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• W2185655604 abstract "Concurrency control on B + trees is primarily achieved with latches, but serialization and contention can hinder scalability. As core counts on current processors increase, it is imperative to develop scalable latch-free techniques for concurrency control. We present PALM, a novel technique for performing multiple concurrent queries on in-memory B + trees. PALM is based on the Bulk Synchronous Parallel model, which guarantees freedom from deadlocks and race conditions. Input queries are grouped and processed in atomic batches , and work proceeds in stages that preclude contention. Transitions between stages are accomplished with scalable point-to-point communication. PALM exploits data-and thread-level parallelism on modern many-core architectures, and performs 40M 1 updates/second on trees with 128M keys, and 128M updates/second on trees with 512K keys on the latest CPU architectures. Our throughput is 2.3X--19X that of state-of-the-art concurrent update algorithms on in-memory B + trees. PALM obtains close to peak throughput at very low response times of less than 350μs, even for large trees. We also evaluate PALM on the Intel ® Many Integrated Core (Intel ® MIC) architecture, and demonstrate a speedup of 1.5--2.1X for out-of-cache tree sizes on an Intel ® Knights Ferry over a pair of Intel ® Xeon ® processors DP X5680 (Westmere-EP) in a dual-socket configuration." @default.
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• W2185655604 date "2011-08-01" @default.
• W2185655604 modified "2023-09-27" @default.
• W2185655604 title "PALM" @default.
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• W2185655604 doi "https://doi.org/10.14778/3402707.3402719" @default.
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