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The IBM [[Blue Gene]] supercomputer uses the [[CNK operating system]] on the compute nodes, but uses a modified [[Linux]]-based kernel called INK (for I/O Node Kernel) on the I/O nodes.<ref name=EuroPar2004>''Euro-Par 2004 Parallel Processing: 10th International Euro-Par Conference'' 2004, by Marco Danelutto, Marco Vanneschi and Domenico Laforenza ISBN 3540229248 pages 835</ref><ref name=EuroPar2006 >''Euro-Par 2006 Parallel Processing: 12th International Euro-Par Conference'', 2006, by Wolfgang E. Nagel, Wolfgang V. Walter and Wolfgang Lehner ISBN 3540377832 page </ref> CNK is a [[Lightweight Kernel Operating System|lightweight kernel]] that runs on each node and supports a single application running for a single user on that node. For the sake of efficient operation, the design of CNK was kept simple and minimal, with physical memory being statically mapped and the CNK neither needing nor providing scheduling or context switching.<ref name=EuroPar2004 /> CNK does not even implement [[Input/output|file I/O]] on the compute node, but delegates that to dedicated I/O nodes.<ref name=EuroPar2006 /> However, given that on the Blue Gene multiple compute nodes share a single I/O node, the I/O node operating system does require multi-tasking, hence the selection of the Linux-based operating system.<ref name=EuroPar2004/><ref name=EuroPar2006/>
A number of modern supercomputers such as the [[Tianhe-I]] use the [[open source]] [[Simple Linux Utility for Resource Management|SLURM]] job scheduler which arbitrates contention for resources across the system. SLURM is Linux based and is quite scalable and can manage thousands of nodes in a computer cluster with a sustain throughput of over 100,000 jobs per hour.
==See also==
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