/*
* 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.List;
import org.cloudbus.cloudsim.core.CloudSim;
/**
* CloudletSchedulerSpaceShared implements a policy of scheduling performed by a virtual machine. It
* consider that there will be only one cloudlet per VM. Other cloudlets will be in a waiting list.
* We consider that file transfer from cloudlets waiting happens before cloudlet execution. I.e.,
* even though cloudlets must wait for CPU, data transfer happens as soon as cloudlets are
* submitted.
*
* @author Rodrigo N. Calheiros
* @author Anton Beloglazov
* @since CloudSim Toolkit 1.0
*/
public class CloudletSchedulerSpaceShared extends CloudletScheduler {
/** The cloudlet waiting list. */
private List<? extends ResCloudlet> cloudletWaitingList;
/** The cloudlet exec list. */
private List<? extends ResCloudlet> cloudletExecList;
/** The cloudlet paused list. */
private List<? extends ResCloudlet> cloudletPausedList;
/** The cloudlet finished list. */
private List<? extends ResCloudlet> cloudletFinishedList;
/** The current CPUs. */
protected int currentCpus;
/** The used PEs. */
protected int usedPes;
/**
* Creates a new CloudletSchedulerSpaceShared object. This method must be invoked before
* starting the actual simulation.
*
* @pre $none
* @post $none
*/
public CloudletSchedulerSpaceShared() {
super();
cloudletWaitingList = new ArrayList<ResCloudlet>();
cloudletExecList = new ArrayList<ResCloudlet>();
cloudletPausedList = new ArrayList<ResCloudlet>();
cloudletFinishedList = new ArrayList<ResCloudlet>();
usedPes = 0;
currentCpus = 0;
}
/**
* Updates the processing of cloudlets running under management of this scheduler.
*
* @param currentTime current simulation time
* @param mipsShare array with MIPS share of each processor available to the scheduler
* @return time predicted completion time of the earliest finishing cloudlet, or 0 if there is
* no next events
* @pre currentTime >= 0
* @post $none
*/
@Override
public double updateVmProcessing(double currentTime, List<Double> mipsShare) {
setCurrentMipsShare(mipsShare);
double timeSpam = currentTime - getPreviousTime(); // time since last update
double capacity = 0.0;
int cpus = 0;
for (Double mips : mipsShare) { // count the CPUs available to the VMM
capacity += mips;
if (mips > 0) {
cpus++;
}
}
currentCpus = cpus;
capacity /= cpus; // average capacity of each cpu
// each machine in the exec list has the same amount of cpu
for (ResCloudlet rcl : getCloudletExecList()) {
rcl.updateCloudletFinishedSoFar((long) (capacity * timeSpam * rcl.getNumberOfPes() * Consts.MILLION));
}
// no more cloudlets in this scheduler
if (getCloudletExecList().size() == 0 && getCloudletWaitingList().size() == 0) {
setPreviousTime(currentTime);
return 0.0;
}
// update each cloudlet
int finished = 0;
List<ResCloudlet> toRemove = new ArrayList<ResCloudlet>();
for (ResCloudlet rcl : getCloudletExecList()) {
// finished anyway, rounding issue...
if (rcl.getRemainingCloudletLength() == 0) {
toRemove.add(rcl);
cloudletFinish(rcl);
finished++;
}
}
getCloudletExecList().removeAll(toRemove);
// for each finished cloudlet, add a new one from the waiting list
if (!getCloudletWaitingList().isEmpty()) {
for (int i = 0; i < finished; i++) {
toRemove.clear();
for (ResCloudlet rcl : getCloudletWaitingList()) {
if ((currentCpus - usedPes) >= rcl.getNumberOfPes()) {
rcl.setCloudletStatus(Cloudlet.INEXEC);
for (int k = 0; k < rcl.getNumberOfPes(); k++) {
rcl.setMachineAndPeId(0, i);
}
getCloudletExecList().add(rcl);
usedPes += rcl.getNumberOfPes();
toRemove.add(rcl);
break;
}
}
getCloudletWaitingList().removeAll(toRemove);
}
}
// estimate finish time of cloudlets in the execution queue
double nextEvent = Double.MAX_VALUE;
for (ResCloudlet rcl : getCloudletExecList()) {
double remainingLength = rcl.getRemainingCloudletLength();
double estimatedFinishTime = currentTime + (remainingLength / (capacity * rcl.getNumberOfPes()));
if (estimatedFinishTime - currentTime < CloudSim.getMinTimeBetweenEvents()) {
estimatedFinishTime = currentTime + CloudSim.getMinTimeBetweenEvents();
}
if (estimatedFinishTime < nextEvent) {
nextEvent = estimatedFinishTime;
}
}
setPreviousTime(currentTime);
return nextEvent;
}
/**
* Cancels execution of a cloudlet.
