/*
* 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) 2009-2012, The University of Melbourne, Australia
*/
package org.cloudbus.cloudsim;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import org.cloudbus.cloudsim.lists.PeList;
import org.cloudbus.cloudsim.provisioners.PeProvisioner;
/**
* VmSchedulerTimeShared is a Virtual Machine Monitor (VMM) allocation policy that allocates one or more PEs
* from a PM to a VM, and allows sharing of PEs by multiple VMs. This class also implements 10% performance degradation due
* to VM migration. This scheduler does not support over-subscription.
*
* Each host has to use is own instance of a VmScheduler
* that will so schedule the allocation of host's PEs for VMs running on it.
*
* @author Rodrigo N. Calheiros
* @author Anton Beloglazov
* @since CloudSim Toolkit 1.0
*/
public class VmSchedulerTimeShared extends VmScheduler {
/** The map of requested mips, where each key is a VM
* and each value is a list of MIPS requested by that VM.
*/
private Map<String, List<Double>> mipsMapRequested;
/** The number of host's PEs in use. */
private int pesInUse;
/**
* Instantiates a new vm time-shared scheduler.
*
* @param pelist the list of PEs of the host where the VmScheduler is associated to.
*/
public VmSchedulerTimeShared(List<? extends Pe> pelist) {
super(pelist);
setMipsMapRequested(new HashMap<String, List<Double>>());
}
@Override
public boolean allocatePesForVm(Vm vm, List<Double> mipsShareRequested) {
/*
* @todo add the same to RAM and BW provisioners
*/
if (vm.isInMigration()) {
if (!getVmsMigratingIn().contains(vm.getUid()) && !getVmsMigratingOut().contains(vm.getUid())) {
getVmsMigratingOut().add(vm.getUid());
}
} else {
if (getVmsMigratingOut().contains(vm.getUid())) {
getVmsMigratingOut().remove(vm.getUid());
}
}
boolean result = allocatePesForVm(vm.getUid(), mipsShareRequested);
updatePeProvisioning();
return result;
}
/**
* Allocate PEs for a vm.
*
* @param vmUid the vm uid
* @param mipsShareRequested the list of mips share requested by the vm
* @return true, if successful
*/
protected boolean allocatePesForVm(String vmUid, List<Double> mipsShareRequested) {
double totalRequestedMips = 0;
double peMips = getPeCapacity();
for (Double mips : mipsShareRequested) {
// each virtual PE of a VM must require not more than the capacity of a physical PE
if (mips > peMips) {
return false;
}
totalRequestedMips += mips;
}
// This scheduler does not allow over-subscription
if (getAvailableMips() < totalRequestedMips) {
return false;
}
getMipsMapRequested().put(vmUid, mipsShareRequested);
setPesInUse(getPesInUse() + mipsShareRequested.size());
if (getVmsMigratingIn().contains(vmUid)) {
// the destination host only experience 10% of the migrating VM's MIPS
totalRequestedMips *= 0.1;
}
List<Double> mipsShareAllocated = new ArrayList<Double>();
for (Double mipsRequested : mipsShareRequested) {
if (getVmsMigratingOut().contains(vmUid)) {
// performance degradation due to migration = 10% MIPS
mipsRequested *= 0.9;
} else if (getVmsMigratingIn().contains(vmUid)) {
// the destination host only experience 10% of the migrating VM's MIPS
mipsRequested *= 0.1;
}
mipsShareAllocated.add(mipsRequested);
}
getMipsMap().put(vmUid, mipsShareAllocated);
setAvailableMips(getAvailableMips() - totalRequestedMips);
return true;
}
/**
* Update allocation of VMs on PEs.
* @too The method is too long and may be refactored to make clearer its
* responsibility.
*/
protected void updatePeProvisioning() {
getPeMap().clear();
for (Pe pe : getPeList()) {
pe.getPeProvisioner().deallocateMipsForAllVms();
}
Iterator<Pe> peIterator = getPeList().iterator();
Pe pe = peIterator.next();
PeProvisioner peProvisioner = pe.getPeProvisioner();
double availableMips = peProvisioner.getAvailableMips();
for (Map.Entry<String, List<Double>> entry : getMipsMap().entrySet()) {
String vmUid = entry.getKey();
getPeMap().put(vmUid, new LinkedList<Pe>());
for (double mips : entry.getValue()) {
while (mips >= 0.1) {
if (availableMips >= mips) {
peProvisioner.allocateMipsForVm(vmUid, mips);
getPeMap().get(vmUid).add(pe);
availableMips -= mips;
break;
} else {
peProvisioner.allocateMipsForVm(vmUid, availableMips);
getPeMap().get(vmUid).add(pe);
mips -= availableMips;
if (mips <= 0.1) {
break;
}
if (!peIterator.hasNext()) {
Log.printConcatLine("There is no enough MIPS (", mips, ") to accommodate VM ", vmUid);
// System.exit(0);
}
pe = peIterator.next();
peProvisioner = pe.getPeProvisioner();
availableMips = peProvisioner.getAvailableMips();
}
}
}
}
}
@Override
public void deallocatePesForVm(Vm vm) {
getMipsMapRequested().remove(vm.getUid());
setPesInUse(0);
getMipsMap().clear();
setAvailableMips(PeList.getTotalMips(getPeList()));
for (Pe pe : getPeList()) {
pe.getPeProvisioner().deallocateMipsForVm(vm);
}
for (Map.Entry<String, List<Double>> entry : getMipsMapRequested().entrySet()) {
allocatePesForVm(entry.getKey(), entry.getValue());
}
updatePeProvisioning();
}
/**
* Releases PEs allocated to all the VMs.
*
* @pre $none
* @post $none
*/
@Override
public void deallocatePesForAllVms() {
super.deallocatePesForAllVms();
getMipsMapRequested().clear();
setPesInUse(0);
}
/**
* Returns maximum available MIPS among all the PEs. For the time shared policy it is just all
* the avaiable MIPS.
*
* @return max mips
*/
@Override
public double getMaxAvailableMips() {
return getAvailableMips();
}
/**
* Sets the number of PEs in use.
*
* @param pesInUse the new pes in use
*/
protected void setPesInUse(int pesInUse) {
this.pesInUse = pesInUse;
}
/**
* Gets the number of PEs in use.
*
* @return the pes in use
*/
protected int getPesInUse() {
return pesInUse;
}
/**
* Gets the mips map requested.
*
* @return the mips map requested
*/
protected Map<String, List<Double>> getMipsMapRequested() {
return mipsMapRequested;
}
/**
* Sets the mips map requested.
*
* @param mipsMapRequested the mips map requested
*/
protected void setMipsMapRequested(Map<String, List<Double>> mipsMapRequested) {
this.mipsMapRequested = mipsMapRequested;
}
}