Summary

• Vector/SIMD offer fine-grain parallel processing, simple programming model
• Costly, suffer from Amdahl's law effects
• SMP Clusters -- low cost, scalable, flexible, high overhead, low efficiency
• Scalable SMP -- high cost, somewhat scalable, flexible, high overhead, low efficiency
• Multithreaded -- custom processors, hard to exploit parallelism
• Heterogeneous -- high performance, but difficult to use, usually highly specialized

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