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Issue No. 09 - September (2008 vol. 19)
ISSN: 1045-9219
pp: 1263-1279
Charles E. Leiserson , MIT, Cambridge
Wen-Jing Hsu , Nanyang Technological University, Singapore
Yuxiong He , Singapore MIT Alliance, Nanyang Technological University, Singapore
Multiprocessor scheduling in a shared multiprogramming environment can be structured in two levels, where a kernel-level job scheduler allots processors to jobs and a user-level thread scheduler maps the ready threads of a job onto the allotted processors. We present two provably-efficient two-level scheduling schemes called G-RAD and S-RAD respectively. Both schemes use the same job scheduler RAD for the processor allotments that ensures fair allocation under all levels of workload. In G-RAD, RAD is combined with a greedy thread scheduler suitable for centralized scheduling; in S-RAD, RAD is combined with a work-stealing thread scheduler more suitable for distributed settings. Both G-RAD and S-RAD are non-clairvoyant. Moreover, they provide effective control over the scheduling overhead and ensure efficient utilization of processors. We also analyze the competitiveness of both G-RAD and S-RAD with respect to an optimal clairvoyant scheduler. In terms of makespan, both schemes can achieve O(1)-competitiveness for any set of jobs with arbitrary release time. In terms of mean response time, both schemes are O(1)-competitive for arbitrary batched jobs. To the best of our knowledge, G-RAD and S-RAD are the first non-clairvoyant scheduling algorithms that guarantee provable efficiency, fairness and minimal overhead.
Scheduling and task partitioning, Multiple Data Stream Architectures (Multiprocessors), General
Charles E. Leiserson, Wen-Jing Hsu, Yuxiong He, "Provably Efficient Online Nonclairvoyant Adaptive Scheduling", IEEE Transactions on Parallel & Distributed Systems, vol. 19, no. , pp. 1263-1279, September 2008, doi:10.1109/TPDS.2008.39
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