A practical concurrent binary search tree

We propose a concurrent relaxed balance AVL tree algorithm that is fast, scales well, and tolerates contention. It is based on optimistic techniques adapted from software transactional memory, but takes advantage of specific knowledge of the the algorithm to reduce overheads and avoid unnecessary retries. We extend our algorithm with a fast linearizable clone operation, which can be used for consistent iteration of the tree. Experimental evidence shows that our algorithm outperforms a highly tuned concurrent skip list for many access patterns, with an average of 39% higher singlethreaded throughput and 32% higher multi-threaded throughput over a range of contention levels and operation mixes. Categories and Subject Descriptors D.3.3 [Programming Languages]: Language Constructs and Features ? Concurrent program

• Type: Conference
• Year: 2010
• Where: PPOPP
• Authors: Nathan Grasso Bronson, Jared Casper, Hassan Chafi, Kunle Olukotun
• Keywords: AVL Tree Algorithm, Concurrent Relaxed Balance, Concurrent Skip List, Parallel Computing, PPOPP 2010