Testing thread priority. How come in some cases low priority threads are faster?

Question

I\'m trying to test 2 threads, one with high, and the other with low priority.

According to my results sometimes the low priority thread is faster, how is this possible?

Answer 1

Thread priorities are not guaranteed to have any effect; this is mentioned in multiple places, including JDK javadocs. So assuming that on platform you are running on basically ignores levels, then it goes back to basic stastical probabilities: sometimes some threads seem to run faster than others, depending on how scheduler works and so on.

I don't think anyone really uses Java thread priorities for everything, given that their working (or lack thereof) is at best platform-dependent.