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Issue No.04 - July/August (2009 vol.29)
pp: 36-47
John Feehrer , Sun Microsystems
Paul Rotker , Sun Microsystems
Milton Shih , Sun Microsystems
Paul Gingras , Sun Microsystems
Peter Yakutis , Sun Microsystems
Stephen Phillips , Sun Microsystems
John Heath , University of Southern Maine
<p>CoHub, a coherency hub ASIC, provides a cost-effective way to extend a glueless two-node chip-multithreading system to a four-node system without changes to the processor. The four-node, 256-thread system achieves near-linear scaling of performance with thread count on transaction-processing workloads. Time-to-market pressure, 800-MHz operation, and a six-stage pipeline were among the constraints that shaped CoHub's design.</p>
chip multithreading, UltraSparc, cache coherency, multiprocessor interconnect, SpecCPU2006, SPEC, AppServer2004, hardware
John Feehrer, Paul Rotker, Milton Shih, Paul Gingras, Peter Yakutis, Stephen Phillips, John Heath, "Coherency Hub Design for Multisocket Sun Servers with CoolThreads Technology", IEEE Micro, vol.29, no. 4, pp. 36-47, July/August 2009, doi:10.1109/MM.2009.62
1. S. Phillips, "Victoria Falls: Scaling Highly-Threaded Processor Cores," presentation, Hot Chips 19, 2007; HC19.09HC19.09.01.pdf.
2. J. Feehrer et al., "Coherency Hub Design for Multi-Node Victoria Falls Systems," Hot Interconnects 16, 2008; .
3. J.L. Hennessy and D.A. Patterson Computer Architecture: A Quantitative Approach, 4th ed., Morgan Kaufmann, 2007.
4. "UltraSPARC IV Processor Architecture Overview," white paper, Sun Microsystems, Feb. 2004; us4_whitepaper.pdf.
5. "Low Pin Count Interface Specification," Intel, Aug. 2002; 25128901.pdf.
6. , "FB-DIMM Draft Specification: Architecture and Protocol," JEDEC Standard Proposal, JEDEC Solid Sate Technology Assoc., Mar. 2005.
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