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Extensive polling in shared-memory manycore systems can lead to contention,decreased throughput, and poor energy efficiency. Both lock implementations andthe general-purpose atomic operation, load-reserved/store-conditional (LRSC),cause polling due to serialization and retries. To alleviate this overhead, wepropose LRwait and SCwait, a synchronization pair that eliminates polling byallowing contending cores to sleep while waiting for previous cores to finishtheir atomic access. As a scalable implementation of LRwait, we presentColibri, a distributed and scalable approach to managing LRwait reservations.Through extensive benchmarking on an open-source RISC-V platform with 256cores, we demonstrate that Colibri outperforms current synchronizationapproaches for various concurrent algorithms with high and low contentionregarding throughput, fairness, and energy efficiency. With an area overhead ofonly 6%, Colibri outperforms LRSC-based implementations by a factor of 6.5x interms of throughput and 7.1x in terms of energy efficiency.

LRSCwait: Enabling Scalable and Efficient Synchronization in Manycore Systems through Polling-Free and Retry-Free Operation