Who Needs MPP Now?

• Those needing scalability to large numbers of processors for:
  • Memory size (MPP memory size scales with #processors)
    • SMP, PVP, and scalar workstation memory sizes technologically limited
      • Unless you have scalable dollars to pay (maybe)

    • For local (on-node) memory references, MPP aggregate memory access bandwidth scales with #procs

  • Compute speed (MPP compute speed scales with #procs)
    • Modern MPP processor interconnection networks scale up in aggregate bandwidth with #procs
      • xde Communication in scalable parallel programs not a bottleneck to compute speed scaling with #procs

• Grand Challenge problems, including those not deemed as such by HPCC

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