Compute Node Linux (CNL) is a runtime environment based on the Linux kernel for the Cray XT3, Cray XT4, Cray XT5, Cray XT6, Cray XE6 and Cray XK6 supercomputer systems based on SUSE Linux Enterprise Server.[1] [2] CNL forms part of the Cray Linux Environment. systems running CNL were ranked 3rd, 6th and 8th among the fastest supercomputers in the world.[3]