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documentation: BB_NUMBER_THREADS and PARALLEL_MAKE suggestions

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Text that suggests setting the BB_NUMBER_THREADS and
PARALLEL_MAKE variables to speed build time has been updated to
suggest a setting of twice the number of host cores supported.

The 2x number came to light through a discussion on the project
mailing list initiated by Robert P. J. Day.

Reported-by: Robert P. J. Day
(From yocto-docs rev: 1846b41a595b7bd905ca828eaa04112d1533d7a1)

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
2011-11-16 09:42:53 -08:00
committed by Richard Purdie
parent 4cb3862f6a
commit affc8b985a
4 changed files with 11 additions and 14 deletions
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documentation/yocto-project-qs/yocto-project-qs.xml
+1 -4
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@@ -410,11 +410,8 @@
<ulink url='http://www.yoctoproject.org/docs/latest/poky-ref-manual/poky-ref-manual.html#var-PARALLEL_MAKE'><filename>PARALLEL_MAKE</filename></ulink> variables.
By default, these variables are commented out.
However, if you have a multi-core CPU you might want to uncomment
the lines and set the variable
<filename>BB_NUMBER_THREADS</filename> equal to twice the number of your
the lines and set both variables equal to twice the number of your
host's processor cores.
Also, you could set the variable <filename>PARALLEL_MAKE</filename> equal to
1.5 times the number of processor cores.
Setting these variables can significantly shorten your build time.
</para>