Lower Bounds for On-Line Single-Machine Scheduling
نویسندگان
چکیده
The problem of scheduling jobs that arrive over time on a single machine is well-studied. We study the preemptive model and the model with restarts. We provide lower bounds for deterministic and randomized algorithms for several optimality criteria: weighted and unweighted total completion time, and weighted and unweighted total ow time. By using new techniques, we provide the rst lower bounds for several of these problems, and we signi cantly improve the bounds that were known. 2000 Mathematics Subject Classi cation: 68Q25, 68W20, 68W25 1998 ACM Computing Classi cation System: F.2.2
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