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Dan Higgins

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Previous notions of limited scalability of Linux were abruptly changed last year by the introduction of the SGI Altix server, which scaled up to 64 processors within a single system image (SSI). Today, large-scale Linux servers with hundreds of processors are being deployed by a variety of businesses, universities, research centers, and governments around the world. NASA Ames Research Center, for example, continues to push the limits even further with their 512-processor system running a single instance of the Linux kernel. This article examines the challenges in enabling large numbers of processors to work efficiently together to better support Linux system configurations for High- Performance Computing (HPC) environments. We will explain what scaling is, the importance of good hardware design, and the kernel changes that make scaling Linux on systems up to 256 pr... (more)