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CloudSim Plus: A modern, highly extensible and easier-to-use Java 8+ Framework for Modeling and Simulation of Cloud Computing Infrastructures and Services
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/*
* 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.cloudsimplus.datacenters;
import lombok.*;
import org.cloudsimplus.allocationpolicies.VmAllocationPolicy;
import org.cloudsimplus.allocationpolicies.VmAllocationPolicySimple;
import org.cloudsimplus.allocationpolicies.migration.VmAllocationPolicyMigration;
import org.cloudsimplus.autoscaling.VerticalVmScaling;
import org.cloudsimplus.cloudlets.Cloudlet;
import org.cloudsimplus.core.CloudSimEntity;
import org.cloudsimplus.core.CloudSimTag;
import org.cloudsimplus.core.CustomerEntityAbstract;
import org.cloudsimplus.core.Simulation;
import org.cloudsimplus.core.events.PredicateType;
import org.cloudsimplus.core.events.SimEvent;
import org.cloudsimplus.faultinjection.HostFaultInjection;
import org.cloudsimplus.hosts.Host;
import org.cloudsimplus.hosts.HostSimple;
import org.cloudsimplus.hosts.HostSuitability;
import org.cloudsimplus.listeners.DatacenterVmMigrationEventInfo;
import org.cloudsimplus.listeners.EventListener;
import org.cloudsimplus.listeners.HostEventInfo;
import org.cloudsimplus.network.IcmpPacket;
import org.cloudsimplus.power.models.PowerModelDatacenter;
import org.cloudsimplus.power.models.PowerModelDatacenterSimple;
import org.cloudsimplus.resources.DatacenterStorage;
import org.cloudsimplus.resources.SanStorage;
import org.cloudsimplus.util.InvalidEventDataTypeException;
import org.cloudsimplus.util.MathUtil;
import org.cloudsimplus.vms.Vm;
import org.cloudsimplus.vms.VmSimple;
import java.util.*;
import java.util.stream.Stream;
import static java.util.Objects.requireNonNull;
import static java.util.function.Predicate.not;
import static java.util.stream.Collectors.toList;
import static org.cloudsimplus.util.BytesConversion.bitsToBytes;
/**
* Implements the basic features of a Virtualized Cloud Datacenter. It deals
* with processing of VM queries (i.e., handling of VMs) instead of processing
* Cloudlet-related queries.
*
* @author Rodrigo N. Calheiros
* @author Anton Beloglazov
* @since CloudSim Toolkit 1.0
*/
@EqualsAndHashCode(onlyExplicitlyIncluded = true, callSuper = true)
public class DatacenterSimple extends CloudSimEntity implements Datacenter {
@Getter @EqualsAndHashCode.Include
private DatacenterCharacteristics characteristics;
@Getter
private double timeZone;
@Getter
private DatacenterStorage datacenterStorage;
private List hostList;
@Getter
private long activeHostsNumber;
@Getter
private PowerModelDatacenter powerModel = PowerModelDatacenter.NULL;
@Getter
private VmAllocationPolicy vmAllocationPolicy;
@Getter
private double hostSearchRetryDelay;
/**
* The last time some Host on the Datacenter was under or overloaded.
*
* Double.MIN_VALUE is surprisingly not a negative number.
* Initializing this attribute with a too small value makes that the first
* time an under or overload condition is detected,
* it will try immediately to find suitable Hosts for migration.
*/
private double lastUnderOrOverloadedDetection = -Double.MAX_VALUE;
@Getter
private double schedulingInterval;
/** The last time some cloudlet was processed in the Datacenter. */
@Getter(AccessLevel.PROTECTED) @Setter(AccessLevel.PROTECTED)
private double lastProcessTime;
/**
* Indicates if migrations are disabled or not.
*/
private boolean migrationsEnabled;
@Getter
private double bandwidthPercentForMigration;
private final List> onHostAvailableListeners;
private final List> onVmMigrationFinishListeners;
private Map lastMigrationMap;
/**
* Creates a Datacenter with an empty {@link #getDatacenterStorage() storage}
* and a {@link VmAllocationPolicySimple} by default.
*
* NOTE: To change such attributes, just call the respective setters.
