05970228

j

05970228 Barbosa, Jorge G. Moreira, Belmiro Dynamic scheduling of a batch of parallel task jobs on heterogeneous clusters. Parallel Comput. 37, No. 8, 428-438 (2011). 2011 Elsevier (North Holland), Amsterdam EN parallel task scheduling list scheduling image data multiple DAG non-deterministic job arrival

doi:10.1016/j.parco.2010.12.004

Summary: This paper addresses the problem of minimizing the scheduling length (make-span) of a batch of jobs with different arrival times. A job is described by a direct acyclic graph (DAG) of parallel tasks. The paper proposes a dynamic scheduling method that adapts the schedule when new jobs are submitted and that may change the processors assigned to a job during its execution. The scheduling method is divided into a scheduling strategy and a scheduling algorithm. We also propose an adaptation of the Heterogeneous Earliest-Finish-Time (HEFT) algorithm, called here P-HEFT, to handle parallel tasks in heterogeneous clusters with good efficiency without compromising the makespan. The results of a comparison of this algorithm with another DAG scheduler using a simulation of several machine configurations and job types shows that P-HEFT gives a shorter makespan for a single DAG but scores worse for multiple DAGs. Finally, the results of the dynamic scheduling of a batch of jobs using the proposed scheduler method showed significant improvements for more heavily loaded machines when compared to the alternative resource reservation approach.