10.1. Introduction
The previous two chapters discussed models that show the effect of contention for hardware resources (e.g., processors, I/O devices, routers, and LAN segments) on the response time of requests to execute functions of an e-business site. Besides hardware resources, other resources, such as software resources (e.g.. threads of a software server, database locks, and semaphores), can add to the delay experienced by requests and transactions.
This chapter illustrates the effects of software contention through some examples. Performance models that deal with software contention may be based on approximate analytic queuing network models or on simulation techniques. We briefly describe here how these techniques can be used to model ...
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