Scheduling Problems in a Practical Allocation Model

Scheduling Problems in a Practical Allocation Model (1998)

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by Lisa Hollermann , Tsan-sheng Hsu , Dian Rae Lopez , Keith Vertanen

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Datum	Value	Source
TITLE	Scheduling Problems in a Practical Allocation Model	user correction - Legacy Corrections
AUTHOR NAME	Lisa Hollermann	user correction - Legacy Corrections
AUTHOR AFFIL	y	user correction - Legacy Corrections
AUTHOR NAME	Tsan-sheng Hsu	user correction - Legacy Corrections
AUTHOR NAME	Dian Rae Lopez	user correction - Legacy Corrections
AUTHOR AFFIL	x	user correction - Legacy Corrections
AUTHOR NAME	Keith Vertanen	user correction - Legacy Corrections
AUTHOR ADDR	; Institute of Information Science; Division of Science and Mathematics, University of Minnesota, Morris	user correction - Legacy Corrections
ABSTRACT	A parallel computational model is defined which addresses I/O contention, latency, and pipe-lined message passing between tasks allocated to different processors. The model can be used for parallel task-allocation on either a network of workstations or on a multi-stage inter-connected parallel machine. To study performance bounds more closely, basic properties are developed for when the precedence constraints form a directed tree. It is shown that the problem of optimally scheduling a directed onelevel precedence tree on an unlimited number of identical processors in this model is NP-hard. The problem of scheduling a directed two-level precedence tree is also shown to be NP-hard even when the system latency is zero. An approximation algorithm is then presented for scheduling directed one-level task trees on an unlimited number of processors with an approximation ratio of 3. Simulation results show that this algorithm is, in fact, much faster than its worstcase performance bound. Better...	user correction - Legacy Corrections
YEAR	1998	user correction - Legacy Corrections
CITATIONS	23 found	ParsCit 1.0