Posts about Hardware

Stopwatch under the hood

In the previous post, we discussed DateTime. This structure can be used in situations when you don't need a good level of precision. If you want to do high-precision time measurements, you need a better tool because DateTime has a small resolution and a big latency. Also, time is tricky, you can create wonderful bugs if you don't understand how it works (see Falsehoods programmers believe about time and More falsehoods programmers believe about time).

In this post, we will briefly talk about the Stopwatch class:

  • Which kind of hardware timers could be a base for Stopwatch
  • High precision timestamp API on Windows and Linux
  • Latency and Resolution of Stopwatch in different environments
  • Common pitfalls: which kind of problems could we get trying to measure small time intervals

If you are not a .NET developer, you can also find a lot of useful information in this post: mainly we will discuss low-level details of high-resolution timestamping (probably your favorite language also uses the same API). As usual, you can also find useful links for further reading.

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