TY - JOUR
T1 - An O(n log n) unidirectional distributed algorithm for extrema finding in a circle
AU - Dolev, Danny
AU - Klawe, Maria
AU - Rodeh, Michael
PY - 1982/9
Y1 - 1982/9
N2 - In this paper we present algorithms, which given a circular arrangement of n uniquely numbered processes, determine the maximum number in a distributive manner. We begin with a simple unidirectional algorithm, in which the number of messages passed is bounded by 2 n log n + O(n). By making several improvements to the simple algorithm, we obtain a unidirectional algorithm in which the number of messages passed is bounded by 1.5nlogn + O(n). These algorithms disprove Hirschberg and Sinclair's conjecture that O(n2) is a lower bound on the number of messages passed in undirectional algorithms for this problem. At the end of the paper we indicate how our methods can be used to improve an algorithm due to Peterson, to obtain a unidirectional algorithm using at most 1.356nlogn + O(n) messages. This is the best bound so far on the number of messages passed in both the bidirectional and unidirectional cases.
AB - In this paper we present algorithms, which given a circular arrangement of n uniquely numbered processes, determine the maximum number in a distributive manner. We begin with a simple unidirectional algorithm, in which the number of messages passed is bounded by 2 n log n + O(n). By making several improvements to the simple algorithm, we obtain a unidirectional algorithm in which the number of messages passed is bounded by 1.5nlogn + O(n). These algorithms disprove Hirschberg and Sinclair's conjecture that O(n2) is a lower bound on the number of messages passed in undirectional algorithms for this problem. At the end of the paper we indicate how our methods can be used to improve an algorithm due to Peterson, to obtain a unidirectional algorithm using at most 1.356nlogn + O(n) messages. This is the best bound so far on the number of messages passed in both the bidirectional and unidirectional cases.
UR - http://www.scopus.com/inward/record.url?scp=0000138318&partnerID=8YFLogxK
U2 - 10.1016/0196-6774(82)90023-2
DO - 10.1016/0196-6774(82)90023-2
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AN - SCOPUS:0000138318
SN - 0196-6774
VL - 3
SP - 245
EP - 260
JO - Journal of Algorithms
JF - Journal of Algorithms
IS - 3
ER -