By Hermann Hellwagner, Alexander Reinefeld
Scalable Coherent Interface (SCI) is an leading edge interconnect typical (ANSI/IEEE Std 1596-1992) addressing the high-performance computing and networking area. This booklet describes intensive one particular program of SCI: its use as a high-speed interconnection community (often known as a process quarter community, SAN) for compute clusters outfitted from commodity laptop 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 occupied with quite a few learn tasks in this very important interconnect. This completely cross-reviewed state of the art survey covers the full hardware/software spectrum of SCI clusters, from the main innovations of SCI, via SCI undefined, networking, and low-level software program matters, quite a few programming versions 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
However, the adapter card hosts a programmable processor, which allows speciﬁc communication mechanisms to be implemented, among them abstractions akin to DSM . Chapter 2 describes Myrinet in more detail and investigates its performance by several communication benchmarks. Other cluster interconnects supporting high-bandwidth, low-latency message-passing communication include ParaStation  and ATOLL . , barrier synchronizations and global reduction operations .
Transactions with responses are read, write, and lock accesses to DSM, in various ﬂavors. Read transactions copy data from the responder to the requester, with 16, 64, or 256 bytes being transferred. In a 16-byte transaction, 1. The SCI Standard and Applications of SCI Local request subaction Requester ➀ Requ. Resp. (1) Request send (2) Request echo Remote request subaction Responder Requester Requ. Resp. Requ. Resp. Requester Agent Agent Requ. Resp. ➂ Requ. Resp. (3) Request send (4) Request echo Local response subaction Responder Requ.
As illustrated, a packet consists of a contiguous sequence of 16-bit symbols. The packet header normally comprises seven symbols (14 bytes) and the trailer (CRC code) one symbol (2 bytes). Symbol (16 bits) Target ID Flow control Command Source ID Time of death Transaction ID Address offset Header extension (0 or 16 bytes) Data (0, 16, 64, or 256 bytes) CRC code Fig. 4. Request send packet format (simpliﬁed) The ﬁrst symbol of the header contains the address of the destination node, target ID. Nodes receiving a packet on the incoming link inspect the target ID symbol to quickly determine whether to accept the packet (take it oﬀ the link) or to pass it on to the outgoing link.