A DYNAMIC SCHEDULING ALGORITHM IN HETEROGENEOUS COMPUTING ENVIRONMENTS

• Main Authors: Chin-Chih Lien, 連錦池
• Other Authors: Prof. Liang-Teh Lee
• Format: Others
• Language: en_US
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/71334674727288755224

碩士 === 大同大學 === 資訊工程學系(所) === 94 === Diverse sets of resources interconnected with Internet provide a new computing platform, called the grid computing system, which can support execution of computationally intensive parallel and distributed applications. The main characteristics of grid computing system are similar to the heterogeneous computing system except the fluctuant transfer rate. For this major difference, the existing algorithms for supporting heterogeneous processors have to make some modifications in order to achieve a better performance of entire system. A dynamic scheduling algorithm, called Dynamic HEFT (DH) algorithm is proposed in this thesis to enhance the functions of the original static HEFT (SH) algorithm. Instead of dispatching tasks to physical processors directly, the DH algorithm dispatches tasks to multiple queues. During runtime, the DH algorithm continues to dispatch the scheduled tasks to corresponding physical processor and predicts the transfer rate. Once the difference between two consecutive transfer rates is greater than the threshold value, rescheduling will be performed. The experimental results show that the proposed DH algorithm performs better than the SH algorithm in the system, especially under the grid computing environment, with fluctuant transfer rate and high bandwidth differences.