*
* @param cloudletId ID of the cloudlet being cancealed
* @return the canceled cloudlet, $null if not found
* @pre $none
* @post $none
*/
@Override
public Cloudlet cloudletCancel(int cloudletId) {
// First, looks in the finished queue
for (ResCloudlet rcl : getCloudletFinishedList()) {
if (rcl.getCloudletId() == cloudletId) {
getCloudletFinishedList().remove(rcl);
return rcl.getCloudlet();
}
}
// Then searches in the exec list
for (ResCloudlet rcl : getCloudletExecList()) {
if (rcl.getCloudletId() == cloudletId) {
getCloudletExecList().remove(rcl);
if (rcl.getRemainingCloudletLength() == 0) {
cloudletFinish(rcl);
} else {
rcl.setCloudletStatus(Cloudlet.CANCELED);
}
return rcl.getCloudlet();
}
}
// Now, looks in the paused queue
for (ResCloudlet rcl : getCloudletPausedList()) {
if (rcl.getCloudletId() == cloudletId) {
getCloudletPausedList().remove(rcl);
return rcl.getCloudlet();
}
}
// Finally, looks in the waiting list
for (ResCloudlet rcl : getCloudletWaitingList()) {
if (rcl.getCloudletId() == cloudletId) {
rcl.setCloudletStatus(Cloudlet.CANCELED);
getCloudletWaitingList().remove(rcl);
return rcl.getCloudlet();
}
}
return null;
}
/**
* Pauses execution of a cloudlet.
*
* @param cloudletId ID of the cloudlet being paused
* @return $true if cloudlet paused, $false otherwise
* @pre $none
* @post $none
*/
@Override
public boolean cloudletPause(int cloudletId) {
boolean found = false;
int position = 0;
// first, looks for the cloudlet in the exec list
for (ResCloudlet rcl : getCloudletExecList()) {
if (rcl.getCloudletId() == cloudletId) {
found = true;
break;
}
position++;
}
if (found) {
// moves to the paused list
ResCloudlet rgl = getCloudletExecList().remove(position);
if (rgl.getRemainingCloudletLength() == 0) {
cloudletFinish(rgl);
} else {
rgl.setCloudletStatus(Cloudlet.PAUSED);
getCloudletPausedList().add(rgl);
}
return true;
}
// now, look for the cloudlet in the waiting list
position = 0;
found = false;
for (ResCloudlet rcl : getCloudletWaitingList()) {
if (rcl.getCloudletId() == cloudletId) {
found = true;
break;
}
position++;
}
if (found) {
// moves to the paused list
ResCloudlet rgl = getCloudletWaitingList().remove(position);
if (rgl.getRemainingCloudletLength() == 0) {
cloudletFinish(rgl);
} else {
rgl.setCloudletStatus(Cloudlet.PAUSED);
getCloudletPausedList().add(rgl);
}
return true;
}
return false;
}
/**
* Processes a finished cloudlet.
*
* @param rcl finished cloudlet
* @pre rgl != $null
* @post $none
*/
@Override
public void cloudletFinish(ResCloudlet rcl) {
rcl.setCloudletStatus(Cloudlet.SUCCESS);
rcl.finalizeCloudlet();
getCloudletFinishedList().add(rcl);
usedPes -= rcl.getNumberOfPes();
}
/**
* Resumes execution of a paused cloudlet.
*
* @param cloudletId ID of the cloudlet being resumed
* @return $true if the cloudlet was resumed, $false otherwise
* @pre $none
* @post $none
*/
@Override
public double cloudletResume(int cloudletId) {
boolean found = false;
int position = 0;
// look for the cloudlet in the paused list
for (ResCloudlet rcl : getCloudletPausedList()) {
if (rcl.getCloudletId() == cloudletId) {
found = true;
break;
}
position++;
}
if (found) {
ResCloudlet rcl = getCloudletPausedList().remove(position);
// it can go to the exec list
if ((currentCpus - usedPes) >= rcl.getNumberOfPes()) {
rcl.setCloudletStatus(Cloudlet.INEXEC);
for (int i = 0; i < rcl.getNumberOfPes(); i++) {
rcl.setMachineAndPeId(0, i);
}
long size = rcl.getRemainingCloudletLength();
size *= rcl.getNumberOfPes();
rcl.getCloudlet().setCloudletLength(size);
getCloudletExecList().add(rcl);
usedPes += rcl.getNumberOfPes();
// calculate the expected time for cloudlet completion
double capacity = 0.0;
int cpus = 0;
for (Double mips : getCurrentMipsShare()) {
capacity += mips;
if (mips > 0) {
cpus++;
}
}
currentCpus = cpus;
capacity /= cpus;
long remainingLength = rcl.getRemainingCloudletLength();
double estimatedFinishTime = CloudSim.clock()
+ (remainingLength / (capacity * rcl.getNumberOfPes()));
return estimatedFinishTime;
} else {// no enough free PEs: go to the waiting queue
rcl.setCloudletStatus(Cloudlet.QUEUED);
long size = rcl.getRemainingCloudletLength();
size *= rcl.getNumberOfPes();
rcl.getCloudlet().setCloudletLength(size);
getCloudletWaitingList().add(rcl);
return 0.0;
}
}
// not found in the paused list: either it is in in the queue, executing or not exist
return 0.0;
}
/**
* Receives an cloudlet to be executed in the VM managed by this scheduler.
