Hi, I finally found the option for 'cluster-on-die' in BIOS, which sets two NUMA domains per CPU. On JLSE haswell nodes, it's going to be four NUMA domains. node distances: node 0 1 2 3 0: 10 21 31 31 1: 21 10 31 31 2: 31 31 10 21 3: 31 31 21 10 Ron and Andrew in the CESAR group are interested in comparing the cluster-on die performance with regular performance on their codes I guess possibly other folks are interested in running in this mode. - kaz