Various server mechanisms that provide QoS extensions, however, rely on external administrators to set the right parameter values for their desirable performance. Īs more business applications have become web enabled, the web server architecture has evolved to provide performance isolation, service differentiation, and QoS guarantees. Our approach is to provide the scheduler with information on the inter-process communication interconnections between tasks and to use this information to guarantee an end-to-latency to applications that is simply a function of the timing properties of the application and not its task structure. We present an integrated inter-process communication and scheduling scheme that can be used to minimize the end-to-end latency of multi-threaded applications. When applications are structured as a set of cooperating tasks the time required for data to progress from an input task to an output task is a function of the number of the tasks that handle the data and the deadlines of individual tasks. This paper addresses the problem of minimizing the end-to-end latency of applications that are structured as a set of cooperating (real-time) tasks. : The design of general purpose operating systems impose constraints on the way one can structure real-time applications.
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