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Distributed-directory scheme: scalable coherent interface

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4 Author(s)
James, D.V. ; Apple Comput., New York, NY, USA ; Laundrie, A.T. ; Gjessing, S. ; Sohi, G.S.

The scalable coherent interface (SCI), a local or extended computer backplane interface being defined by an IEEE standard project (P1596), is discussed. the interconnection is scalable, meaning that up to 64 K processor, memory, or I/O nodes can effectively interface to a shared SCI interconnection. The SCI sharing-list structures are described, and sharing-list addition and removal are examined. Optimizations being considered to improve the performance of large system configurations are discussed. Request combining, a useful feature of linked-list coherence, is described. SCI's optional extensions, including synchronization using a queued-on-lock bit, are considered.<>

Published in:

Computer  (Volume:23 ,  Issue: 6 )

Date of Publication:

June 1990

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