By Hermann Hellwagner, Alexander Reinefeld
ISBN-10: 3540470484
ISBN-13: 9783540470489
ISBN-10: 3540666966
ISBN-13: 9783540666967
Scalable Coherent Interface (SCI) is an leading edge interconnect commonplace (ANSI/IEEE Std 1596-1992) addressing the high-performance computing and networking area. This ebook describes intensive one particular program of SCI: its use as a high-speed interconnection community (often referred to as a procedure 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 platforms, and are heavily curious about a number of study tasks in this very important interconnect. This completely cross-reviewed cutting-edge survey covers the entire hardware/software spectrum of SCI clusters, from the key strategies of SCI, via SCI undefined, networking, and low-level software program concerns, a number of programming versions and environments, as much as instruments and alertness experiences.
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Additional info for SCI: Scalable Coherent Interface: Architecture and Software for High-Performance Compute Clusters
Example text
Up to 64 transactions can be outstanding per node. 2, packets (1) and (2), for an illustration of this handshake on a request subaction. , due to a full input queue). In the former case, the sender can discard the send packet from its output queue (where it is required to be held); in the latter case, the sender retransmits the packet. A consequence of this rejection/retry mechanism is that in-order delivery of packets cannot be guaranteed by the SCI hardware: a packet rejected by a busy queue can be overtaken by a later packet which happens to find space in the same queue.
Resp. ➂ Requ. Resp. (3) Request send (4) Request echo Local response subaction Responder Requ. Resp. Requester Requ. Resp. ➃ Agent Requ. Resp. Responder ➁ Requ. Resp. 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.
2 will describe the common solutions – attaching SCI to the I/O bus or to the memory bus – in more detail. Bus-like services. To complete the hardware DSM, SCI defines transactions to read, write, and lock memory locations, functionality well-known from computer buses. In addition, message passing and global time synchronization are supported, both as defined by the CSR Architecture; interrupts can be delivered remotely as well. Broadcast functionality is also defined. Transactions can be tagged with four different priorities.
SCI: Scalable Coherent Interface: Architecture and Software for High-Performance Compute Clusters by Hermann Hellwagner, Alexander Reinefeld
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