Abstract: A computer implemented method, apparatus, and computer program product for optimizing a non-uniform memory access system. Each thread in a set of threads is affinitized to a processor in a set of processors at different times to form a temporarily affinitized thread, wherein a single temporarily affinitized thread is present. The set of threads execute on the set of processors to perform one or more tasks each time the temporarily affinitized thread is formed. Information is collected about memory accesses by the temporarily affinitized thread. Based on the collected information about the memory accesses, at least one thread in the set of threads is permanently affinitized to a processor in the set of processors.