Current computer systems are inefficient; the average CPU is processing only 30% of the time. What is needed is fine-tuning--better coordination of all system resources. To do this, an evaluation is necessary based on facts obtained through measurement of computer performance. Although software monitors have merit, hardware monitoring is preferred because it doesn't interact with the system.The first hardware monitor was built by IBM in 1961; the latest is the SUM built by Computer Synectics. Monitors work by way of sensors or probes attached to certain signal lines which measure the presence and duration of an electrical impulse without interfering with it. Different signals represent different functions, such as CPU active, I/O channel busy, etc. AND/OR logic enables the monitor to combine functions and produce complete measurement statistics. Results are written on tape.
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Computer performance measurement: where we're at
Warner, C. Dudley
Follow ACM SIGCSIM Installation Management Review
, Volume (5)
Association for Computing Machinery – Aug 1, 1970
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