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One important way in which multiprocessors differ from uniprocessors is in the need to provide programmers the ability to synchronize concurrent access to memory. Transactional memory was proposed as a way of improving throughput especially when the rate of synchronization conflict is low. This paper explores power implications of transactional memory on standard and synthetic benchmarks. They propose a new "Serial execution" mode that lowers energy consumption during high contention periods by reducing transaction throughput. They conclude that transactional models are a promising approach to low-power synchronization, and serial execution strengthens the energy advantage, but that further work is needed to fully understand how transactions compare to locks at high levels of contention.

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Format:PDFSize:86 KB
Date:Jan 2008
Pages:7

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