We then run several benchmarks to evaluate the tickless kernel on our modest 236-node quad-node InfiniBand cluster. LANL’s Parallel Ocean Program (POP) code is known for its sensitivity to noise and has been a common target for many researchers who investigated the effects of OS noise on parallel applications [7, 14]. We also used POP in our test to be able to compare our results to the literature. We left the first CPU on each node as the OS core and used the remaining three CPUs for the application.