By Hermann Hellwagner, Alexander Reinefeld
Scalable Coherent Interface (SCI) is an leading edge interconnect normal (ANSI/IEEE Std 1596-1992) addressing the high-performance computing and networking area. This ebook describes extensive one particular software of SCI: its use as a high-speed interconnection community (often known as a method region community, SAN) for compute clusters outfitted from commodity notebook nodes. The editors and authors, coming from either academia and undefined, were instrumental within the SCI standardization strategy, the improvement and deployment of SCI adapter playing cards, switches, totally built-in clusters, and software program platforms, and are heavily concerned with a variety of learn initiatives in this vital interconnect. This completely cross-reviewed state of the art survey covers the whole hardware/software spectrum of SCI clusters, from the most important innovations of SCI, via SCI undefined, networking, and low-level software program matters, a number of programming types and environments, as much as instruments and alertness experiences.
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Extra info for SCI: Scalable Coherent Interface: Architecture and Software for High-Performance Compute Clusters
As a system area network, was soon realized and leveraged by industry. This section introduces several of these “classical” applications of SCI and provides examples of commercial systems exploiting SCI technology. , SyncLink  and SerialPlus , are covered in Chapter 27. , networks of commodity workstations or PCs, are becoming ever more important as cost-eﬀective parallel and distributed computing facilities. An SCI system area network can provide high-performance communication capabilities for such a cluster.
A memory address to fetch data from. The optional header extension (16 bytes) is employed by certain cache coherency transactions only. Depending on the request type, the packet carries 0, 16, 64, or optionally, 256 bytes of data. The 16-bit CRC code consumes the ﬁnal symbol of the packet. The CRC polynomial and a parallel hardware implementation model are speciﬁed in the SCI standard so that CRC codes can be computed and checked at full link speeds. The ﬂow control information of the packet is excluded from the CRC calculation since it changes during the passage of the packet through the SCI network.
Remote response subaction Requ. Resp. 13 Responder Requ. Resp. Agent (6) Response echo (8) Response echo (5) Response send (7) Response send Requ. Resp. Fig. 2. Remote transaction phases Request Response readnn Header (16) Header (16) writenn Header (16) Data (nn = 16, 64, or 256) Header (16) lock Header (16) Data (16) Header (16) movenn Header (16) Data (nn = 0, 16, 64, or 256) eventnn Header (16) Data (nn = 0, 16, 64, or 256) Data (nn = 0, 16, 64, or 256) Data (16) Fig. 3. Transaction types (The numbers in parentheses denote the number of bytes of the packets.