Wouldn't be better to use -j with no argument?
The make manual states:
"If the  -j  option  is given without an argument, make will not limit
 the number of jobs that can run simultaneously."


----- Original Message -----
> On 09.03.2015, stan wrote:
> 
> > But, when I run a compile job with -j6, in order to allow all six
> > cores
> > to be used, it limits the total amount of usage to 100% of a
> > *single*
> > core.  So, it might use all six cores, but the sum of the
> > percentages
> > on those six cores is always around 100% of one core.  This is from
> > htop output.
> 
> This is the CPU scheduler not maximizing usage. Try this next time:
> 
> nice -n -20 make -j6
> 
> Or choose any nice level which fits better for you, "man nice".
> 
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