*
* @param cloudlet the submited cloudlet
* @param fileTransferTime time required to move the required files from the SAN to the VM
* @return expected finish time of this cloudlet, or 0 if it is in the waiting queue
* @pre gl != null
* @post $none
*/
@Override
public double cloudletSubmit(Cloudlet cloudlet, double fileTransferTime) {
// it can go to the exec list
if ((currentCpus - usedPes) >= cloudlet.getNumberOfPes()) {
ResCloudlet rcl = new ResCloudlet(cloudlet);
rcl.setCloudletStatus(Cloudlet.INEXEC);
for (int i = 0; i < cloudlet.getNumberOfPes(); i++) {
rcl.setMachineAndPeId(0, i);
}
getCloudletExecList().add(rcl);
usedPes += cloudlet.getNumberOfPes();
} else {// no enough free PEs: go to the waiting queue
ResCloudlet rcl = new ResCloudlet(cloudlet);
rcl.setCloudletStatus(Cloudlet.QUEUED);
getCloudletWaitingList().add(rcl);
return 0.0;
}
// calculate the expected time for cloudlet completion
double capacity = 0.0;
int cpus = 0;
for (Double mips : getCurrentMipsShare()) {
capacity += mips;
if (mips > 0) {
cpus++;
}
}
currentCpus = cpus;
capacity /= cpus;
// use the current capacity to estimate the extra amount of
// time to file transferring. It must be added to the cloudlet length
double extraSize = capacity * fileTransferTime;
long length = cloudlet.getCloudletLength();
length += extraSize;
cloudlet.setCloudletLength(length);
return cloudlet.getCloudletLength() / capacity;
}
/*
* (non-Javadoc)
* @see cloudsim.CloudletScheduler#cloudletSubmit(cloudsim.Cloudlet)
*/
@Override
public double cloudletSubmit(Cloudlet cloudlet) {
return cloudletSubmit(cloudlet, 0.0);
}
/**
* Gets the status of a cloudlet.
*
* @param cloudletId ID of the cloudlet
* @return status of the cloudlet, -1 if cloudlet not found
* @pre $none
* @post $none
*/
@Override
public int getCloudletStatus(int cloudletId) {
for (ResCloudlet rcl : getCloudletExecList()) {
if (rcl.getCloudletId() == cloudletId) {
return rcl.getCloudletStatus();
}
}
for (ResCloudlet rcl : getCloudletPausedList()) {
if (rcl.getCloudletId() == cloudletId) {
return rcl.getCloudletStatus();
}
}
for (ResCloudlet rcl : getCloudletWaitingList()) {
if (rcl.getCloudletId() == cloudletId) {
return rcl.getCloudletStatus();
}
}
return -1;
}
/**
* Get utilization created by all cloudlets.
*
* @param time the time
* @return total utilization
*/
@Override
public double getTotalUtilizationOfCpu(double time) {
double totalUtilization = 0;
for (ResCloudlet gl : getCloudletExecList()) {
totalUtilization += gl.getCloudlet().getUtilizationOfCpu(time);
}
return totalUtilization;
}
/**
* Informs about completion of some cloudlet in the VM managed by this scheduler.
*
* @return $true if there is at least one finished cloudlet; $false otherwise
* @pre $none
* @post $none
*/
@Override
public boolean isFinishedCloudlets() {
return getCloudletFinishedList().size() > 0;
}
/**
* Returns the next cloudlet in the finished list, $null if this list is empty.
*
* @return a finished cloudlet
* @pre $none
* @post $none
*/
@Override
public Cloudlet getNextFinishedCloudlet() {
if (getCloudletFinishedList().size() > 0) {
return getCloudletFinishedList().remove(0).getCloudlet();
}
return null;
}
/**
* Returns the number of cloudlets runnning in the virtual machine.
*
* @return number of cloudlets runnning
* @pre $none
* @post $none
*/
@Override
public int runningCloudlets() {
return getCloudletExecList().size();
}
/**
* Returns one cloudlet to migrate to another vm.
