Basic HTML version of Foils prepared 17 November 98

Foil 67 Summary of Cache Coherence Approaches

From Master Foilset for HPC Achitecture Overview CPS615 Introduction to Computational Science -- Fall Semester 1998. by Geoffrey C. Fox


1 Machines like the SGI Origin 2000 have a distributed shared memory with a so called directory implementation (pioneered in DASH project at Stanford) of cache coherence
2 Machines like SGI Cray T3E are distributed memory but do have fast get and put so as to be able to access single variables stored on remote memories
  • This gives performance advantage of shared memory without the programming advantage but complex hardware of Origin 2000
3 Origin 2000 approach does not scale as well as Cray T3E and large Origin 2000 systems must use message passing to link 128 node coherent memory subsystems
4 Cray T3E offers a uniform (but not as good for small number of nodes) interface
5 Pure Message passing / distributed memory is natural web model

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