Abstract

A special occurrence of a phenomenon calledprocessor thrashing caused by processor lockouts within the dispatcher of a symmetric multiprocessor system is studied. Results derived from simulation experiments involving up to 16 processors show that the potential danger of processor thrashing can be reduced noticably by locking only parts of the dispatcher's data during a specific dispatcher operation. The algorithms and data structure of a highly efficient implementation are outlined based on this principle and its performance is compared with a simple monitor realization of a dispatcher.

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