Anomalies in parallel branch-and-bound algorithms
نویسندگان
چکیده
منابع مشابه
Parallel Branch and Bound and Anomalies
In this paper we present a classification of parallel branch and bound algorithms and investigate the anomalies which can occur during the execution of such algorithms. We develop sufficient conditions to prevent deceleration anomalies from degrading the performance. Such conditions were already known for some synchronous cases. It turns out that these conditions can be generalized to arbitrary...
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The parallel execution of branch and bound algorithms can result in seemingly unreasonable speedups or slowdowns. Almost never the speedup is equal to the increase in computing power. For synchronous parallel branch and bound, these effects have been studied extensively. For asynchronousparallelizations, only little is known. In this paper, we derive sufficient conditions to guarantee that an a...
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1.1. INTRODUCTION In the beginning of the twenty-first century, large unsolved combinatorial optimization problems have been solved exactly. Two impressive cases should be mentioned. First are two instances of the Monde, Transfert) newspapers. This impressive media frenzy reflected the impact of the achievement, which was deemed of the same order of magnitude as the victory of IBMs parallel com...
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Four different initialization methods for parallel Branch-and-bound algorithms are described and compared with reference to several criteria. A formal analysis of their idle times and efficiency follows. It indicates that the efficiency of three methods depends on the branching factor of the search tree. Furthermore, the fourth method offers the best efficiency of the overall algorithm when a c...
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A genera! technique for solving a wide variety of search problems is the branch-and-bound (B&B) algorithm. We have adapted and extended B&B algorithms for parallel processing. Anomalies owing to parallelism may occur. -In this paper sufficient conditions to guarantee that parallelism will not degrade the performance are presented. Necessary conditions for allowi& parallelism to have a speedup g...
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ژورنال
عنوان ژورنال: Communications of the ACM
سال: 1984
ISSN: 0001-0782,1557-7317
DOI: 10.1145/358080.358103