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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. As of November 2011 [update] systems running CNL were ranked 3rd, 6th and 8th among the fastest supercomputers in the world. [3]