Abstract: According to one embodiment, a processor includes an execution pipeline for executing a plurality of threads, including a first thread and a second thread. The processor further includes a multi-thread controller (MTC) coupled to the execution pipeline to determine whether to switch threads between the first and second thread based on a thread switch policy that is selected from a list of thread switch policies based on unfairness levels of the first and second thread, and in response to determining to switch threads, to switch from executing the first thread to executing the second thread.