Re: PARALLEL_MAKE

[Khem Raj <raj.khem@gmail.com>]

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On Thursday 12 March 2009 16:32:16 Ulf Samuelsson wrote:
> Is there any activity to make this more useful?
> Just managed to install a Core i7 machine, which speeded
> up my Buildroot build from about 4 hours to less than 1 hour.
> (There was an error in the build right at the end,
> so it could have been downto 40 minutes or so)
> Building the cross compiler took 10 minutes with "make -j 16"
> compared to 1-2 hours on a P4 @ 3GHz.
>
> Openembedded does not seem to use PARALLEL_MAKE extensively.
> I have the frequency meter activated for all 8 CPUs in the Core i7,
> and most of the time the CPUs seems to idle at 1.6 GHz,
> with one CPU (or rarely 2) are running at the full 2.67 GHz.
>
> Last time I built OE on a P4@ 3 GHz it took ~40 hours
> for the SAM9263, so some speedup would be nice.
> Maybe we should make an effort?

I use 

PARALLEL_MAKE = "-j4" 
BB_NUMBER_THREADS = "2"

in my local.conf. I see my core 2 duo machine spawning parallel tasks.

-- 
Khem Raj

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