1 7 th IEEE International Symposium on Cluster Computing and the Grid Welcome to the TCSC Doctoral Symposium

Challenges of Research in Scalable Systems Dr. Rajkumar Buyya Grid Computing and Distributed Systems (GRIDS) Laboratory Dept. of Computer Science and Software Engineering The University of Melbourne, Australia Gridbus Sponsors

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What are Scalable Systems? Wikipedia Definition: A scalable system is one that can easily be altered to accommodate changes in the number of users, resources and computing entities affected to it. Scalability can be measured in three different dimensions: Load scalability A distributed system should make it easy for us to expand and contract its resource pool to accommodate heavier or lighter loads. Geographic scalability A geographically scalable system is one that maintains its usefulness and usability, regardless of how far apart its users or resources are. Administrative scalability No matter how many different organizations need to share a single distributed system, it should still be easy to use and manage. Some loss of performance may occur in a system that allows itself to scale in one or more of these dimensions.

Scalable Systems: Centralised -> Decentralised Scalable Systems Loosely Coupled/Distributed SystemsTightly Coupled/Single Systems PC/WorkstationSMP/NUMAVectorMainframe GridsClustersWebPeer-to-Peer (multiple systems) Centralised Decentralised Control and Management Vertical ScaleHorizontal Scale …

Scalability at Various Levels Application Level Programming Platform Middleware Fabric

2100 Personal DeviceSMPs or SuperComputers Local Cluster Global Grid S E R V I C E S + P E R F O R M A N C E Inter Planet Grid Individual Group Department Campus State National Globe Inter Planet Universe Administrative Barriers Enterprise Cluster/Grid Computing is Scaling: Towards Inter-Planetary Level

Challenges of Horizontally Scalable Systems such as Grids Security Resource Allocation & Scheduling Data locality Network Management System Management Resource Discovery Uniform Access Computational Economy Application Construction

Self-managed and Self-regulated systems. Complexity present in Grid systems is similar to one present in human economies.

How do you Evaluate Scalable Systems Analytical Modelling Simulation Emulation Experimental Testbed Shared Repeatability Problem Dedicated E.g., Grid 5000 Testbed for CS Research (ref. CCGrid 07 Keynote) Which of these approaches are accessible to young researchers from? Developed, Developing, and Under developed countries?

Frank Slide

What Else TCSC Can do For you? Organize Doctoral Symposium again? Offer Travel Funds? Help Connect with International Researchers? Gain access to their tools/testbeds Organize International Competitions Develop Resource Centre for Young Researchers…