use of cpus in building

Adam Dershowitz dersh at
Fri May 27 14:05:43 PDT 2016

> On May 27, 2016, at 1:47 PM, Ryan Schmidt <ryandesign at> wrote:
> On May 25, 2016, at 5:07 PM, Justin C. Walker wrote:
>> On May 25, 2016, at 14:42 , Adam Dershowitz wrote:
>>> You can also manually change it for a single install, for example by using  Such as:
>>> sudo port install port_whatever_name 
>>> and then, for that specific install it will attempt to use 4 cores.  This can be handy to reduce the number of cores used, from the default, so that you can do other things on the machine while building. 
> Instead, consider changing buildnicevalue in macports.conf from 0 to a greater number, up to 20. When MacPorts is configured to be "nice" it means that if other programs running on your computer need CPU time, they'll get it first.

Can this also be done on the command line for a specific install, instead of changing the config file?  

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