Some clarification is in order, when I say “thread” I mean engaging a different core, or “hardware thread” (I am talking about true parallel programming here, not spawning new threads on the same core, which is Hyper-Threading).
By load, I mean processing time, against frequency (CPU cycles) in other words, you are running out of CPU cycles, because on that core load have reached 100% utilization….
At this time, as per my understanding, C++ or other languages, can not automatically engage, other cores, based on high load on core 1. (unless windows scheduler is being utilized, not sure about MACs)
So better to launch multiple tasks and divide your work amongst them, not 16 perhaps 4, if you have 4 cores, try it or your money back LOL!