[poky] build performance: bb-matrix on 4-core (BB_NUMBER_THREADS and PARALLEL_MAKE optimization)

[Robert Berger]

Darren/Richard,

Maybe we could instead of hacking hard coded default values (or nothing)
into the config file default to something like this:

somehow get the number of CPUs:

CPUS=$(grep ^processor /proc/cpuinfo | wc -l)
echo CPUS=${CPUS}

or

CPUS=`getconf _NPROCESSORS_ONLN`
echo CPUS_UBUNTU=${CPUS_UBUNTU}

(don't know if the second one will also work with other distros than Ubuntu)

Do some calculation which magic number for BB_NUMBER_THREADS and
PARALLEL_MAKE to use:

e.g. what was suggested: BB=2*NR_CORES PM=1.5*NR_CORES

Regards,

Robert
...For every complex problem there is a solution which is simple, neat
and wrong. -- H.L. Mencken

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