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A more Pragmatic Implementation of the Lock-free, Ordered...
Jesper Larsson Träff, Manuel Pöter · 2020-10-30 · via cs.DC updates on arXiv.org

The lock-free, ordered, linked list is an important, standard example of a concurrent data structure. An obvious, practical drawback of textbook implementations is that failed compare-and-swap (CAS) operations lead to retraversal of the entire list (retries), which is particularly harmful for such a linear-time data structure. We alleviate this drawback by first observing that failed CAS operations under some conditions do not require a full retry, and second by maintaining approximate backwards pointers that are used to find a closer starting position in the list for operation retry. Experiments with both a worst-case deterministic benchmark, and a standard, randomized, mixed-operation throughput benchmark on three shared-memory systems (Intel Xeon, AMD EPYC, SPARC-T5) show practical improvements ranging from significant, to dramatic, several orders of magnitude.