Title :
An adaptive value-based scheduling policy for multiprocessor real-time database systems
Author :
Tseng, Shin-Mu ; Chin, Y.H. ; Yang, Wei-Pang
Author_Institution :
Inst. of Comput. & Inf. Sci., Nat. Chiao Tung Univ., Hsinchu, Taiwan
Abstract :
In a real-time application, a transaction may be assigned a value to reflect the profit of completing the transaction before its deadline. Satisfying both goals of maximizing the totally obtained profit and minimizing the number of missed transactions at the same time is a challenge. The authors present an adaptive real-time scheduling policy named value-based processor allocation (VPA-k) for scheduling value-based transactions in a multiprocessor real-time database system. Using the VPA-k policy, the transactions with higher values are given higher priorities to execute first, while at most k percentage of total processors are dynamically allocated to execute the urgent transactions. Through simulation experiments, VPA-k is shown to outperform other scheduling policies substantially in both maximizing the totally obtained profit and minimizing the number of missed transactions under various system environments.
Keywords :
database management systems; multiprocessing systems; processor scheduling; real-time systems; resource allocation; scheduling; transaction processing; virtual machines; adaptive real-time scheduling policy; adaptive value-based scheduling policy; dynamic processor allocation; maximized totally obtained profit; minimized missed transactions; multiprocessor real-time database systems; priorities; simulation experiments; system environments; transaction value assignment; urgent transactions; value-based processor allocation; Adaptive scheduling; Application software; Computer science; Database systems; Information science; Multiprocessing systems; Parallel processing; Processor scheduling; Real time systems; Scheduling algorithm;
Conference_Titel :
Database and Expert Systems Applications, 1997. Proceedings., Eighth International Workshop on
Conference_Location :
Toulouse, France
Print_ISBN :
0-8186-8147-0
DOI :
10.1109/DEXA.1997.617281