{"type":"ScholarlyArticle","title":"Evaluations of Hash Distributed A* in Optimal Sequence Alignment","authors":[{"name":"Yoshikazu Kobayashi","slug":"yoshikazu-kobayashi","given":"Yoshikazu","family":"Kobayashi","affiliation":""},{"name":"Akihiro Kishimoto","slug":"akihiro-kishimoto","given":"Akihiro","family":"Kishimoto","affiliation":""},{"name":"Osamu Watanabe","slug":"osamu-watanabe","given":"Osamu","family":"Watanabe","affiliation":""}],"abstract":"Hash Distributed A* (HDA*) is a parallel A* algorithm that is proven to be effective in optimal sequential planning with unit edge costs. HDA* leverages the Zobrist function to almost uniformly distribute and schedule work among processors. This paper evaluates the performance of HDA* in optimal sequence alignment. We observe that with a large number of CPU cores HDA* suffers from an increase of search overhead caused by reexpansions of states in the closed list due to nonuniform edge costs in this domain. We therefore present a new work distribution strategy limiting processors to distribute work, thus increasing the possibility of detecting such duplicate search effort. We evaluate the performance of this approach on a cluster of multi-core machines and show that the approach scales well up to 384 CPU cores.","doi":"10.5591/978-1-57735-516-8/IJCAI11-105","url":"https://ijcai.org/proceedings/2011/105","pdf":"https://ijcai.org/proceedings/2011/0105.pdf","markdown":"https://ijcai.org/proceedings/2011/105.md","bibtex":"https://ijcai.org/proceedings/2011/bibtex/105","volume":{"slug":"2011","title":"Proceedings of the Twenty-Second International Joint Conference on Artificial Intelligence","short_title":"IJCAI 2011","url":"https://ijcai.org/proceedings/2011/","year":2011,"location":"Barcelona, Catalonia, Spain","dates":"16–22 July 2011","editors":"Toby Walsh","isbn":"978-1-57735-512-0; 978-1-57735-513-7; 978-1-57735-514-4; 978-1-57735-515-1; 978-1-57735-516-8","publisher":"AAAI Press/International Joint Conferences on Artificial Intelligence","doi_prefix":""},"section":null,"track":"","number":105,"pages":{"first":584,"last":589},"keywords":[],"videos":[],"references":[],"license_note":"Copyright International Joint Conferences on Artificial Intelligence."}