SCI: Scalable Coherent Interface: Architecture and Software by Hermann Hellwagner, Alexander Reinefeld

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By Hermann Hellwagner, Alexander Reinefeld

Scalable Coherent Interface (SCI) is an cutting edge interconnect general (ANSI/IEEE Std 1596-1992) addressing the high-performance computing and networking area. This booklet describes intensive one particular software of SCI: its use as a high-speed interconnection community (often referred to as a process zone community, SAN) for compute clusters equipped from commodity pc nodes. The editors and authors, coming from either academia and undefined, were instrumental within the SCI standardization technique, the advance and deployment of SCI adapter playing cards, switches, totally built-in clusters, and software program structures, and are heavily desirous about quite a few learn initiatives in this vital interconnect. This completely cross-reviewed state of the art survey covers the entire hardware/software spectrum of SCI clusters, from the key options of SCI, via SCI undefined, networking, and low-level software program concerns, numerous programming versions and environments, as much as instruments and alertness experiences.

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Additional resources for SCI: Scalable Coherent Interface: Architecture and Software for High-Performance Compute Clusters

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Some of the standards extending or supporting the base SCI standard are referred to here as well. 12 H. 1 Logical Layer The logical layer specifies transaction types and protocols, packet types and formats, packet encodings, the standard node interface structure, bandwidth and queue allocation protocols, error processing, addressing and initialization issues, and SCI-specific CSRs. Transactions. Transactions are split, consisting of a request and (for most transactions) of a response subaction. Correspondingly, the nodes involved are called the requester and the responder.

This explains the complexity of the coherence specification. Simulations of the specification (given by the C code) have greatly helped in designing and debugging the protocols. 2. The more advanced coherence protocol sets introduce optional optimizations for important sharing or access conditions. , one producer and one consumer share a data block; in this case, data may be transferred directly from the producer’s cache to the consumer’s cache, without manipulating the sharing list on each modification and 22 H.

This is a vital feature to avoid scalability impediments; that is, it makes signaling speed independent of the distance a transaction has to travel and avoids monopolizing network links. Transactions therefore have to be self-contained and are sent as packets, containing a transaction ID, addresses, commands, status, and data as needed. A consequence is that multiple transactions can be outstanding 1. The SCI Standard and Applications of SCI 9 per node. Transactions can thus be pumped into the network at a high rate, using the interconnect in a pipeline fashion.

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