Latency and Throughput

• Latency (How long a round trip takes) (network, disk, cache)

  • Back of the Envelope Calculations
  • Read 1MB memory 250 microseconds
  • Read 1MB SSD 1,000 microseconds
  • Send 1MB over 1GBps network 10,000 microseconds
  • Read 1MB HDD 20,000 microseconds
  • Packet from CA → Netherlands → CA 150,000 microseconds

• Throughput (How much work a machine can perform in a given amount of time)

• Reduce bottlenecks by increasing the amount of work a server can do.

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