Communication contention in task scheduling

Task scheduling is an essential aspect of parallel programming. Most heuristics for this NP-hard problem are based on a simple system model that assumes fully connected processors and concurrent interprocessor communication. Hence, contention for communication resources is not considered in task sch...

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Veröffentlicht in:IEEE transactions on parallel and distributed systems Jg. 16; H. 6; S. 503 - 515
Hauptverfasser: Sinnen, O., Sousa, L.A.
Format: Journal Article
Sprache:Englisch
Veröffentlicht: New York IEEE 01.06.2005
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Schlagworte:
Algorithms
Communication
communication contention
Communication networks
Communications networks
concurrent programming
Delay
heterogeneous system model
Network topology
NP-hard problem
Parallel processing
Parallel programming
Processor scheduling
Proposals
Reflection
Routing
scheduling and task partitioning
Studies
ISSN:1045-9219, 1558-2183
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Zusammenfassung:Task scheduling is an essential aspect of parallel programming. Most heuristics for this NP-hard problem are based on a simple system model that assumes fully connected processors and concurrent interprocessor communication. Hence, contention for communication resources is not considered in task scheduling, yet it has a strong influence on the execution time of a parallel program. This paper investigates the incorporation of contention awareness into task scheduling. A new system model for task scheduling is proposed, allowing us to capture both end-point and network contention. To achieve this, the communication network is reflected by a topology graph for the representation of arbitrary static and dynamic networks. The contention awareness is accomplished by scheduling the communications, represented by the edges in the task graph, onto the links of the topology graph. Edge scheduling is theoretically analyzed, including aspects like heterogeneity, routing, and causality. The proposed contention-aware scheduling preserves the theoretical basis of task scheduling. It is shown how classic list scheduling is easily extended to this more accurate system model. Experimental results show the significantly improved accuracy and efficiency of the produced schedules.
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ISSN:1045-9219
1558-2183
DOI:10.1109/TPDS.2005.64