CPU execution time in Java

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  1. System.currentTimeMillis() will only ever measure wall-clock time, never CPU time.
  2. If you need wall-clock time, then System.nanoTime() is often more precise (and never worse) than currentTimeMillis().
  3. ThreadMXBean.getThreadCPUTime() can help you find out how much CPU time a given thread has used. Use ManagementFactory.getThreadMXBean() to get a ThreadMXBean and Thread.getId() to find the id of the thread you’re interested in. Note that this method need not be supported on every JVM!

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