网格环境下井下实时通信系统任务调度策略

Tasks scheduling strategies of real-time communication systems in mine based on grid computing

针对网格环境下井下实时通信系统的任务调度问题,提出井下实时通信系统的架构,并应用反馈控制理论对该多输入多输出系统进行状态空间建模,分析该系统模型的稳定性、稳态增益、稳定时间和最大偏移量4个特性。基于该模型设计的井下实时通信系统的动态自适应反馈控制器,能够使该系统的控制输出和控制输入进行自适应调节,同时,提出一种适合该系统模型的任务调度算法。模拟实验结果表明,在CPU平均利用率和任务平均丢失率这2个系统指标上,该任务调度算法优于现有任务调度算法。

Aimed at RCSM’s (real-time communication systems in mine) failure to process data in time due to RCSM use of common computer network when the RCSM processes a mass of data, the solution was studied to the vast amount of data processed by applying grid computing techniques to the RCSM. Tasks scheduling holds the key to solving this problem. The attempt to eliminate the problem arising from tasks scheduling of the RCSM based on grid computing results in the proposed architecture of the RCSM to develop state-space model of the multi inputs and multi outputs systems depending on feedback control theory. An analysis of the four characters of the RCSM model was put forward, i.e., stability, steady-state gain, settling time, and maximum overshoot. The RCSM model-based dynamic adaptive feedback controller allows the adaptive adjustment of both the measured outputs and control inputs. Tasks scheduling algorithm was adapted to the RCSM. Simulation experimental results show that the proposed algorithm is better than other existing algorithms in terms of the two system indexes of CPU average utilization and task average missing ratio.