Optimal Load Balancing in Distributed Computer Systems

An important consideration in improving the performance of a distributed computer system is the balancing of the load between the host computers. Load balancing may be either static or dynamic; static balancing strategies are generally based on information about the system's average behavior rather than its actual current state, while dynamic strategies react to the current state when making transfer decisions. Although it is often conjectured that dynamic load balancing outperforms static, careful investigation shows that this view is not always valid. Recent research on the problem of optimal static load balancing is clearly and intuitively presented, with coverage of distributed computer system models, problem formulation in load balancing, and effective algorithms for implementing optimization. Providing a thorough understanding of both static and dynamic strategies, this book will be of interest to all researchers and practitioners working to optimize performance in distributed computer systems.

Contenu
1 Single Channel and Star Network Configurations.- 1.1 Introduction.- 1.2 Load Balancing in the Single Job Class Environment.- 1.3 Load Balancing in the Multi-class Job Environment.- 2 Overall vs. Individual Optimum.- 2.1 Introduction.- 2.2 Single Channel Communications Networks.- 2.3 Star Network Configurations.- 2.4 Multiclass Single Channel Networks.- 3 Tree Hierarchy Network Configurations.- 3.1 Introduction.- 3.2 Model Description and Problem Formulation.- 3.3 Optimal Load Balancing.- 3.4 Decomposability.- 3.5 Proposed Algorithm.- 3.6 Comparison of Algorithm Performance.- 3.7 Link Communication Time and Node Processing Time.- 3.8 Conclusion.- 4 Star Network with Two-way Traffic.- 4.1 Introduction.- 4.2 Model Description and Problem Formulation.- 4.3 Necessary and Sufficient Conditions.- 4.4 Proposed Algorithm.- 4.5 Parametric Analysis.- 4.6 A Numerical Example.- 4.7 Discussion.- 4.8 Conclusion.- 5 Tree Network with Two-way Traffic.- 5.1 Introduction.- 5.2 Model Description and Problem Formulation.- 5.3 Necessary and Sufficient Conditions.- 5.4 Decomposition.- 5.5 Proposed Algorithm.- 5.6 Comparison of Algorithm Performance.- 5.7 Conclusion.- 6 Uniqueness.- 6.1 Introduction.- 6.2 Description of the Model.- 6.3 The Overall Optimal Solution.- 6.4 The Individually Optimal Solution.- 6.5 Numerical Examples.- 6.6 Concluding Remarks.- 7 A Survey of Dynamic Load Balancing.- 8 Static vs. Dynamic.- 8.1 System Model.- 8.2 Static and Dynamic.- 8.3 Simulation Results.- 8.4 Discussion.