Measuring Time

• Keep track of detailed timing of each instruction's execution

  • highly dependent on code
  • hard to use with compilers
  • not enough control over code generation
  • interactions with caches/instruction-buffers

• Loops to implement delays

  • keep track of time in counters
  • keeps processor busy counting and not doing other useful things

• Real-time clock

  • sample at different points in the program
  • simple difference to measure time delay

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