DYNAMIC GRAPH ANALYSIS FOR LOAD BALANCING APPLICATIONS
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1 DYNAMIC GRAPH ANALYSIS FOR LOAD BALANCING APPLICATIONS
2 DYNAMIC GRAPH ANALYSIS FOR LOAD BALANCING APPLICATIONS by Belal Ahmad Ibraheem Nwiran Dr. Ali Shatnawi Thesis submitted in partial fulfillment of the requirements for the degree of M.Sc. in Computer Engineering At The Faculty of Graduate Studies Jordan University of Science and Technology August, 2009
3 DYNAMIC GRAPH ANALYSIS FOR LOAD BALANCING APPLICATIONS by Belal Ahmad Ibraheem Nwiran Signature of Author Committee Member Dr. Ali Shatnawi (Chairman) Dr. Raed Bani Hani (Member) Dr. Sameh Ghwanmeh (External Examiner) Signature and Date August, 2009
4 DEDICATION To My Parents, Wife, and my friend Mohammad i
5 ACKNOWLEDGMENTS To my supervisor, teachers, and the supervisory committee ii
6 TABLE OF CONTENTS Title DEDICATION ACKNOELEDGEMENTS TABLE OF CONTENTS LIST OF FIGURES LIST OF TABLES LIST OF APPENDICES ABSTRACT Chapter One: Introduction 1.1 Graph Theory Graph Definition Graph Theory Applications 1.2 Load Balancing Problem 1.3 Load Balancing Classification 1.4 Dynamic Load Balancing Classification 1.5 Example Systems NOW MOSIX Condor Sprite Chapter Two: Related Work 2.1 Load Balancing Algorithm for Heterogeneous Grid Systems 2.2 Dynamic Load-Balancing Using Genetic Algorithms Page i ii iii v ix xi xii iii
7 2.3 Dynamic Rate of Change Load Balancing (RoC-LB) Algorithm 2.4 Loadserver Algorithm 2.5 The Generalized Dimension Exchange Method 2.6 An Optimal Dynamic Load Balancing Algorithm 2.7 Clustering-Based Dynamic Load Balancing Algorithm 2.8 Parallel Sorting with Dynamic Redistribution 2.9 Symmetrically initiated adaptive algorithm 2.10 Flexible load sharing Chapter Three: Approach 3.1 Problem Statement 3.2 Algorithm Star Center Algorithm Algorithm Elements Chapter Four: Experiments and Results 4.1 Experiments with Static Loads Generation Experiments with static load generation and a fixed number of node Experiments with static load generation and different numbers of nodes 4.2 Experiments with Dynamic Loads Generation Experiments with dynamic load generation and a fixed number of node Experiments with dynamic load generation and different numbers of nodes Chapter Five: Conclusion References Appendix A Arabic Abstract iv
8 LIST OF FIGURES Figure Description Page 1. Graph example 3 2. The adjacency matrix of the graph shown in figure Casavant and Kuhl s Load Balancing Classification 7 4. Osman and Ammar s Dynamic Load Balancing Classification 9 5. Performance of Sender-Initiated vs. Receiver-Initiated algorithms Genetic Algorithm string example of scheduling sample Overview of a web cluster Simple system graph The main elements of the SCLB algorithm Low state algorithm of the Star Center algorithm High state algorithm of the Star Center algorithm Normal State algorithm of the Star Center algorithm The Load Balancer algorithm of the Star Center algorithm nodes Open Ring graph nodes Ring graph (4 4) Mesh graph (4 4) Torus graph Hypercube graph Average initial load distribution in all experiments in section SCLB algorithm relative performance for experiment The average difference between the processed load using the SCLB and HOLB algorithms by each node in experiment 1 60 v
9 22. SCLB algorithm relative performance for experiment The average difference between the processed load using the SCLB and HOLB algorithms by each node in experiment SCLB algorithm relative performance for experiment The average difference between the processed load using the SCLB and HOLB algorithms by each node in experiment SCLB algorithm relative performance for experiment The average difference between the processed load using the SCLB and HOLB algorithms by each node in experiment SCLB algorithm relative performance for experiment The average difference between the processed load using the SCLB and HOLB algorithms by each node in experiment SCLB algorithm relative performance for experiment The average difference between the processed load using the SCLB and HOLB algorithms by each node in experiment The execution time using the SCLB and HOLB algorithms for each graph in experiment The execution time using the SCLB and HOLB algorithms for each graph in experiment The execution time using the SCLB and HOLB algorithms for each graph in experiment The execution time using the SCLB and HOLB algorithms for each graph in experiment The execution time using the SCLB and HOLB algorithms for each graph in experiment The execution time using the SCLB and HOLB algorithms for each graph in experiment Loads applied using the uniform load generation policy with min = 0, max = 50, and α = vi
10 39. Loads applied using the fixed load generation policy with fl = Loads applied using the exponential load generation policy with beta = SCLB algorithm relative performance for experiment The average difference between the processed load using the SCLB and HOLB algorithms by each node in experiment SCLB algorithm relative performance for experiment The average difference between the processed load using the SCLB and HOLB algorithms by each node in experiment SCLB algorithm relative performance for experiment The average difference between the processed load using the SCLB and HOLB algorithms by each node in experiment SCLB algorithm relative performance for experiment The average difference between the processed load using the SCLB and HOLB algorithms by each node in experiment SCLB algorithm relative performance for experiment The average difference between the processed load using the SCLB and HOLB algorithms by each node in experiment SCLB algorithm relative performance for experiment The average difference between the processed load using the SCLB and HOLB algorithms by each node in experiment The execution time using the SCLB and HOLB algorithms for each graph in experiment The execution time using the SCLB and HOLB algorithms for each graph in experiment The execution time using the SCLB and HOLB algorithms for each graph in experiment The execution time using the SCLB and HOLB algorithms for each graph in experiment vii