*
* @param simulation the CloudSimPlus instance that represents the simulation the Entity belongs
* @param hostList list of {@link Host}s that will compound the Datacenter
* @see #DatacenterSimple(Simulation, List, VmAllocationPolicy, DatacenterStorage)
*/
public DatacenterSimple(final Simulation simulation, final List hostList) {
this(simulation, hostList, new VmAllocationPolicySimple(), new DatacenterStorage());
}
/**
* Creates a Datacenter with an empty {@link #getDatacenterStorage() storage}.
*
* @param simulation the CloudSimPlus instance that represents the simulation the Entity belongs
* @param hostList list of {@link Host}s that will compound the Datacenter
* @param vmAllocationPolicy the policy to be used to allocate VMs into hosts
* @see #DatacenterSimple(Simulation, List, VmAllocationPolicy, DatacenterStorage)
*/
public DatacenterSimple(
final Simulation simulation,
final List hostList,
final VmAllocationPolicy vmAllocationPolicy)
{
this(simulation, hostList, vmAllocationPolicy, new DatacenterStorage());
}
/**
* Creates a Datacenter with an empty {@link #getDatacenterStorage() storage}
* and no Hosts.
*
* @param simulation the CloudSimPlus instance that represents the simulation the Entity belongs
* @param vmAllocationPolicy the policy to be used to allocate VMs into hosts
* @see #DatacenterSimple(Simulation, List, VmAllocationPolicy)
* @see #DatacenterSimple(Simulation, List, VmAllocationPolicy, DatacenterStorage)
* @see #addHost(Host)
* @see #addHostList(List)
*/
public DatacenterSimple(
final Simulation simulation,
final VmAllocationPolicy vmAllocationPolicy)
{
this(simulation, new ArrayList<>(), vmAllocationPolicy, new DatacenterStorage());
}
/**
* Creates a Datacenter attaching a given storage list to its {@link #getDatacenterStorage() storage}.
*
* @param simulation the CloudSimPlus instance that represents the simulation the Entity belongs
* @param hostList list of {@link Host}s that will compound the Datacenter
* @param vmAllocationPolicy the policy to be used to allocate VMs into hosts
* @param storageList the storage list to attach to the {@link #getDatacenterStorage() datacenter storage}
*/
public DatacenterSimple(
final Simulation simulation,
final List hostList,
final VmAllocationPolicy vmAllocationPolicy,
final List storageList)
{
this(simulation, hostList, vmAllocationPolicy, new DatacenterStorage(storageList));
}
/**
* Creates a Datacenter with a given {@link #getDatacenterStorage() storage}.
*
* @param simulation the CloudSimPlus instance that represents the simulation the Entity belongs
* @param hostList list of {@link Host}s that will compound the Datacenter
* @param vmAllocationPolicy the policy to be used to allocate VMs into hosts
* @param storage the {@link #getDatacenterStorage() storage} for this Datacenter
* @see DatacenterStorage#getStorageList()
*/
public DatacenterSimple(
final Simulation simulation,
final List hostList,
final VmAllocationPolicy vmAllocationPolicy,
final DatacenterStorage storage)
{
super(simulation);
setHostList(hostList);
setLastProcessTime(0.0);
setSchedulingInterval(0);
setDatacenterStorage(storage);
setPowerModel(new PowerModelDatacenterSimple(this));
this.onHostAvailableListeners = new ArrayList<>();
this.onVmMigrationFinishListeners = new ArrayList<>();
this.characteristics = new DatacenterCharacteristicsSimple(this);
this.bandwidthPercentForMigration = DEF_BW_PERCENT_FOR_MIGRATION;
this.migrationsEnabled = true;
this.hostSearchRetryDelay = -1;
this.lastMigrationMap = Collections.emptyMap();
setVmAllocationPolicy(vmAllocationPolicy);
}
private void setHostList(final List hostList) {
this.hostList = requireNonNull(hostList);
setupHosts();
}
private void setupHosts() {
long lastHostId = getLastHostId();
for (final Host host : hostList) {
lastHostId = setupHost(host, lastHostId);
}
}
private long getLastHostId() {
return hostList.isEmpty() ? -1 : hostList.get(hostList.size()-1).getId();
}
protected long setupHost(final Host host, long nextId) {
nextId = Math.max(nextId, -1);
if(host.getId() < 0) {
host.setId(++nextId);
}
host.setSimulation(getSimulation());
host.setDatacenter(this);
host.setActive(((HostSimple)host).isActivateOnDatacenterStartup());
return nextId;
}
@Override
public void processEvent(final SimEvent evt) {
if (processCloudletEvents(evt) || processVmEvents(evt) || processNetworkEvents(evt) || processHostEvents(evt)) {
return;
}
LOGGER.trace("{}: {}: Unknown event {} received.", getSimulation().clockStr(), this, evt.getTag());
}
private boolean processHostEvents(final SimEvent evt) {
if (evt.getTag() == CloudSimTag.HOST_ADD) {
processHostAdditionRequest(evt);
return true;
} else if (evt.getTag() == CloudSimTag.HOST_REMOVE) {
processHostRemovalRequest(evt);
return true;
} else if (evt.getTag() == CloudSimTag.HOST_POWER_ON || evt.getTag() == CloudSimTag.HOST_POWER_OFF) {
final HostSimple host = (HostSimple)evt.getData();
host.processActivation(evt.getTag() == CloudSimTag.HOST_POWER_ON);
}
return false;
}
/**
* Process a Host addition request received during simulation runtime.
