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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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11
documentation/dev-manual/dev-manual-kernel-appendix.xml
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@@ -221,9 +221,9 @@
If your host development system supports multi-core and multi-thread capabilities,
you can uncomment these statements and set the variables to significantly shorten
the full build time.
As a guideline, set <filename>BB_NUMBER_THREADS</filename> to twice the number
of cores your machine supports and set <filename>PARALLEL_MAKE</filename> to one and
a half times the number of cores your machine supports.
As a guideline, set both <filename>BB_NUMBER_THREADS</filename> and
<filename>PARALLEL_MAKE</filename> to twice the number
of cores your machine supports.
</note>
</para>
<para>
@@ -390,9 +390,8 @@
build time if your host supports multi-core and multi-thread capabilities:
<filename>BB_NUMBER_THREADS</filename> and <filename>PARALLEL_MAKE</filename>.
If the host system has multiple cores then you can optimize build time
by setting <filename>BB_NUMBER_THREADS</filename> to twice the number of
cores and setting <filename>PARALLEL_MAKE</filename> to one and a half times the
number of cores.</para></listitem>
by setting both these variables to twice the number of
cores.</para></listitem>
<listitem><para><emphasis>Identify Your <filename>meta-kernel-dev</filename>
Layer:</emphasis> The <filename>BBLAYERS</filename> variable in the
<filename>bblayers.conf</filename> file found in the