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1995
IEEE

Software Cache Coherence for Large Scale Multiprocessors

10 years 2 months ago
Software Cache Coherence for Large Scale Multiprocessors
Shared memory is an appealing abstraction for parallel programming. It must be implemented with caches in order toperform well, however, and caches require a coherence mechanism to ensure that processors reference current data. Hardware coherence mechanisms for large-scale machines are complex and costly, but existing software mechanisms for message-passing machines have not provided a performance-competitive solution. We claim that an intermediate hardware option—memory-mappednetwork interfaces that support a global physical address space—can provide most of the performance benefits of hardware cache coherence. We present a software coherence protocol that runs on this class of machines and greatly narrows the performance gap between hardware and software coherence. We compare the performance of the protocol to that of existing software and hardware alternatives and evaluate the tradeoffs among various cache-write policies. We also observe that simple program changes can greatly...
Leonidas I. Kontothanassis, Michael L. Scott
Added 26 Aug 2010
Updated 26 Aug 2010
Type Conference
Year 1995
Where HPCA
Authors Leonidas I. Kontothanassis, Michael L. Scott
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