numactl is a command line tool for running processes with a specific NUMA policy. It is useful for setting policies for programs that cannot be modified and recompiled. Here are some simple examples of how to use numactl: numactl --cpubind=0 --membind=0,1 program Run the program on the CPUs of node 0 and only allocate memory from node 0 or 1. cpubind uses node numbers, not CPU numbers. On a system with multiple CPUs per node, this can differ. numactl --preferred=1 numactl --show Allocate memory preferable from node 1 and show the resulting state. numactl --interleave=all numbercruncher Run memory bandwidth-intensive number cruncher with memory interleaved over all available nodes. numactl --offset=1G --length=1G --membind=1 --file /dev/shm/A --touch Bind the second gigabyte in the tmpfs file /dev/shm/A to node 1. numactl --localalloc /dev/shm/file Reset the policy for the shared memory file /dev/shm/file. numactl --hardware Print an overview of the available nodes.