File placement and process assignment due to resource sharing in a distributed system
WSC '85 Proceedings of the 17th conference on Winter simulation
Modelling parallel access to shared resources in a distributed file system using queueing networks
Journal of Systems and Software
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This paper presents a new approach to estimating serialization delays in computer systems. An analytic model is introduced to describe synchronization of accesses to shared resources. The model parameters are estimated from the values of measurable quantities. The probabilities that a shared resource is locked, thereby causing other processes to wait for the resource to be accessible, are calculated, under certain assumptions, as functions of the probabilities of access and of the number of active transactions. The service times of lock servers are calculated as functions of the loads on all service centers. Performance measures applicable to the evaluation of computer systems are introduced and evaluated. An example involving a distributed file system and measurement data collected in a small business installation is given to compare performance measures provided by the simulation and analytic models.