1. On-line machine covering on two machines with local migration
- Author
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Chen, Xufeng and Qin, Sen
- Subjects
- *
MACHINE theory , *PROBLEM solving , *ALGORITHMS , *MATHEMATICAL analysis , *NUMERICAL analysis , *MECHANICAL loads , *SCHEDULING - Abstract
Abstract: We study an on-line machine covering problem, in which jobs arrive one by one and their processing times are known upon their arrival, and jobs are allowed to migrate between machines when a new job is added in the system. However, the total processing time of migration induced by an incoming job is bounded by a constant factor times the processing time of the incoming job. The objective is to maximize the minimum machine load. In this paper, we present an on-line algorithm with competitive ratio 6/5 for the two identical machines case with . Moreover, the presented on-line algorithm is only a local migration, that is, when one job is assigned to machine , only the jobs on machine are allowed to migrate. We also show that the provided algorithm is a best possible on-line algorithm in the sense of local migration. [Copyright &y& Elsevier]
- Published
- 2011
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