cloudsim教程_云计算教程

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如何使用cloudsim?

直接上github搜索cloudsim

Release cloudsim-3.0 · Cloudslab/cloudsim · GitHub

首先来个源代码，这个是cloudsimexample1

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;
import java.util.ArrayList;
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;
/** * A simple example showing how to create a datacenter with one host and run one * cloudlet on it. */
public class CloudSimExample1 { 

/** The cloudlet list. */
private static List<Cloudlet> cloudletList;
/** The vmlist. */
private static List<Vm> vmlist;
/** * Creates main() to run this example. * * @param args the args */
public static void main(String[] args) { 

Log.printLine("Starting CloudSimExample1...");
try { 

// First step: Initialize the CloudSim package. It should be called
// before creating any entities.
int num_user = 1; // number of cloud users
Calendar calendar = Calendar.getInstance();
boolean trace_flag = false; // mean trace events
// Initialize the CloudSim library
CloudSim.init(num_user, calendar, trace_flag);
// Second step: Create Datacenters
// Datacenters are the resource providers in CloudSim. We need at
// list one of them to run a CloudSim simulation
Datacenter datacenter0 = createDatacenter("Datacenter_0");
// Third step: Create Broker
DatacenterBroker broker = createBroker();
int brokerId = broker.getId();
// Fourth step: Create one virtual machine
vmlist = new ArrayList<Vm>();
// VM description
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
Vm vm = new Vm(vmid, brokerId, mips, pesNumber, ram, bw, size, vmm, new CloudletSchedulerTimeShared());
// add the VM to the vmList
vmlist.add(vm);
// submit vm list to the broker
broker.submitVmList(vmlist);
// Fifth step: Create one Cloudlet
cloudletList = new ArrayList<Cloudlet>();
// properties
int id = 0;
long length = 400000;
long fileSize = 300;
long outputSize = 300;
UtilizationModel utilizationModel = new UtilizationModelFull();
Cloudlet cloudlet = new Cloudlet(id, length, pesNumber, fileSize, outputSize, utilizationModel, utilizationModel, utilizationModel);
cloudlet.setUserId(brokerId);
cloudlet.setVmId(vmid);
// add the cloudlet to the list
cloudletList.add(cloudlet);
// submit cloudlet list to the broker
broker.submitCloudletList(cloudletList);
// Sixth step: Starts the simulation
CloudSim.startSimulation();
CloudSim.stopSimulation();
//Final step: Print results when simulation is over
List<Cloudlet> newList = broker.getCloudletReceivedList();
printCloudletList(newList);
// Print the debt of each user to each datacenter
datacenter0.printDebts();
Log.printLine("CloudSimExample1 finished!");
} catch (Exception e) { 

e.printStackTrace();
Log.printLine("Unwanted errors happen");
}
}
/** * Creates the datacenter. * * @param name the name * * @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
List<Host> hostList = new ArrayList<Host>();
// 2. A Machine contains one or more PEs or CPUs/Cores.
// 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.
peList.add(new Pe(0, new PeProvisionerSimple(mips))); // need to store Pe id and MIPS Rating
// 4. Create Host with its id and list of PEs and add them to the list
// of machines
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)
)
); // This is our machine
// 5. Create a DatacenterCharacteristics object that stores the
// properties of a data center: architecture, OS, list of
// Machines, allocation policy: time- or space-shared, time zone
// and its price (G$/Pe time unit).
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
DatacenterCharacteristics characteristics = new DatacenterCharacteristics(
arch, os, vmm, hostList, time_zone, cost, costPerMem,
costPerStorage, costPerBw);
// 6. Finally, we need to create a PowerDatacenter object.
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
/** * Creates the broker. * * @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 */
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()));
}
}
}
}

这个代码的目的是创造一个主机，一个任务的数据中心

但是第一次看到这个肯定看的云里雾里的，下面就来先分析一下这些玩意是干什么的。

• Datacenter，顾名思义就是数据中心

• DatacenterBroker，这个是数据中心代理，负责云计算中根据用户的qos要求协调用户以及服务供应商，以后vm绑定数据中心，还有cloudlet绑定数据中心，以及vm绑定cloudlet都和这个broker有关

• Cloudlet，这个是指令，有四个属性

  int id = 0;就是指令的id
  long length = 40000;指令的长度
  long fileSize = 300;文件的大小
  long outputSize = 300;输出的大小
  

• UtilizationModel，在构造cloudlet的时候，这个是必须的，是一个应用的模型

流程分析

1. 首先是cloudsim的初始化，需要三个参数CloudSim.init(num_user, calendar, trace_flag)，分别是云用户的数量，日期，还有是否跟踪事件。

2. 第二部开始构建数据中心，这里的实例有一个代码

   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
   //使用一个list来存放我们的主机
   List<Host> hostList = new ArrayList<Host>();
   // 2. A Machine contains one or more PEs or CPUs/Cores.
   // In this example, it will have only one core.
   List<Pe> peList = new ArrayList<Pe>();
   //一个主机有多个pes或者是cpu
   //mips就是单位时间处理命令的量
   int mips = 1000;
   // 3. Create PEs and add these into a list.
   //创建pes并且加入到list里面
   peList.add(new Pe(0, new PeProvisionerSimple(mips))); // need to store Pe id and MIPS Rating
   // 4. Create Host with its id and list of PEs and add them to the list
   // of machines
   int hostId = 0;
   int ram = 2048; // host memory (MB)主机内存
   long storage = 1000000; // host storage应该是外存
   int bw = 10000;//带宽
   hostList.add(
   new Host(
   hostId,
   new RamProvisionerSimple(ram),
   new BwProvisionerSimple(bw),
   storage,
   peList,
   new VmSchedulerTimeShared(peList)虚拟机的时间共享分配策略
   )
   ); // This is our machine
   // 5. Create a DatacenterCharacteristics object that stores the
   // properties of a data center: architecture, OS, list of
   // Machines, allocation policy: time- or space-shared, time zone
   // and its price (G$/Pe time unit).
   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
   DatacenterCharacteristics characteristics = new DatacenterCharacteristics(
   arch, os, vmm, hostList, time_zone, cost, costPerMem,
   costPerStorage, costPerBw);
   // 6. Finally, we need to create a PowerDatacenter object.
   Datacenter datacenter = null;
   try { 
   
   datacenter = new Datacenter(name, characteristics, new VmAllocationPolicySimple(hostList), storageList, 0);
   } catch (Exception e) { 
   
   e.printStackTrace();
   }
   return datacenter;
   }
   

3. 创建虚拟中心代理

4. 创建虚拟机

5. 创建云任务，设定任务数量

6. 分配任务到虚拟机上

7. 启动仿真