Page Size

• Old - Page size fixed, New -choose page size

• How do we pick the right page size? Tradeoffs:

  • Fragmentation
  • Table size
  • Minimize I/O
    • transfer small (.1ms), latency + seek time large (10ms)
  • Locality
    • small finer resolution, but more faults
      • ex: 200K process (1/2 used), 1 fault / 200k, 100K faults/1 byte

• Historical trend towards larger page sizes

  • CPU, mem faster proportionally than disks

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