On 11/30/2015 12:48 PM, Seth Arnold wrote: > On Sat, Nov 28, 2015 at 09:02:18PM -0800, John Johansen wrote: >> This check is well above the range of values I would recommend (some >> where between 1-2x the number of cpus. More jobs can help with smaller > > Two times makes more sense for most CPUs but eight may be more appropriate > for e.g. POWER8 systems; I don't know if the online CPUs count includes > only cores or if the hardware threads are reported too. If only cores, > then even eight might be low for those beasts but if threads are reported > too, this might be high for even them. But _some_ limit is certainly best, > and this is as good a starting point as any inthe absense of data. > right, it is unclear exactly what _SC_NPROCESSORS_ONLN returns, so I fudged as guess, that shouldn't be to harmful. For I/O bound work loads using more workers than cpus doesn't hurt, though realistically most compiles are more cpu bound than I/O bound.
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