 <filename>-j 4</filename>, where the number
represents the maximum number of parallel threads make can represents the maximum number of parallel threads make can
run. run.
</para>
<para>
If you development host supports multiple cores a good If you development host supports multiple cores a good
rule of thumb is to set this variable to twice the number rule of thumb is to set this variable to twice the number
of cores on the host. 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> <note>
Individual recipes might clear out this variable if Individual recipes might clear out this variable if
the software being built has problems running its the software being built has problems running its