| 摘要 |
PROBLEM TO BE SOLVED: To surely reduce the increase of the activity ratio of a CPU due to the execution of a program designated by a command, and to always preferentially use the residual part of the CPU for the other processing in which a request for real time performance is strict. SOLUTION: A process start controlling function part 13 controls the operation of a command by referring to the activity ratio of a CPU at the time of starting a process to be controlled according to an inputted command. A CPU activity ratio measuring function part 14 measures the activity ratio of a CPU. A process controlling function part 15 executes the process to be controlled designated by the inputted command in a prescribed time, and allows a CPU use time measuring function part 17 to measure a CPU time used by the process to be controlled. The process controlling function part 15 calculates the CPU activity ratio from the rate of the CPU time to the prescribed time. The process controlling function part 15 calculates a temporary stopping time for temporarily stopping the process to be controlled in the prescribed time so that the calculated CPU activity ratio can be prevented from exceeding a prescribed upper limit value.
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