*
* @return one running cloudlet
* @pre $none
* @post $none
*/
@Override
public Cloudlet migrateCloudlet() {
ResCloudlet rcl = getCloudletExecList().remove(0);
rcl.finalizeCloudlet();
Cloudlet cl = rcl.getCloudlet();
usedPes -= cl.getNumberOfPes();
return cl;
}
/**
* Gets the cloudlet waiting list.
*
* @param <T> the generic type
* @return the cloudlet waiting list
*/
@SuppressWarnings("unchecked")
protected <T extends ResCloudlet> List<T> getCloudletWaitingList() {
return (List<T>) cloudletWaitingList;
}
/**
* Cloudlet waiting list.
*
* @param <T> the generic type
* @param cloudletWaitingList the cloudlet waiting list
*/
protected <T extends ResCloudlet> void cloudletWaitingList(List<T> cloudletWaitingList) {
this.cloudletWaitingList = cloudletWaitingList;
}
/**
* Gets the cloudlet exec list.
*
* @param <T> the generic type
* @return the cloudlet exec list
*/
@SuppressWarnings("unchecked")
protected <T extends ResCloudlet> List<T> getCloudletExecList() {
return (List<T>) cloudletExecList;
}
/**
* Sets the cloudlet exec list.
*
* @param <T> the generic type
* @param cloudletExecList the new cloudlet exec list
*/
protected <T extends ResCloudlet> void setCloudletExecList(List<T> cloudletExecList) {
this.cloudletExecList = cloudletExecList;
}
/**
* Gets the cloudlet paused list.
*
* @param <T> the generic type
* @return the cloudlet paused list
*/
@SuppressWarnings("unchecked")
protected <T extends ResCloudlet> List<T> getCloudletPausedList() {
return (List<T>) cloudletPausedList;
}
/**
* Sets the cloudlet paused list.
*
* @param <T> the generic type
* @param cloudletPausedList the new cloudlet paused list
*/
protected <T extends ResCloudlet> void setCloudletPausedList(List<T> cloudletPausedList) {
this.cloudletPausedList = cloudletPausedList;
}
/**
* Gets the cloudlet finished list.
*
* @param <T> the generic type
* @return the cloudlet finished list
*/
@SuppressWarnings("unchecked")
protected <T extends ResCloudlet> List<T> getCloudletFinishedList() {
return (List<T>) cloudletFinishedList;
}
/**
* Sets the cloudlet finished list.
*
* @param <T> the generic type
* @param cloudletFinishedList the new cloudlet finished list
*/
protected <T extends ResCloudlet> void setCloudletFinishedList(List<T> cloudletFinishedList) {
this.cloudletFinishedList = cloudletFinishedList;
}
/*
* (non-Javadoc)
* @see org.cloudbus.cloudsim.CloudletScheduler#getCurrentRequestedMips()
*/
@Override
public List<Double> getCurrentRequestedMips() {
List<Double> mipsShare = new ArrayList<Double>();
if (getCurrentMipsShare() != null) {
for (Double mips : getCurrentMipsShare()) {
mipsShare.add(mips);
}
}
return mipsShare;
}
/*
* (non-Javadoc)
* @see
* org.cloudbus.cloudsim.CloudletScheduler#getTotalCurrentAvailableMipsForCloudlet(org.cloudbus
* .cloudsim.ResCloudlet, java.util.List)
*/
@Override
public double getTotalCurrentAvailableMipsForCloudlet(ResCloudlet rcl, List<Double> mipsShare) {
double capacity = 0.0;
int cpus = 0;
for (Double mips : mipsShare) { // count the cpus available to the vmm
capacity += mips;
if (mips > 0) {
cpus++;
}
}
currentCpus = cpus;
capacity /= cpus; // average capacity of each cpu
return capacity;
}
/*
* (non-Javadoc)
* @see
* org.cloudbus.cloudsim.CloudletScheduler#getTotalCurrentAllocatedMipsForCloudlet(org.cloudbus
* .cloudsim.ResCloudlet, double)
*/
@Override
public double getTotalCurrentAllocatedMipsForCloudlet(ResCloudlet rcl, double time) {
// TODO Auto-generated method stub
return 0.0;
}
/*
* (non-Javadoc)
* @see
* org.cloudbus.cloudsim.CloudletScheduler#getTotalCurrentRequestedMipsForCloudlet(org.cloudbus
* .cloudsim.ResCloudlet, double)
*/
@Override
public double getTotalCurrentRequestedMipsForCloudlet(ResCloudlet rcl, double time) {
// TODO Auto-generated method stub
return 0.0;
}
@Override
public double getCurrentRequestedUtilizationOfRam() {
// TODO Auto-generated method stub
return 0;
}
@Override
public double getCurrentRequestedUtilizationOfBw() {
// TODO Auto-generated method stub
return 0;
}
}