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Math Forum / Math Software / MATLAB / July 2009CPU Core Usage
I'm trying to figure out how I can assign a ML session to explicitly use a given number of CPU cores. For example, if I have 4 cores c1, c2, c3 and c4 and two ML sessions m1 and m2 how can I designate m1 to use only c1 and c2 and m2 to use only c3 and c4. It seems like ML uses whoever and whatever is first available. This probably doesn't make any difference but if I have a process that is using 25% of one of the cores I want to make sure ML doesn't touch that core. maxNumCompThreads only specifies how many cores that session is allowed to use which is why I'm asking how I can take this a step further and assign the session its own core. > I'm trying to figure out how I can assign a ML session to explicitly use > a given number of CPU cores. For example, if I have 4 cores c1, c2, c3 [quoted text clipped - 7 lines] > to use which is why I'm asking how I can take this a step further and > assign the session its own core. I would expect this control to be with the OS rather than the application. In Windows, you can set the processor affinity for a particular process using the task manager if you so want. I would suggest leaving the load balancing to the OS in most cases. > I'm trying to figure out how I can assign a ML session to > explicitly use a given number of CPU cores. For example, if > I have 4 cores c1, c2, c3 and c4 and two ML sessions m1 and > m2 how can I designate m1 to use only c1 and c2 and m2 to use > only c3 and c4. It seems like ML uses whoever and whatever > is first available. This probably doesn't make any This is normally handled by the OS, not the application. So- to do what you want you'll most likely need to dig out the correct kernel calls to assign the processes to specified cores. Not that second-guessing the OS could turn into a real can of worms since your algorithm for choosing resources is most likely not as good as what the OS already has, but it is certainly doable. Whatever you OS, look for system calls related to processor affinity. Stan |
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