Performance Issues - Cache &Bandwidth

• Performance instability

  • Small changes in the architecture may cause dramatic changes in delivered performance.

• Latency tolerant and bandwidth parsimonious algorithms and software are critical

  • Sometimes this means recompute rather than store/load

• Need to help the compiler

• Have a hard time today getting performance

  • Only going to get harder

• Level 3 BLAS as a starting point

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