Abstract: Elastic scheduling is designed for real-time systems with variable load. It adjusts the task attributes dynamically to meet the flexibility requirements of system, and it is an effective task scheduling strategy. Concerning the research results and problems of elastic scheduling, an overview of elastic scheduling was given out, and the research progress of the elastic periodic task model, scheduling model and the elastic scheduling algorithm were analyzed. The existing problems in research were investigated, and possible research areas in future were suggested.

Key words: real-time system, system performance, elasticity scheduling, task model, scheduling algorithm

摘要： 弹性调度面向负载可变的实时系统，通过动态调整任务属性以满足系统的灵活性要求，是一种高效的任务调度策略。针对弹性调度研究中的成果及问题，概述了弹性调度的研究背景，从任务模型、调度模型以及调度算法三个方面对弹性调度的国内外研究进展进行综述，探讨当前研究中存在的问题，并对弹性调度未来研究工作进行分析和展望。

关键词: 实时系统, 系统性能, 弹性调度, 任务模型, 调度算法