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On Tue, Mar 6, 2012 at 8:44 AM, Chuck Anderson <cra at wpi.edu> wrote: > On Tue, Mar 06, 2012 at 04:27:07AM -0500, Shirley M?rquez D?lcey wrote: >> The fact that the correct strategy for maximum performance may be >> different from the best power management strategy is likely to require >> new OS capabilities (changing the scheduling strategy based on power >> management settings). If I have four things running on a desktop system >> I'd likely prefer to spread them among all four modules for maximum >> speed, but on a laptop I might prefer to put them on only two modules >> and take the performance hit to get the power reduction of shutting off >> the other two modules. > > I'm not so sure you would gain anything by shutting off modules. ?It > was found with CPU frequency governors that slowing down a processor > actually used MORE power, because it took longer to complete running > tasks. ?It is better to have the CPU always run as fast as it can > while there are running tasks, and then halt the processor when it is > truley idle. Depends on the kind of task. Some tasks have time limits (viewing a video) rather then fixed computational goals. Bill Bogstad
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