* @param evt the event to process
*/
private void processHostAdditionRequest(final SimEvent evt) {
getHostFromHostEvent(evt).ifPresent(host -> {
this.addHost(host);
LOGGER.info(
"{}: {}: Host {} added to {} during simulation runtime",
getSimulation().clockStr(), getClass().getSimpleName(), host.getId(), this);
//Notification must be sent only for Hosts added during simulation runtime
notifyOnHostAvailableListeners(host);
});
}
/**
* Process a Host removal request received during simulation runtime.
* @param srcEvt the event to process
*/
private void processHostRemovalRequest(final SimEvent srcEvt) {
final long hostId = (long)srcEvt.getData();
final Host host = getHostById(hostId);
if(Host.NULL.equals(host)) {
LOGGER.warn(
"{}: {}: Host {} was not found to be removed from {}.",
getSimulation().clockStr(), getClass().getSimpleName(), hostId, this);
return;
}
final var fault = new HostFaultInjection(this);
try {
LOGGER.error(
"{}: {}: Host {} removed from {} due to injected failure.",
getSimulation().clockStr(), getClass().getSimpleName(), host.getId(), this);
fault.generateHostFault(host);
} finally{
fault.shutdown();
}
/*If the Host was found in this Datacenter, cancel the message sent to others
* Datacenters to try to find the Host for removal.*/
getSimulation().cancelAll(
getSimulation().getCis(),
evt -> MathUtil.same(evt.getTime(), srcEvt.getTime()) &&
evt.getTag() == CloudSimTag.HOST_REMOVE &&
(long)evt.getData() == host.getId());
}
private Optional getHostFromHostEvent(final SimEvent evt) {
return evt.getData() instanceof Host h ? Optional.of(h) : Optional.empty();
}
private boolean processNetworkEvents(final SimEvent evt) {
if (evt.getTag() == CloudSimTag.ICMP_PKT_SUBMIT) {
processPingRequest(evt);
return true;
}
return false;
}
/**
* Process a received event.
* @param evt the event to be processed
*/
private boolean processVmEvents(final SimEvent evt) {
return switch (evt.getTag()) {
case VM_CREATE_ACK -> processVmCreate(evt);
case VM_VERTICAL_SCALING -> requestVmVerticalScaling(evt);
case VM_DESTROY -> processVmDestroy(evt, false);
case VM_DESTROY_ACK -> processVmDestroy(evt, true);
case VM_MIGRATE -> finishVmMigration(evt, false);
case VM_MIGRATE_ACK -> finishVmMigration(evt, true);
case VM_UPDATE_CLOUDLET_PROCESSING -> updateCloudletProcessing() != Double.MAX_VALUE;
default -> false;
};
}
/**
* Process a {@link CloudSimTag#VM_VERTICAL_SCALING} request,
* trying to scale a Vm resource.
