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An adaptive cache coherence protocol specification for parallel input/output systems
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DOI：10.1109/TPDS.2004.1.png)
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Abstract
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Caching has been intensively used in memory and traditional file systems to improve system performance. However, the use of caching in parallel file systems and I/O libraries has been limited to I/O nodes to avoid cache coherence problems. In this paper, we specify an adaptive cache coherence protocol very suitable for parallel file systems and parallel I/O libraries. This model exploits the use of caching, both at processing and I/O nodes, providing performance increase mechanisms as aggressive prefetching and delayed-write techniques. The cache coherence problem is solved by using a dynamic scheme of cache coherence protocols with different sizes and shapes of granularity. The proposed model is very appropriate for parallel I/O interfaces, as MPI-IO. Performance results, obtained on an IBM SP2, are presented to demonstrate the advantages offered by the cache management methods proposed.
Keywords:
parallel file system
caching
cache coherence
protocol specification
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