Performance evaluation of distributed systems

近年来，将数据中心中的计算资源组织为多个应用程序共享的公共基础设施已经引起了相当大的关注。每个应用程序都有自己的工作负载和性能目标。工作量是随时间变化的，因为用户的需求可能会随着时间的推移而变化。在管理数据中心的资源时，一个重要的考虑因素是实现高效的资源利用率和满足各个应用程序的性能目标的高概率。可以使用虚拟化技术来提高资源管理的灵活性。应用程序部署在物理资源上实施的虚拟机上。通过将这些资源动态分配给虚拟机，系统可以适应不断变化的工作负载，并为各个应用程序提供良好的性能。

In recent years, considerable attention has been given to organizing the computing resources in a data centre as a common infrastructure to be shared by multiple applications. Each application has its own workload and performance goal. The workload is time-varying because the demand from users may change over time. In managing the resources in a data centre, an important consideration is to achieve efficient resource utilization and high probability of meeting the performance goal of individual applications. Virtualization technology can be used to improve flexibility in resource management. Applications are deployed on virtual machines which are implemented on physical resources. By dynamically allocating these resources to virtual machines, the system can adapt to changing workloads and provide good performance to individual applications.