*
* @param evt the received {@link CloudSimTag#VM_VERTICAL_SCALING} event
* @return true if the Vm was scaled, false otherwise
*/
private boolean requestVmVerticalScaling(final SimEvent evt) {
if (evt.getData() instanceof VerticalVmScaling scaling) {
return vmAllocationPolicy.scaleVmVertically(scaling);
}
throw new InvalidEventDataTypeException(evt, "VM_VERTICAL_SCALING", "VerticalVmScaling");
}
private boolean processCloudletEvents(final SimEvent evt) {
return switch (evt.getTag()) {
// New Cloudlet arrives
case CLOUDLET_SUBMIT -> processCloudletSubmit(evt, false);
// New Cloudlet arrives, but the sender asks for an ack
case CLOUDLET_SUBMIT_ACK -> processCloudletSubmit(evt, true);
// Cancels a previously submitted Cloudlet
case CLOUDLET_CANCEL -> processCloudlet(evt, CloudSimTag.CLOUDLET_CANCEL);
// Pauses a previously submitted Cloudlet
case CLOUDLET_PAUSE -> processCloudlet(evt, CloudSimTag.CLOUDLET_PAUSE);
// Pauses a previously submitted Cloudlet, but the sender asks for an acknowledgement
case CLOUDLET_PAUSE_ACK -> processCloudlet(evt, CloudSimTag.CLOUDLET_PAUSE_ACK);
// Resumes a previously submitted Cloudlet
case CLOUDLET_RESUME -> processCloudlet(evt, CloudSimTag.CLOUDLET_RESUME);
// Resumes a previously submitted Cloudlet, but the sender asks for an acknowledgement
case CLOUDLET_RESUME_ACK -> processCloudlet(evt, CloudSimTag.CLOUDLET_RESUME_ACK);
default -> false;
};
}
/**
* Processes a ping request.
*
* @param evt information about the event just happened
*/
protected void processPingRequest(final SimEvent evt) {
if(evt.getData() instanceof IcmpPacket pkt){
pkt.setTag(CloudSimTag.ICMP_PKT_RETURN);
pkt.setDestination(pkt.getSource());
// returns the packet to the sender
sendNow(pkt.getSource(), CloudSimTag.ICMP_PKT_RETURN, pkt);
}
throw new InvalidEventDataTypeException(evt, "ICMP_PKT_SUBMIT", IcmpPacket.class.getName());
}
/**
* Processes a Cloudlet based on the event type.
* @param evt information about the event just happened
* @param tag event tag
* @return true if the event was processed, false otherwise
*/
protected boolean processCloudlet(final SimEvent evt, final CloudSimTag tag) {
if (evt.getData() instanceof Cloudlet cloudlet){
return switch (tag) {
case CLOUDLET_CANCEL -> processCloudletCancel(cloudlet);
case CLOUDLET_PAUSE -> processCloudletPause(cloudlet, false);
case CLOUDLET_PAUSE_ACK -> processCloudletPause(cloudlet, true);
case CLOUDLET_RESUME -> processCloudletResume(cloudlet, false);
case CLOUDLET_RESUME_ACK -> processCloudletResume(cloudlet, true);
default -> {
LOGGER.trace(
"{}: Unable to handle a request from {} with event tag = {}",
this, evt.getSource().getName(), evt.getTag());
yield false;
}
};
}
throw new InvalidEventDataTypeException(evt, "CLOUDLET Tags", Cloudlet.class.getName());
}
/**
* Processes the submission of a Cloudlet by a DatacenterBroker.
* @param evt information about the event just happened
* @param ack indicates if the event's sender expects to receive an acknowledgement
* @return true if the event was processed, false otherwise
*/
protected boolean processCloudletSubmit(final SimEvent evt, final boolean ack) {
if (evt.getData() instanceof Cloudlet cloudlet){
if (cloudlet.isFinished()) {
notifyBrokerAboutAlreadyFinishedCloudlet(cloudlet, ack);
return false;
}
submitCloudletToVm(cloudlet, ack);
return true;
}
throw new InvalidEventDataTypeException(evt, "CLOUDLET_SUBMIT Tags", Cloudlet.class.getName());
}
/**
* Submits a cloudlet to be executed inside its bind VM.
