My tests find that its fastest to set the number of parallel builds to
1.5 to 2 times the number of cores. I expect that's because some
tasks are CPU bound while other tasks are I/O bound.
In principle, you can get one of each kind going at the same time.
The I/O bound task doesn't use up much of the core's capacity.
Michael David Crawford, Baritone
mdcrawf...@gmail.com
One Must Not Trifle With Wizards For It Makes Us Soggy And Hard To Light.
On Sat, May 28, 2016 at 11:07 AM, Ryan Schmidt <ryandes...@macports.org> wrote:
> On May 27, 2016, at 4:05 PM, Adam Dershowitz wrote:
>
>> On May 27, 2016, at 1:47 PM, Ryan Schmidt 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 build.jobs. Such as:
>>>>> sudo port install port_whatever_name build.jobs=4
>>>>> 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?
>
> It's difficult to tell, because the nice value is not recorded in the log
> anywhere. If it does work, you would do it with:
>
> sudo port install whatever build.nice=20
>
> However, I don't see a downside to setting buildnicevalue in macports.conf.
> If your computer isn't doing anything else, MacPorts gets the CPU time. If
> your computer is doing something else, that something else gets the CPU time.
>
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