Processor Mechanisms for Software Shared Memory

  • Authors:
  • Nicholas P. Carter;William J. Dally;Whay Sing Lee;Stephen W. Keckler;Andrew Chang

  • Affiliations:
  • -;-;-;-;-

  • Venue:
  • ISHPC '00 Proceedings of the Third International Symposium on High Performance Computing
  • Year:
  • 2000

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Abstract

The M-Machine's combined hardware-software shared-memory system provides significantly lower remote memory latencies than software DSM systems while retaining the flexibility of software DSM. This system is based around four hardware mechanisms for shared memory: status bits on individual memory blocks, hardware translation of memory addresses to home processors, fast detection of remote accesses, and dedicated thread slots for shared-memory handlers. These mechanisms have been implemented on the MAP processor, and allow remote memory references to be completed in as little as 336 cycles at low hardware cost.