Abstract
The ability to accurately time the execution of sequences of machine instructions is an important tool in the tuning and evaluation of computer hardware and software. The complexity of modern hardware and software systems often makes accurate timing information difficult to obtain [1]. This note describes an experimental comparison of timing information provided by a large multiprogramming operating system (OS/360 MVT) with timing information derived directly from a high resolution hardware clock. The hardware clock was found to be a superior source of timing information.
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