*
* @param cloudlet the cloudlet to the executed
* @param ack indicates if the Broker is waiting for an ACK after the Datacenter
* receives the cloudlet submission
*/
private void submitCloudletToVm(final Cloudlet cloudlet, final boolean ack) {
final double fileTransferTime = getDatacenterStorage().predictFileTransferTime(cloudlet.getRequiredFiles());
final var scheduler = cloudlet.getVm().getCloudletScheduler();
final double estimatedFinishTime = scheduler.cloudletSubmit(cloudlet, fileTransferTime);
// if this cloudlet is in the exec queue
if (estimatedFinishTime > 0.0 && !Double.isInfinite(estimatedFinishTime)) {
send(this,
getCloudletProcessingUpdateInterval(estimatedFinishTime),
CloudSimTag.VM_UPDATE_CLOUDLET_PROCESSING);
}
((CustomerEntityAbstract)cloudlet).setCreationTime();
sendCloudletSubmitAckToBroker(cloudlet, ack);
}
/**
* Gets the time when the next update of cloudlets has to be performed.
* This is the minimum value between the {@link #getSchedulingInterval()} and the given time
* (if the scheduling interval is enabled, i.e. if it's greater than 0),
* which represents when the next update of Cloudlets processing
* has to be performed.
*
* @param nextFinishingCloudletTime the predicted completion time of the earliest finishing cloudlet
* (which is a relative delay from the current simulation time),
* or {@link Double#MAX_VALUE} if there is no next Cloudlet to execute
* @return next time cloudlets processing will be updated (a relative delay from the current simulation time)
*
* @see #updateCloudletProcessing()
*/
protected double getCloudletProcessingUpdateInterval(final double nextFinishingCloudletTime){
if(schedulingInterval == 0) {
return nextFinishingCloudletTime;
}
final double time = Math.floor(clock());
final double mod = time % schedulingInterval;
/* If a scheduling interval is set, ensures the next time that Cloudlets' processing
* are updated is multiple of the scheduling interval.
* If there is an event happening before such a time, then the event
* will be scheduled as usual. Otherwise, the update
* is scheduled to the next time multiple of the scheduling interval.*/
final double delay = mod == 0 ? schedulingInterval : (time - mod + schedulingInterval) - time;
return Math.min(nextFinishingCloudletTime, delay);
}
private double clock() {
return getSimulation().clock();
}
/**
* Processes a Cloudlet resume request.
* @param cloudlet cloudlet to be resumed
* @param ack indicates if the event's sender expects to receive an
* @return
*/
protected boolean processCloudletResume(final Cloudlet cloudlet, final boolean ack) {
final double estimatedFinishTime = cloudlet.getVm().getCloudletScheduler().cloudletResume(cloudlet);
if (estimatedFinishTime > 0.0 && estimatedFinishTime > clock()) {
schedule(this,
getCloudletProcessingUpdateInterval(estimatedFinishTime),
CloudSimTag.VM_UPDATE_CLOUDLET_PROCESSING);
}
sendAck(ack, cloudlet, CloudSimTag.CLOUDLET_RESUME_ACK);
return true;
}
private void sendAck(final boolean ack, final Cloudlet cloudlet, final CloudSimTag tag) {
if (ack) {
sendNow(cloudlet.getBroker(), tag, cloudlet);
}
}
/**
* Processes a Cloudlet pause request.
* @param cloudlet cloudlet to be paused
* @param ack indicates if the event's sender expects to receive an
* @return
*/
protected boolean processCloudletPause(final Cloudlet cloudlet, final boolean ack) {
cloudlet.getVm().getCloudletScheduler().cloudletPause(cloudlet);
sendAck(ack, cloudlet, CloudSimTag.CLOUDLET_PAUSE_ACK);
return true;
}
/**
* Processes a Cloudlet cancel request.
*
* @param cloudlet cloudlet to be canceled
* @return
*/
protected boolean processCloudletCancel(final Cloudlet cloudlet) {
cloudlet.getVm().getCloudletScheduler().cloudletCancel(cloudlet);
sendNow(cloudlet.getBroker(), CloudSimTag.CLOUDLET_CANCEL, cloudlet);
return true;
}
/**
* Process the event for a Broker which wants to create a VM in this
* Datacenter. This Datacenter will then send the status back to
* the Broker.
