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The rise of multi-core processors has shifted performance e orts towards parallel programs. However, single-threaded code, whether from legacy programs or ones difficult to parallelize, remains important. Proposed asymmetric multicore processors statically dedicate hardware to improve sequential performance, but at the cost of reduced parallel performance. However, several proposed mechanisms provide the best-of-both-worlds by combining multiple cores into a single, more powerful processor for sequential code. For example, Core Fusion merges multiple cores to pool caches and functional units, and Intel's Turbo Boost raises the clock speed of a core if the other cores on a chip are powered down.
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