N. Suzuki, and S. Uno, "Information processing system having power saving control of the processor clock," United States Patent #5,189,647, Feb. 1993.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....until the next interrupt occurs. With a well designed operating system, this can be deduced from the current status of all processes. Thus, whenever any process is running or ready to run, the processor should not be turned off; when all processes are blocked, the processor should be turned off [34 36]. Examples of operating systems using this strategy are Windows [37, 38] and UNIX. MacOS, however, uses a different strategy, perhaps because its strategy was designed when processors did suffer side effects from turning off. It uses an inactivity threshold, as is commonly used for hard disk ....

N. Suzuki, and S. Uno, "Information processing system having power saving control of the processor clock," United States Patent #5,189,647, Feb. 1993.

....until the next interrupt occurs. With a welldesigned operating system, this can be deduced from the current status of all processes. Thus, whenever any process is running or ready to run, the processor should not be turned off; when all processes are blocked, the processor should be turned off [49, 72, 74]. Examples of operating systems using this strategy are Windows [15, 62] and UNIX. MacOS, however, uses a different strategy, perhaps because its strategy was designed when processors did suffer side effects from turning off. It uses an inactivity threshold, as is commonly used for hard disk power ....

Suzuki, N. and Uno, S. Information processing system having power saving control of the processorclock. United States Patent #5,189,647, February 1993.

....the processor back on when an external event occurs. An essentially equivalent version of this strategy, namely to establish a virtual lowest priority process whose job is to turn off the processor when it runs, is recommended by Suessmith and Paap [16] for the PowerPC 603, and by Suzuki and Uno [17] in a 1993 patent. Such a virtual lowest priority process has in the past been called the idle loop, and in mainframes typically lighted a bulb on the console. 1.1 Why it isn t trivial We refer to the strategy of turning off the processor when no process is available to run the basic ....

N. Suzukiand S. Uno. Information ProcessingSystemHaving Power Saving Control of the Processor Clock, United States Patent #5,189,647, 1993.

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