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CloudSim Example 1

cloudsim 教程例1解读

创建一个含一台主机的数据中心，并在其上运行一个云任务

代码

package org.cloudbus.cloudsim.examples;
/* * Title: CloudSim Toolkit * Description: CloudSim (Cloud Simulation) Toolkit for Modeling and Simulation * of Clouds * Licence: GPL - http://www.gnu.org/copyleft/gpl.html * * Copyright (c) 2009, The University of Melbourne, Australia */
import java.text.DecimalFormat; //处理文本、日期、数字和消息的类和接口
import java.util.ArrayList; 	//Java的实用工具类库java.util包
import java.util.Calendar;
import java.util.LinkedList;
import java.util.List;
import org.cloudbus.cloudsim.Cloudlet;
import org.cloudbus.cloudsim.CloudletSchedulerTimeShared;
import org.cloudbus.cloudsim.Datacenter;
import org.cloudbus.cloudsim.DatacenterBroker;
import org.cloudbus.cloudsim.DatacenterCharacteristics;
import org.cloudbus.cloudsim.Host;
import org.cloudbus.cloudsim.Log;
import org.cloudbus.cloudsim.Pe;
import org.cloudbus.cloudsim.Storage;
import org.cloudbus.cloudsim.UtilizationModel;
import org.cloudbus.cloudsim.UtilizationModelFull;
import org.cloudbus.cloudsim.Vm;
import org.cloudbus.cloudsim.VmAllocationPolicySimple;
import org.cloudbus.cloudsim.VmSchedulerTimeShared;
import org.cloudbus.cloudsim.core.CloudSim;
import org.cloudbus.cloudsim.provisioners.BwProvisionerSimple;
import org.cloudbus.cloudsim.provisioners.PeProvisionerSimple;
import org.cloudbus.cloudsim.provisioners.RamProvisionerSimple;
//cloudsim相关包
public class CloudSimExample1 { 

/** The cloudlet list. */ 云任务列表
private static List<Cloudlet> cloudletList;
/** The vmlist. */ 虚拟机列表
private static List<Vm> vmlist;
@SuppressWarnings("unused") 
//主函数运行
public static void main(String[] args) { 

Log.printLine("Starting CloudSimExample1...");  //结果输出
try { 

// 第一步：初始化工具包
int num_user = 1; // number of cloud users 云用户数量
Calendar calendar = Calendar.getInstance(); // 用当前日期和时间初始化字段的日历
boolean trace_flag = false; // trace events 事件跟踪
************************************************************************************************/
*  Comment Start 
* Initialize the CloudSim library. 
* init()调用 initCommonVariable(), initCommonVariable()反过来调用initialize()
(all these 3 methods are defined in CloudSim.java).
* initialize() 创建了两个集合 - an 数组列表 of SimEntity 数组对象 (表示模拟实体的named entities) and 
* a LinkedHashMap 链表哈希映射 (named entitiesByName 表示相同模拟实体的LinkedHashMap), 
以每个SimEntity的名称作为键.
* initialize() 创建两个队列 - a Queue of SimEvents (future) and another Queue of SimEvents (deferred). 
* initialize() creates a 哈希表 of 预测 (以整数为键) - these predicates are used 
to select a particular event from the deferred queue. 
* initialize() sets the simulation clock to 0 and running (a boolean flag) to false.
* 一旦initialize()返回(请注意，我们现在处于方法initCommonVariable()中), 
就会创建一个CloudSimShutDown(从SimEntity派生而来)实例
* (with numuser as 1, its name as CloudSimShutDown, id as -1, and state as RUNNABLE). 
然后将这个新实体添加到模拟中
* 当添加到模拟中时，它的id变为0(从前面的-1). 两个集合 - entities 和 entitiesByName 使用此SimEntity更新.
* the shutdownId (whose default value was -1) is 0    
* 一旦initCommonVariable()返回(请注意，我们现在是在方法init()中), 就会创建一个        
CloudInformationService(它也派生自SimEntity)实例
* (with its name as CloudInformatinService, id as -1, and state as RUNNABLE). 
然后这个新实体也被添加到模拟中. 
* While being added to the simulation, the id of the SimEntitiy is changed to 1 
(which is the next id) from its earlier value of -1. 
* 两个集合 - entities 和 entitiesByName are updated with this SimEntity.
* the cisId(whose default value is -1) is 1
* Comment End - Dinesh Bhagwat 
************************************************************************************************/
CloudSim.init(num_user, calendar, trace_flag);
// 第二步：创建数据中心
// Datacenters are the resource providers in CloudSim. We need at
// list one of them to run a CloudSim simulation
Datacenter datacenter0 = createDatacenter("Datacenter_0");
// 第三步: Create Broker 代理
DatacenterBroker broker = createBroker();
int brokerId = broker.getId();
// 第四步: Create one virtual machine
vmlist = new ArrayList<Vm>();
// VM 参数
int vmid = 0;
int mips = 1000;
long size = 10000; // image size (MB)
int ram = 512; // vm memory (MB)
long bw = 1000;
int pesNumber = 1; // number of cpus
String vmm = "Xen"; // VMM name
// create VM 以刚才定义的参数创建VM
Vm vm = new Vm(vmid, brokerId, mips, pesNumber, ram, bw, size, vmm, new CloudletSchedulerTimeShared());
// add the VM to the vmList 加入虚拟机列表
vmlist.add(vm);
// submit vm list to the broker 虚拟机列表提交给代理
broker.submitVmList(vmlist);
// 第五步: Create one Cloudlet 创建一个云任务
cloudletList = new ArrayList<Cloudlet>();
// Cloudlet 参数
int id = 0;
long length = 400000;
long fileSize = 300;
long outputSize = 300;
UtilizationModel utilizationModel = new UtilizationModelFull();
// create cloudlet 以刚才定义的参数创建云任务
Cloudlet cloudlet = 
new Cloudlet(id, length, pesNumber, fileSize, 
outputSize, utilizationModel, utilizationModel, 
utilizationModel);
cloudlet.setUserId(brokerId);
cloudlet.setVmId(vmid);
// add the cloudlet to the list 云任务加入列表
cloudletList.add(cloudlet);
// submit cloudlet list to the broker 云任务列表提交给代理
broker.submitCloudletList(cloudletList);
// 第六步: Starts the simulation 开始仿真
CloudSim.startSimulation();
CloudSim.stopSimulation();
//最后一步: Print results when simulation is over 仿真结束 打印结果
List<Cloudlet> newList = broker.getCloudletReceivedList();
printCloudletList(newList);
Log.printLine("CloudSimExample1 finished!");
} catch (Exception e) { 
             Java Exception 异常处理机制
e.printStackTrace();
Log.printLine("Unwanted errors happen");
}
}
/**函数 * Creates the datacenter. * * @命名 * * @return the datacenter */
private static Datacenter createDatacenter(String name) { 

