QoS control method to reduce resource reservation failure in datagrid applications

Large scale grid computing uses a broadband link for high performance computing. However, since this approach is extremely costly, it would be more ideal to use a network that is inexpensive and that at the same time guarantees good computation quality. While the scheduler of grid can reserve many computing resources to achieve this goal, the prevention of resource reservation failure remains to be an issue at hand. We examined the dynamic bandwidth adjustment method used in DataGrid application. Guaranteeing the quality of each data transmission, this method operates by reserving bandwidth for each data flow using the Diffserv AF service and adjusting reserved bandwidth periodically. Three methods, the EF based method, the AF based method and the proposed method, were simulated for performance comparison and evaluation. The results show that the proposed method had the same, if not better, performance.