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(.): fork-join queueing network, acyclic queueing network, task service, approximation, response time
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(.): An open fork-join queueing network is considered. An arriving job is
split to be serviced into two tasks. The tasks are serviced independently at multiple service-nodes. Each service-node is a queueing system with one server and infinite capacity queue. Service-nodes form a queueing network with an acyclic topology. Two tasks associated with the job synchronize at a join-node before they leave the network. Approximations for the mean time spent by a task in the join-node and the mean response time in the fork-join queueing network are derived by assuming that jobs arrive according to a Poisson process and task service times have an exponential distribution. The accuracy of these approximations is demonstrated by comparing approximate results to simulation results. These approximations can be applied to the analysis of queueing networks with relatively small steady-state workload. The results can be used for the performance analysis of multiprocessor systems and other modern distributed computing systems.
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