*
* @param evt information about the event just happened
* acknowledge message when the event finishes to be processed
* @return true if a host was allocated to the VM; false otherwise
*/
private boolean processVmCreate(final SimEvent evt) {
if(evt.getData() instanceof Vm vm){
final boolean hostAllocatedForVm = vmAllocationPolicy.allocateHostForVm(vm).fully();
if (hostAllocatedForVm) {
vm.updateProcessing(vm.getHost().getVmScheduler().getAllocatedMips(vm));
}
/* Acknowledges that the request was received by the Datacenter,
(the broker is expecting that if the Vm was created or not). */
send(vm.getBroker(), getSimulation().getMinTimeBetweenEvents(), CloudSimTag.VM_CREATE_ACK, vm);
return hostAllocatedForVm;
}
throw new InvalidEventDataTypeException(evt, "VM_CREATE Tags", Vm.class.getName());
}
/**
* Process the event sent by a Broker, requesting the destruction of a given VM
* created in this Datacenter. This Datacenter may send,
* upon request, the status back to the Broker.
*
* @param evt information about the event just happened
* @param ack indicates if the event's sender expects to receive an
* @return
*/
protected boolean processVmDestroy(final SimEvent evt, final boolean ack) {
if(evt.getData() instanceof Vm vm){
vmAllocationPolicy.deallocateHostForVm(vm);
if (ack) {
sendNow(vm.getBroker(), CloudSimTag.VM_DESTROY_ACK, vm);
}
vm.getBroker().requestShutdownWhenIdle();
if(getSimulation().isAborted() || getSimulation().isAbortRequested()) {
return true;
}
final String warningMsg = generateNotFinishedCloudletsWarning(vm);
final String msg =
"%s: %s: %s destroyed on %s. %s"
.formatted(getSimulation().clockStr(), getClass().getSimpleName(), vm, vm.getHost(), warningMsg);
if(warningMsg.isEmpty() || getSimulation().isTerminationTimeSet())
LOGGER.info(msg);
else LOGGER.warn(msg);
return true;
}
throw new InvalidEventDataTypeException(evt, "VM_DESTROY Tags", Vm.class.getName());
}
private String generateNotFinishedCloudletsWarning(final Vm vm) {
final int cloudletsNoFinished = vm.getCloudletScheduler().getCloudletList().size();
if(cloudletsNoFinished == 0) {
return "";
}
final var options =
"""
Some events may have been missed. You can try:
(a) decreasing CloudSim's minTimeBetweenEvents and/or Datacenter's schedulingInterval attribute;
(b) increasing broker's Vm destruction delay for idle VMs if you set it to zero;
(c) defining Cloudlets with smaller length (your Datacenter's scheduling interval may be smaller than the time to finish some Cloudlets).
""";
return "It had a total of %d cloudlets (running + waiting). %s".formatted(cloudletsNoFinished, options);
}
/**
* Finishes the process of migrating a VM.
*
* @param evt information about the event just happened
* @param ack indicates if the event's sender expects to receive an
* acknowledgement message when the event finishes being processed
* @see CloudSimTag#VM_MIGRATE
* @return
*/
protected boolean finishVmMigration(final SimEvent evt, final boolean ack) {
if (!(evt.getData() instanceof Map.Entry)) {
throw new InvalidEventDataTypeException(evt, "VM_MIGRATE", "Map.Entry");
}
final var entry = (Map.Entry) evt.getData();
final Vm vm = entry.getKey();
final Host sourceHost = vm.getHost();
final Host targetHost = entry.getValue();
//Updates processing of all Hosts to get their latest state before migrating VMs
updateHostsProcessing();
//De-allocates the VM on the source Host (where it is migrating out)
vmAllocationPolicy.deallocateHostForVm(vm);
targetHost.removeMigratingInVm(vm);
final HostSuitability suitability = vmAllocationPolicy.allocateHostForVm(vm, targetHost);
if(suitability.fully()) {
((VmSimple)vm).updateMigrationFinishListeners(targetHost);
/*When the VM is destroyed from the source host, it's removed from the vmExecList.
After migration, we need to add it again.*/
vm.getBroker().getVmExecList().add(vm);
if (ack) {
sendNow(evt.getSource(), CloudSimTag.VM_CREATE_ACK, vm);
}
}
final var event = getSimulation().findFirstDeferred(this, new PredicateType(CloudSimTag.VM_MIGRATE));
if (event == null || event.getTime() > clock()) {
//Updates processing of all Hosts again to get their latest state after the VMs migrations
updateHostsProcessing();
}
if (suitability.fully())
LOGGER.info("{}: Migration of {} from {} to {} is completed.", getSimulation().clockStr(), vm, sourceHost, targetHost);
else LOGGER.error(
"{}: {}: Allocation of {} to the destination {} failed due to {}!",
getSimulation().clockStr(), this, vm, targetHost, suitability);
onVmMigrationFinishListeners.forEach(listener -> listener.update(DatacenterVmMigrationEventInfo.of(listener, vm, suitability)));
return true;
}
/**
* Checks if a submitted cloudlet has already finished.
