Willow: A Scalable Shared Memory Multiprocessor

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Willow: A Scalable Shared Memory Multiprocessor
We are currently developing Willow, a shared-memory multiprocessor whose design provides system capacity and performance capable of supporting over a thousand commercial microprocessors. Most recently, we have focused our attention on the design of a sixty-four processor prototype that tests most of our ideas about scalability. The design of such a multiprocessor poses a number of challenges to the computer architect. In this paper we describe the factors that traditionally have limited the scalability of shared-memory systems. These include: enforcing sequential consistency, ine cient synchronization, memory latency and bandwidth limitations, bus memory contention, the necessity to enforce inclusion on lower-level caches, and limited I/O bandwidth. We then describe how the Willow architecture addresses each of these issues. Finally, we present data that evaluates the e ect of the major architectural innovations in Willow on the performance of several parallel applications. These inno...
John K. Bennett, Sandhya Dwarkadas, Jay A. Greenwo
Added 10 Aug 2010
Updated 10 Aug 2010
Type Conference
Year 1992
Where SC
Authors John K. Bennett, Sandhya Dwarkadas, Jay A. Greenwood, Evan Speight
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