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Veljko Milutinovic, Fellow of the IEEE vm@etf.bg.ac.yu

A Solution for the Multiple Writer Problem in Shared Memory Multiprocessors: Anticipated Intention to Commit in Adaptive Environment Confidential!. Veljko Milutinovic, Fellow of the IEEE vm@etf.bg.ac.yu. The Best Method to Present Research Results. 1. Introduction 2. Problem Statement

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Veljko Milutinovic, Fellow of the IEEE vm@etf.bg.ac.yu

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  1. A Solution for theMultiple Writer Problem in Shared Memory Multiprocessors:Anticipated Intention to Commit in Adaptive EnvironmentConfidential! Veljko Milutinovic, Fellow of the IEEEvm@etf.bg.ac.yu

  2. The Best Method to Present Research Results • 1. Introduction • 2. Problem Statement • 3. Existing Solutions • 4. Essence of the Proposed Solution • 5. Conditions and Assumptions • 6. Details • 7. Modelling • 8. Analysis • 9. Conclusions • 10. References

  3. 1. Introduction

  4. 2. Problem Statement: MRMW

  5. 3. Existing Solutions • The BEST current MRMW solution comes from Stanford professor Kunle Olokotun: Two-Phase Commit • The BEST current TMS/SMT solution comes from Barcelona professorMateo Valero: Microsoft-Intel UPC

  6. 4. Essence of the Proposed Approach • Major improvements of our approach: a. Includes a timer b. Includes an anticipatory action (Intention to Commit can be executed before the moment when a process is actually ready to commit) c. Imlies the usage of SMT (Simultaneous Multi Threading), so the process can keep busy, while waiting for the commit activity to complete. • Monitors and adaptivity

  7. 5. Conditions and Assumptions • Conditions: a. Size of MCM unit b. Processors vs processes and SMT c. Worst case delays in SMP vs DSM • Assumptions: a. False sharing b. Add-on to a directory scheme c. System limits

  8. 6. Details • Intention to Commit a. Vector of starting MCM unit addresses b. Vector of shared data involved c. Timer activated • Counter Interrupt a. No formal conflict b. Yes formal conflict; no essential conflict c. Both formal and essential conflict • Adaptive Priorities • Adaptive Abort vs Resume • Adaptive SMT

  9. 7. Analysis • System Modelling, Performance Analysis, Complexity Analysis • M5 GeneralSimulators vs UPC MareNostrum • Microsoft vs Intel

  10. 8. Conclusion and References

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