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Lower and upper bounds on time for multiprocessor optimal schedules

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2 Author(s)
K. Kumar Jain ; Dept. of Comput. Sci. & Autom., Indian Inst. of Sci., Bangalore, India ; V. Rajaraman

The lower and upper bounds on the minimum time needed to process a given directed acyclic task graph for a given number of processors are derived. It is proved that the proposed lower bound on time is not only sharper than the previously known values but also easier to calculate. The upper bound on time, which is useful in determining the worst case behavior of a given task graph, is presented. The lower and upper bounds on the minimum number of processors required to process a given task graph in the minimum possible time are also derived. It is seen with a number of randomly generated dense task graphs that the lower and upper bounds we derive are equal, thus giving the optimal time for scheduling directed acyclic task graphs on a given set of processors

Published in:

IEEE Transactions on Parallel and Distributed Systems  (Volume:5 ,  Issue: 8 )