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Foil 19 Some Major Hardware Architectures - MIMD

From CPS615-Lecture on Performance(end) and Computer Technologies(start) Delivered Lectures of CPS615 Basic Simulation Track for Computational Science -- 10 September 96. by Geoffrey C. Fox *
Secs 156.9
1 MIMD Distributed Memory
  • This is now best illustrated by a collection of computers on a network (i.e. a metacomputer)
2 MIMD with logically shared memory but usually physically distributed. The latter is sometimes called distributed shared memory.
  • In near future, ALL formal (closely coupled) MPP's will be distributed shared memory
  • Note all computers (e.g. current MIMD distributed memory IBM SP2) allow any node to get at any memory but this is done indirectly -- you send a message
  • In future "closely-coupled" machines, there will be built in hardware supporting the function that any node can directly address all memory of the system
  • This distributed shared memory architecture is currently of great interest to (a major challenge for) parallel compilers
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