11 57. The execution time using the SCLB and HOLB algorithms for each graph in experiment The execution time using the SCLB and HOLB algorithms for each graph in experiment viii
12 LIST OF TABLES Table Description Page 1. Adjacency list of the graph shown in figure Local loads V.s. time units of the system graph shown in figure 8 3. The average initial load applied to each node in a simulated graph in each experiment (round) Graph characteristics for experiment Results of experiment Graph characteristics for experiment Results of experiment Graph characteristics for experiment Results of experiment Graph characteristics for experiment Results of experiment Graph characteristics for experiment Results of experiment Graph characteristics for experiment Results of experiment Results of experiment Results of experiment Results of experiment Results of experiment Results of experiment Results of experiment ix
13 22. The average load processed by each node in a simulated graph in each round 23. Load generation policies used in the experiments conducted in section Graph characteristics of experiment The results of experiment Graph characteristics of experiment The results of experiment Graph characteristics of experiment The results of experiment Graph characteristics of experiment The results of experiment Graph characteristics of experiment The results of experiment Graph characteristics of experiment The results of experiment Results of experiment Results of experiment Results of experiment Results of experiment Results of experiment Results of experiment x
14 LIST OF APPENDICES Appendix Description Page A. Graph algorithms used in the study 103 xi
15 ABSTRACT DYNAMIC GRAPH ANALYSIS FOR LOAD BALANCING APPLICATIONS by Belal Ahmad Ibraheem Nwiran This research investigates dynamic graphs for load balancing applications. It suggests a new distributed dynamic load balancing algorithm. This algorithm depends on exchanging messages between the nodes of a network of processing elements (i.e. network of workstations, network routers, processors in multi-processor architectures etc.) to transfer loads (to be alternatively called time units) and load-requests. Each node takes its decisions individually depending on its state and the messages it receives. The objective of this algorithm is to optimize some performance criteria such as the total response time. In an application that consists of tasks, the process can be thought of as load balancing by migrating tasks from a loaded node to a less loaded one. xii
16 21. T.L. Casavant, J.G. Kuhl. A taxonomy of scheduling in general-purpose distributed computing systems. IEEE Transactions on Software Engineering Feb 1988; 14(2): Michael Chau, Hsinchun Chen. Comparison of Three Vertical Search Spiders. IEEE Computer May 2003; 36(5): Wikipedia, Graph Theory, November, March, A. Barak, O. Laden, and Y. Yarom. The NOW Mosix and its Preemptive Process Migration Scheme. Bull. IEEE Technical Committee on Operating Systems and Application Environments 1995; 7(2): M. Litzkow, M. Livny and M. Mutka. Condor A Hunter of Idle Workstations. The 8 th International Conference on Distributed Computing Systems; F. Douglis and J. Ousterhout. Transparent Process Migration Design Alternatives and the Sprite Implementation. Software Practice and Experience Aug 1991; 21(8): Niranjan G. Shivaratri, Phillip Krueger, Mukesh Singhal. Load Distributing for Locally Distributed Systems. Computer Dec 1992; 25(12): C.-Z. Xu, B. Monien, R. L uling and F. C. M. Lau. Nearest neighbor algorithms for load balancing in parallel computers. Concurrency: Pract. Exp. 1995; 7(7): A. Grama, A. Gupta, G. Karypis, and V. Kumar. Introduction to Parallel Computing. 2 nd ed. Addison Wesley; J. Watts and S. Taylor. A Practical Approach to Dynamic Load Balancing [dissertation]. Syracuse University; Michael J. Litzkow. Remote unix - turning idle workstations into cycle servers. Proceedings of Summer USENIX Conference; F. Magoules, J. Pan, K. Tan, and A. Kumar. Introduction to Grid Computing. CRC;
17 Appendix A This appendix describes the graph algorithms that we used in our study. 1. Transitive Closure The transitive closure of a binary relation R is a relation R* defined as follows: x R* y if and only if there is a sequence: x 0 = x, x 1, x 2,, x n = y, where n > 0 and x 0 R x 1, x 1 R x 2,, x n-1 R x n. A binary relation can be represented by a directed graph. Suppose that G is the directed graph represented by a relation R. The directed graph G* representing the transitive closure R* of R is called the transitive closure of G. Reachability matrix of G is a matrix whose elements represent the reachability between two vertices v i and v j. v i is reachable to v j if there is a sequence of directed edges between them. The adjacency matrix of G* is the same as the reachability matrix of G. The following algorithm is developed by Warshall [16] to find the transitive closure of a graph G: Let M be the adjacency matrix of G for( i = 1; i < n; i++) { for (j = 1; j < n; j++) { if (M[i][j] == 1) { for (k = 1; k < n; k++) { M[j][k] = M[j][k] M[i][k]; } } } } where n is the order of the graph G. 103
18 2. Dijkstra s algorithm The Dijkstra s algorithm [13] is used to find the shortest path from a specified vertex to all other vertices in a graph. The following assumptions and notations will be used in algorithm: 1. Let G = (V, E) be the graph in which the algorithm will be applied on. It is assumed that all lengths are not negative. 2. u is the vertex from which the shortest path to all other vertices will be found. 3. D(v) is the distance between u and v. 4. N` is a subset of V that contains all the vertices {v} which the shortest path between u and v is definitely known. The following pseudo code is the Dijkstra s algorithm. Initialization: N` = {u}; foreach v in V { if v is adjacent to u { D(v) = d(u, v); Else D(v) = ; } } do { find w V - N` such that D(w) is minimum; add w to N`; foreach v V - N` that is adjacent to w { D(v) = min(d(v), D(w) + d(w, v)); } } while(n` V); 104
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