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Accessing Data on SGI Altix: An Experience with Reality

The SGI Altix system architecture allows to support very large ccNUMA shared memory systems. Nevertheless, the system layout sets boundaries to the sustained memory performance which can only be avoided by selecting the “right” data access strategies. The paper presents the results of cache and memory performance studies on SGI Altix 350. It demonstrates limitations and benefits of the system and the Intel Itanium 2 processor underneath.