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The number of on-chip cores of modern Chip Multi-Processors (CMPs) is growing fast with technology scaling. However, it remains a big challenge to efficiently support cache coherence for large scale CMPs. The conventional snoopy and directory coherence protocols cannot be smoothly scaled to many-core or thousand-core processors. Snoopy protocols introduce large power overhead due to enormous amount of cache tag probing triggered by broadcast. Directory proto-cols introduce performance penalty due to indirection, and large storage overhead due to storing directories.
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