For some simulation work-loads I have, I would like to use the system to its full potential and therefore use both P and E cores. Splitting the work-load into individual tasks is not easily possible (the threads communicate with each other and run in semi-lockstep). I can allocate smaller portions of the domain to the E cores (and iteratively adjust this so they take the same amount of time as the P cores).
But in order for this to work well, I need to ensure that a given thread (with its associated workload) is bound to the right type of core: *either* the performance (doing larger chunks of the domain) or the efficiency (doing smaller chunks of the domain) cores.
What's the best way to do this? So far, I don't think thread-to-core affinity has been something that was choosable in macOS.
The documentation mentioned the QoS classes, but which class(es) (or relative priorities) would I pick?
The existing classifications don't really map well, the work is user-initiated (i.e. they launched a console application), but not a GUI program. Would I use 4 threads with QOS_CLASS_UTILITY and 4 with QOS_CLASS_BACKGROUND? Would I just use UTILITY with relative priority for performance vs. efficiency cores?
But in order for this to work well, I need to ensure that a given thread (with its associated workload) is bound to the right type of core: *either* the performance (doing larger chunks of the domain) or the efficiency (doing smaller chunks of the domain) cores.
What's the best way to do this? So far, I don't think thread-to-core affinity has been something that was choosable in macOS.
The documentation mentioned the QoS classes, but which class(es) (or relative priorities) would I pick?
Code Block c pthread_set_qos_class_self_np(QOS_CLASS_UTILITY, 0);
The existing classifications don't really map well, the work is user-initiated (i.e. they launched a console application), but not a GUI program. Would I use 4 threads with QOS_CLASS_UTILITY and 4 with QOS_CLASS_BACKGROUND? Would I just use UTILITY with relative priority for performance vs. efficiency cores?
