Java Timing Services

• Standard timing services are

  • long System.currentTimeMillis()
  • Thread.sleep(long millis)
  • Thread.sleep(long millis, int nanos)

• Problems with this

  • milliseconds are rather course for timing fast networks
  • sleep is a request to delay by at least amount given, not a guarantee
    • Actual gap may be much longer
    • Precision can vary depending on whether rescheduling the JVM is involved

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