V.Adve, S.Adve, Hill, & Vernon's study

Goals, methodology, conditions, and metrics

• HW directory schemes versus static SW schemes

• analytical method

  • high level program behavior model (independent of the CC scheme): access dynamics for different class of shared data;
    • Parameter examples:
      
    • Fdata = data references/memory accesses
    • Fx = x-class of shared data references/shared data references
  • low level model is derived from high level parameters (describes concrete CC scheme)
    • Parameter examples:
      
    • HW: Pr/sh = read misses/references to lines in shared state
    • SW: Pinv = invalidations/references

• low level parameters are inputs into the MVA model

• performance measure: processor efficiency:

  • average fraction of time each processor spends executing locally out of its cache