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A microserver is a server class computer which is based on a system on a chip (SoC). The goal is to integrate most of the server motherboard functions onto a single microchip, except DRAM, boot FLASH and power circuits.〔"Dual function heat-spreading and performance of the IBM / Astron DOME 64-bit μServer demonstrator", R. Luijten, A. Doering and S. Paredes, ICICDT, May 2014, Austin, TX〕 Thus, the main chip contains more than only compute cores, caches, memory interfaces and PCI controllers. It typically also contains SATA, networking, serial port and boot FLASH interfaces on the same chip. This eliminates support chips (and therefore area, power and cost) at the board level. ==History== The term microserver started to appear around 2010 and is commonly misunderstood to imply low performance.〔“FAWN: A Fast Array of Wimpy Nodes”. D. Andersen et. al. Proc. 22nd ACM Symposium on Operating Systems Principles (SOSP 2009), Big Sky, MT. October 2009.〕 Microservers originate from the embedded market, where due to cost and space these types of SoCs appeared before they did in general purpose computing. Indeed, recent research indicates that emerging scale-out services and popular datacenter workloads (e.g., as in CloudSuite〔"The CloudSuite". http://parsa.epfl.ch/cloudsuite.〕) require a certain degree of single-thread performance (with out-of-order execution cores) which may be lower than those in conventional desktop processors but much higher than those in the embedded systems.〔"Clearing the Clouds". M. Ferdman et. al. Proc. 17th ACM International Conference on Architectural Support for Programming Languages and Operating Systems (ASPLOS), 2012.〕 A modern microserver typically features medium-high performance at high packaging densities, allowing very small compute node form factors. This can result in high energy efficiency (operations per Watt), typically better than that of highest performance processors.〔"Energy Efficient MicroServer based on a 12-core 1.8GHz 188K Coremark 28nm Bulk CMOS 64-bit SoC for Big-Data Applications with 159GB/s/liter Memory Bandwidth System Density.", R. Luijten, D. Pham, R. Clauberg, H. Nguyen, M. Cossale, M. Pandya, ISSCC 2015, Feb 2015, San Francisco〕 One of the early microservers is the 32-bit SheevaPlug. There are plenty of Consumer-Grade 32-bit microservers available, for instance the Banana Pi as seen on Comparison of single-board computers. Early 2015, even a 64-bit Consumer-Grade microserver is announced.〔(Allwinner Nobel64 is a 64-bit dev board )〕 Data-Center-Grade microservers need to be 64-bit and run server class operating systems such as RHEL or SUSE. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Microserver」の詳細全文を読む スポンサード リンク
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