About cookies on this site Our websites require some cookies to function properly (required). In addition, other cookies may be used with your consent to analyze site usage, improve the user experience and for advertising. For more information, please review your options. By visiting our website, you agree to our processing of information as described in IBM’sprivacy statement. To provide a smooth navigation, your cookie preferences will be shared across the IBM web domains listed here.
Publication
ISCC 2004
Conference paper
Optimized external scheduling for fair service discrimination
Abstract
In Web services environments, classes of service are offered at different performance levels. Requests belonging to various service classes are to be handled differently in order to yield their expected corresponding performance level. We investigate a mechanism that provides this service discrimination by deploying an optimized external scheduler, as opposed to common mechanisms for prioritization and internal server scheduling. A measure of Service Performance Level (SPL) that combines target and achieved performance values is introduced. Our approach is based on simple Weighted Round-Robin (WRR) scheduling with dynamically adjustable weights that are computed by solving an integer resource allocation problem. We present experimental results, contrasting a few scheduling policies. Further, we provide an analytic queueing network model to approximate the behavior of the system, and show its effectiveness.