Operating system principles
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An algorithm which is used to measure occupancy in Stromberg-Carlson's Digital Central Office (DCO) call processors is presented. The method is self-calibrating, making it independent of differences in processor speed, type, and other variables which affect processor performance. Required is an external event generator which can generate an event to the processor at fixed time intervals. Calibration needs one time interval with no events to occur before valid occupancy measurements may be made. No clock internal to the processor is required. The method is highly accurate even at high occupancies and incurs very little processor overhead to perform its measurements. Processor occupancy can be displayed at the end of any user-specified time period.