Timing with WTIME/WTICK

Timing with WTIME/WTICK

• Overhead of timing
• Dealing with granularity of timer
  • timers are not continuous - MPI_Wtick
• MPI_WTIME_IS_GLOBAL
  • What to do if value is false
  • NTP algorithms, simpler expedients
• Cache/setup effects
• Sample timing harness
  • limitations of the harness

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