Thursday, March 19, 2009

Time running backwards in Microsoft's Hyper-V

You would think that subsequent calls to System.nanoTime() would return ever increasing values. After all, time cannot run backwards. However, when you run a JVM on the Hyper-V virtualization platform, it turns out that time may actually run backwards.

Hence, if you use this timer to measure time differences, you need to account for negative differences. This was a problem that I had not accounted for in the Hulp Measuring package.

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