Cluster of supercomputers

• Questions:

  • What is the achievable efficiency?
  • What system characteristics limit performance?
  • What runtime tunings and application modifications would bring the best profit in terms of performance?

• 3D space decomposition within a supercomputer, 1D decomposition among supercomputers.

• Assumptions

  • Perfect load balancing through irregular data distributions
  • The cost of N processors each sending B bytes is the same as the cost of 1 processor sending N*B bytes

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