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A complete description of a computer system must include three groups of components: 1. The hardware components 2. The software components (the operating system), and 3. The load components (the stream of tasks to be processed). When computer systems are simulated all of these components are found as features of the simulations. The hardware normally appears as a collection of tables and associated operational data. The operating system appears both as tables and as scheduling or assignment algorithms. The load is represented either as a sequence of requests for service (use of system resources) or as a set of functions which can generate such a sequence of requests. In many applications, the description of the load turns out to be the most difficult task. This paper discusses some techniques and procedures which have been used to automatically generate the required load descriptions. The emphasis is on a request sequence generator which uses data found in a system event trace. One such technique, called trace-driven modeling, has been implemented at the Purdue University Computing Center. This implementation is discussed and its usefulness and accuracy are illustrated with actual data.

Simulation of computer systems using automatically generated load descriptions