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An architecture of a hosting system is presented, where a number of servers are used to provide different types of web services to paying customers. There are charges for running jobs and penalties for failing to meet agreed QualityofService requirements. The objective is to maximize the total average revenue per unit time. Dynamic policies for making(More)
New methods are presented for parallel simulation of discrete event systems that, when applicable, can usefully employ a number of processors much larger than the number of objects in the system being simulated, Abandoning the distributed event list approach, the simulation problem is posed using recurrence relations. We bring three algorithmic ideas to(More)
Corrected sinus node recovery time (CSNRT) and atrioventricular node effective refractory period are longer in nonsedated adults than in sedated children at cardiac catheterization. We attempted to ascertain the relative contributions of age and catheterization sedation on these differences by studying adult beagles and beagle puppies previously(More)
We examine a system where the servers in a cluster may be switched dynamically and preemptively from one kind of work to another. The demand consists of M job types joining separate queues, with different arrival and service characteristics, and also different relative importance represented by appropriate holding costs. The switching of a server from queue(More)
Chakka, R. and I. Mitrani, Heterogeneous multiprocessor systems with breakdowns: A model of a system with N parallel processors subject to occasional interruptions of service, and a common unbounded queue fed by a Poisson arrival stream, is analyzed in the steady state. The service, breakdown and repair characteristics may vary from processor to processor.(More)