/Timer

Explore ways to time function calls in a high precision manner

Primary LanguageC++

Timer

Timing function calls in a high precision manner

  1. clock_gettime()

  • easy to use

  • supporting clocks

    • CLOCK_REALTIME

      System-wide realtime clock. Setting this clock requires appropriate privileges.

    • CLOCK_MONOTONIC

      Clock that cannot be set and represents monotonic time since some unspecified starting point.

    • CLOCK_PROCESS_CPUTIME_ID

      High-resolution per-process timer from the CPU.

    • CLOCK_THREAD_CPUTIME_ID

      Thread-specific CPU-time clock.

  • overhead: 0.1ms~0.2ms

  1. rdtscp
  • more accurate when working on the single process
  • overhead: less than 0.1ms