slide 26 of 35

Implementing Shared Memory

• There is more than one type...
  • Each PE has its own vars, others can access
  • All PEs see the same vars
• Access time a fn of address?
• Coherence?
  • It's up to the programmer (i.e., incoherent)
  • Various flavors of "weak" coherence
  • Fully coherent
• Atomicity?