澳洲IT作业代写 云堆栈

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云堆栈的最顶层是用户代码层，它指定引用主机的组件，如涉及的机器的架构和此类机器的数量等。它还指定用户为主机声明的服务和那些应用程序的配置。此层还指示应用程序的类型、代理调度策略、用户特征(如用户数量、每个用户请求的服务类型等)。云堆栈的下一层是CloudSim层，它负责用户指定的基于云的应用程序的模拟和建模。这一层最初包含用于cloudlet和虚拟机的接口。这些接口依次调用执行cloudlet和处理创建的虚拟机的服务。虚拟机的处理涉及内存、存储、带宽、CPU周期等资源的管理。这一层还负责虚拟机供应，它处理诸如允许磁盘访问、允许下载VM(即读取与VM相关的文件)、克隆虚拟机等任务。下一层包含用于处理事件、数据中心特征、代理请求等的所有云资源。最后，CloudSim堆栈的最后一层是网络层，它负责处理错误和消息传递、吞吐量计算、延迟计算，并为应用程序实现正确的网络拓扑类型(即星型、网状、集线器等)。网络拓扑还负责接收来自消息发送者的消息，并在内部计算网络延迟，然后将其发送到CloudSim模拟引擎。
澳洲IT作业代写 云堆栈
The topmost layer of the Cloud stack is the User Code Layer that specifies the components that refer to the hosts such as the architecture of the machines involved and the number of such machines etc. It also specifies the services that are declared by the user for the hosts and the configuration of those application. This layer also indicates the types of applications, broker scheduling policies, user characteristics (such as number of users, type of services requested by each user etc.).The next layer of the Cloud stack is the CloudSim layer, which is responsible for the simulation and modelling of cloud-based applications as specified by the user. This layer initially contains interfaces for Cloudlets and Virtual Machines. These interfaces in turn call forth services for the execution of the Cloudlets and also for handling the Virtual Machines that were created. Handling of the virtual machines involves the management of resources such as memory, storage, bandwidth, CPU cycles etc. This layer is also responsible for Virtual Machine provisioning, which handles tasks such as allowing disk access, allowing the VM to be downloaded (i.e. read files associated with a VM), clone Virtual Machine etc. The next layer encompasses all the Cloud resources that are used for handling events, data center characteristics, broker requests etc. Finally, the last layer in the CloudSim stack is the network layer which is responsible for handling error and message passing, throughput calculation, delay calculation and implementing the right type of network topology (i.e. star, mesh, hub etc.) for the application. The network topology is also responsible for receiving messages from the message sender and internally calculating the network delay and then transmitting it to the CloudSim simulation engine