@inproceedings{5947,
abstract = {Graph algorithms applied in many applications, including social networks, communication networks, VLSI design, graphics, and several others, require dynamic modifications - addition and removal of vertices and/or edges - in the graph. This paper presents a novel concurrent non-blocking algorithm to implement a dynamic unbounded directed graph in a shared-memory machine. The addition and removal operations of vertices and edges are lock-free. For a finite sized graph, the lookup operations are wait-free. Most significant component of the presented algorithm is the reachability query in a concurrent graph. The reachability queries in our algorithm are obstruction-free and thus impose minimal additional synchronization cost over other operations. We prove that each of the data structure operations are linearizable. We extensively evaluate a sample C/C++ implementation of the algorithm through a number of micro-benchmarks. The experimental results show that the proposed algorithm scales well with the number of threads and on an average provides 5 to 7x performance improvement over a concurrent graph implementation using coarse-grained locking.},
author = {Chatterjee, Bapi and Peri, Sathya and Sa, Muktikanta and Singhal, Nandini},
booktitle = {ACM International Conference Proceeding Series},
isbn = {978-1-4503-6094-4 },
location = {Bangalore, India},
pages = {168--177},
publisher = {ACM},
title = {{A simple and practical concurrent non-blocking unbounded graph with linearizable reachability queries}},
doi = {10.1145/3288599.3288617},
year = {2019},
}