Capacity and performance analysis of computer systems
WSC '94 Proceedings of the 26th conference on Winter simulation
Simulation of computer systems and applications
Proceedings of the 29th conference on Winter simulation
Array-driven simulation of real databases
Proceedings of the 30th conference on Winter simulation
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LEXIS-NEXIS frequently develops simulation models to estimate the computer system capacity required to deliver on-line information services. The load imposed by Unix Input/Output (I/O) processes is a key factor in many of these models. However, the I/O processes themselves are seldom of interest, and explicitly modeling them results in simulations executing much slower than real time. This paper presents a hybrid simulation-queueing module that can be inserted into any simulation to accurately model I/O resource consumption and queueing delays without explicitly modeling each individual I/O process. This module is in use at LEXIS-NEXIS to day (LEXIS and NEXIS are registered trademarks of Reed-Elsevier Properties, Inc., and are used under license).