一种基于松弛时间的服务网格资源能力预留机制

通过资源能力预留为网格服务提供确定的QoS保证是实现服务网格QoS管理的基础和关键.针对确定性资源能力预留的"资源能力碎片"问题,提出了一种支持松弛时间的灵活资源能力预留机制,并设计了支持松弛时间的资源预留请求接纳控制算法.在CROWN的节点服务器上实现了该机制,并通过仿真实验进行性能评价.结果表明,和已有的确定型预留机制相比,支持松弛时间的资源能力预留机制,使资源能力调度具有更多的自主性,可显著地提高网格资源的综合利用效率.

Flexible Resource Capacity Reservation Mechanism for Service Grid Using Slack Time

Resource reservation and allocation is commonly used to provide QoS guarantee for grid services. However, the reservation request with fixed parameters may introduce resource capacity fragment problem caused by the peaks of resource utilization. In this paper, a flexible capacity reservation mechanism is proposed, in which slack time is added into the reservation scenario to get more flexibility of resource reservation. Beside this, an algorithm is introduced to support the reservation and admission control with slack time. Four strategies are proposed according to the existing scheduling algorithms. The algorithm is implemented in CROWN service grid middleware. Evaluation result shows that better performance can be achieved by using slack-enabled algorithm, and the min-min-based strategy performs better.