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An Implementation of User-level Distributed Shared Memory

An Implementation of User-level Distributed Shared Memory. Wei Zhang & Shu Liu. DSM: Shared Memory + Distributed Memory. Problems & Solutions. Cont. Design Overview. For a read. For a write. Implementation. Data structures: Page Table in each node Pageinfo in server

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An Implementation of User-level Distributed Shared Memory

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  1. An Implementation of User-level Distributed Shared Memory Wei Zhang & Shu Liu

  2. DSM: Shared Memory + Distributed Memory Final Report

  3. Problems & Solutions Final Report

  4. Cont. Final Report

  5. Design Overview Final Report

  6. For a read Final Report

  7. For a write Final Report

  8. Implementation • Data structures: • Page Table in each node • Pageinfo in server • Important system calls • mmap() • mprotect() • SIGSEGV signal: handle page fault • pthread: receive page fault request and send data Final Report

  9. Cont. • MPI: create a cluster and be responsible for communication • #include ”dsm.h”: a simple yet powerful API 2014/9/14 Final Report 9

  10. Cont. Include dsm header file Start dsm system Allocate shared memory Synchronize Free shared memory Exit Final Report

  11. Evaluation • Assumptions: • server congestion is not the bottleneck • network is reliable • Benchmarks: • Jacobi: partial differential equations: Ax=b • MM: parallel matrix multiply: C=AB • Scan: multi-iteration scan program • Focus: multi-iteration write program Final Report

  12. Cont. • Speedup Final Report

  13. Cont. • Page Fault 2014/9/14 Progress Report 13 Final Report

  14. Conclusion & Future work • Achieved what we claimed • Improvement: • Blocking Communication-> Non-blocking Communication • Other Memory Consistency Model (MRMW) • Decrease network communication

  15. Thank you! 2014/9/14 Final Report 15

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