documentation/yocto-project-qs/yocto-project-qs.xml: multi-core update

Added text suggesting that BB_NUMBER_THREADS be set to twice the number
of available processor cores and that PARALLEL_MAKE be set equal to the
number of processor cores.  Similar changes were made to local.conf
based on work by Josh.

(From yocto-docs rev: e342a4af4d3ba000b348bbb9d125977fc0e95273)

Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/documentation/yocto-project-qs/yocto-project-qs.xml b/documentation/yocto-project-qs/yocto-project-qs.xml
index 65728fb42f..bc40cbbeb3 100644
--- a/documentation/yocto-project-qs/yocto-project-qs.xml
+++ b/documentation/yocto-project-qs/yocto-project-qs.xml
@@ -288,8 +288,10 @@
          <para>
              Take some time to examine your <filename>conf/local.conf</filename> file.  
              The defaults should work fine.  
-             However, if you have a multi-core CPU you might want to set the variables
-             BB_NUMBER_THREADS and PARALLEL_MAKE to the number of processor cores on your build machine.
+             However, if you have a multi-core CPU you might want to set the variable
+             BB_NUMBER_THREADS equal to twice the number of processor cores your system has.
+             And, set the variable PARALLEL_MAKE equal to the number of processor cores.
+             Setting these variables can significantly shorten your build time.
              By default, these variables are commented out.
          </para>
          <para>