| 摘要 |
To reduce the total power consumption of a computer system, a supervisory control method is used to detect a substantial rest state of a CPU wherein it is waiting for a substantial task to start while repeatedly executing a small loop program. The method includes a step addresses accessed by the CPU in a predetermined period of time Ta are stored in proper address blocks, the stored addresses being defined as a learned address, and a step wherein a check is made to see if the CPU accesses an address other than the learned address in a predetermined period of time Tb. When no access of the CPU to any address other than the learned address is detected in the checking step, the both steps are repeated until it is detected in the checking step that an address other than the learned address is accessed by the CPU. In this instance, at least the time Ta is reduced for each repetition of the both steps. Then, it is checked whether or not the CPU accesses to an address other than the learned address in a predetermined period of time Tc which is longer than the time Ta. If not, then it is decided it is highly probable that the CPU is in the substantial rest state. |