// Here are the steps needed to create a PowerDatacenter:
// 1. We need to create a list to store
// our machine 创建列表储存机器
List<Host> hostList = new ArrayList<Host>();
// 2. A Machine contains one or more PEs or CPUs/Cores. 一个机器含有的处理器
// In this example, it will have only one core.
List<Pe> peList = new ArrayList<Pe>();
int mips = 1000;
// 3. Create PEs and add these into a list. 创建处理器 并添加到Pe列表
peList.add(new Pe(0, new PeProvisionerSimple(mips))); // need to store Pe id and MIPS Rating Pe id 和 处理速度
// 4. Create Host with its id and list of PEs and add them to the list
// of machines 创建主机
int hostId = 0;
int ram = 2048; // host memory (MB)
long storage = 1000000; // host storage
int bw = 10000;
hostList.add(
new Host(
hostId,
new RamProvisionerSimple(ram),
new BwProvisionerSimple(bw),
storage,
peList,
new VmSchedulerTimeShared(peList) 虚拟机时间共享
)
); // This is our machine
// 5. 创建一个数据中心特征对象，
// 该对象存储数据中心的属性:体系结构、操作系统、机器列表、
// 分配策略:时间或空间共享、时区及其价格(G$/Pe时间单位)
String arch = "x86"; // system architecture
String os = "Linux"; // operating system
String vmm = "Xen";
double time_zone = 10.0; // time zone this resource located
double cost = 3.0; // the cost of using processing in this resource
double costPerMem = 0.05; // the cost of using memory in this resource
double costPerStorage = 0.001; // the cost of using storage in this resource
double costPerBw = 0.0; // the cost of using bw in this resource
LinkedList<Storage> storageList = new LinkedList<Storage>(); // we are not adding SAN devices by now
//特征对象属性
DatacenterCharacteristics characteristics = new DatacenterCharacteristics(
arch, os, vmm, hostList, time_zone, cost, costPerMem,
costPerStorage, costPerBw);
// 6. 最后, 创建数据中心对象
Datacenter datacenter = null;
try { 

datacenter = new Datacenter(name, characteristics, new VmAllocationPolicySimple(hostList), storageList, 0);
} catch (Exception e) { 

e.printStackTrace();
}
return datacenter;
}
// We strongly encourage users to develop their own broker policies, to
// submit vms and cloudlets according
// to the specific rules of the simulated scenario
/** 创建代理，可以根据特定需求发展自己的代理协议来提交虚拟机和云任务 * * @return the datacenter broker */
private static DatacenterBroker createBroker() { 

DatacenterBroker broker = null;
try { 

broker = new DatacenterBroker("Broker");
} catch (Exception e) { 

e.printStackTrace();
return null;
}
return broker;
}
/** * Prints the Cloudlet objects. * * @param list list of Cloudlets */打印云任务参数
private static void printCloudletList(List<Cloudlet> list) { 

int size = list.size();
Cloudlet cloudlet;
String indent = " ";
Log.printLine();
Log.printLine("========== OUTPUT ==========");
Log.printLine("Cloudlet ID" + indent + "STATUS" + indent
+ "Data center ID" + indent + "VM ID" + indent + "Time" + indent
+ "Start Time" + indent + "Finish Time");
DecimalFormat dft = new DecimalFormat("###.##");
for (int i = 0; i < size; i++) { 

cloudlet = list.get(i);
Log.print(indent + cloudlet.getCloudletId() + indent + indent);
if (cloudlet.getCloudletStatus() == Cloudlet.SUCCESS) { 

Log.print("SUCCESS");
Log.printLine(indent + indent + cloudlet.getResourceId()
+ indent + indent + indent + cloudlet.getVmId()
+ indent + indent
+ dft.format(cloudlet.getActualCPUTime()) + indent
+ indent + dft.format(cloudlet.getExecStartTime())
+ indent + indent
+ dft.format(cloudlet.getFinishTime()));
}
}
}
}

运行结果：