DBEFT: A Dependency-Ratio Bundling Earliest Finish Time Algorithm for Heterogeneous Computing

Abstract

Performance effective task scheduling algorithms are essential for taking advantage of the heterogeneous multi-processor in heterogeneous computing environments. In this paper, we present a task scheduling algorithm named as Dependency-ratio Bundling Earliest Finish Time (DBEFT). DBEFT is a list based scheduling algorithm combined with task duplication, which can achieve high performance and low time complexity simultaneously. DBEFT selects the task from the perspective of extending parallelism between tasks instead of giving priorities to tasks on the critical path. Also, DBEFT reduces communication cost by adopting a bundling scheduling strategy. The experiments were conducted on both random graph set and real-world applications, and the results show that DBEFT obtained significant performance improvement, outperforming CEFT by 15%, PEFT by 30% and HEFT 33% in terms of SLR respectively. INDEX TERMS Heterogeneous system, task scheduling, task duplication, task dependency ratio, bundling scheduling.

Levelized Multiple Workflow Allocation Strategy Under Precedence Constraints With Task Merging in IaaS Cloud Environment

“…These models can be categorized into a single workflow and multi-workflow allocation models. Further, Single workflow models are classified into static workflow allocation models [25,26,27,28,29,30,31,32,33,34,39,40,41,42,43,44,45,46,47,48] and dynamic workflow allocation models [35,36,37,38]. Static workflow allocation is done at compile time.…”

“…As soon as new tasks arrive, the scheduler dynamically decides the possibility of allocating these new tasks without exposing the assurances provided. The static single workflow allocation approach can be extended into list scheduling [25,26,27,28,29,30,31,32,33,34,40], clustering [41,42,43,44,45,46,47,48], etc.…”

“…The authors of [29], proposed a listbased workflow scheduling method inspired by HEFT for non-preemptive periodic tasks, reporting better performance. DBEFT has been proposed [30]. DBEFT is an extended work of HEFT with the same objective.…”