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In validating a simulation model of a computer system, measurements of execution times for program modules are often required. Clocks available today for such purposes run discretely. They click at certain time intervals, some on the order of microseconds, others in milliseconds. For technical as well as economical reasons, the one we use clicks every 16.666 milliseconds. Therefore, if both the beginning and ending of the execution of a program module fall inside the 16.666 ms interval between two consecutive clicks, the execution time T will be recorded as zero. On the other hand, if the beginning of the execution occurs shortly before a click, the recorded execution time will be 16.666 ms, no matter how short the actual execution time may be, as long as it ends after the click. Based on such unreliable data, a procedure is derived to yield a reliable estimate of T.

Computer program execution time and discrete clock