* If it is the case, the Datacenter notifies the Broker that
* the Cloudlet cannot be created again because it has already finished.
*
* @param cloudlet the finished cloudlet
* @param ack indicates if the Broker is waiting for an ACK after the Datacenter
* receives the cloudlet submission
*/
private void notifyBrokerAboutAlreadyFinishedCloudlet(final Cloudlet cloudlet, final boolean ack) {
LOGGER.warn(
"{}: {} owned by {} is already completed/finished. It won't be executed again.",
getName(), cloudlet, cloudlet.getBroker());
/*
NOTE: If a Cloudlet has finished, then it won't be processed.
So, if ack is required, this method sends back a result.
If ack is not required, this method don't send back a result.
Hence, this might cause CloudSimPlus to be hanged since waiting
for this Cloudlet back.
*/
sendCloudletSubmitAckToBroker(cloudlet, ack);
sendNow(cloudlet.getBroker(), CloudSimTag.CLOUDLET_RETURN, cloudlet);
}
/**
* Sends an ACK to the DatacenterBroker that submitted the Cloudlet for execution
* in order to respond the reception of the submission request,
* informing if the cloudlet was created or not.
*
* The ACK is sent just if the Broker is waiting for it and that condition
* is indicated in the ack parameter.
*
* @param cloudlet the cloudlet to respond to DatacenterBroker if it was created or not
* @param ack indicates if the Broker is waiting for an ACK after the Datacenter
* receives the cloudlet submission
*/
private void sendCloudletSubmitAckToBroker(final Cloudlet cloudlet, final boolean ack) {
if (ack) {
sendNow(cloudlet.getBroker(), CloudSimTag.CLOUDLET_SUBMIT_ACK, cloudlet);
}
}
/**
* Updates the processing of all Hosts, meaning
* it makes the processing of VMs running inside such hosts to be updated.
* Finally, the processing of Cloudlets running inside such VMs is updated too.
*
* @return the predicted completion time of the earliest finishing cloudlet
* (which is a relative delay from the current simulation time),
* or {@link Double#MAX_VALUE} if there is no next Cloudlet to execute
*/
protected double updateHostsProcessing() {
double nextSimulationDelay = Double.MAX_VALUE;
for (final Host host : getHostList()) {
final double delay = host.updateProcessing(clock());
nextSimulationDelay = Math.min(delay, nextSimulationDelay);
}
// Guarantees a minimal interval before scheduling the event
final double minTimeBetweenEvents = getSimulation().getMinTimeBetweenEvents()+0.01;
nextSimulationDelay = nextSimulationDelay == 0 ? nextSimulationDelay : Math.max(nextSimulationDelay, minTimeBetweenEvents);
return nextSimulationDelay;
}
/**
* Updates processing of each Host, that fires the update of VMs,
* which in turn updates cloudlets running in this Datacenter.
* After that, the method schedules the next processing update.
* It is necessary because Hosts and VMs are simple objects, not
* entities. So, they don't receive events and updating cloudlets inside
* them must be called from the outside.
*
* @return the predicted completion time of the earliest finishing cloudlet
* (which is a relative delay from the current simulation time),
* or {@link Double#MAX_VALUE} if there is no next Cloudlet to execute
* or it isn't time to update the cloudlets
*/
protected double updateCloudletProcessing() {
if (!isTimeToUpdateCloudletsProcessing()){
return Double.MAX_VALUE;
}
double nextSimulationDelay = updateHostsProcessing();
if (nextSimulationDelay != Double.MAX_VALUE) {
nextSimulationDelay = getCloudletProcessingUpdateInterval(nextSimulationDelay);
schedule(nextSimulationDelay, CloudSimTag.VM_UPDATE_CLOUDLET_PROCESSING);
}
setLastProcessTime(clock());
checkIfVmMigrationsAreNeeded();
return nextSimulationDelay;
}
private boolean isTimeToUpdateCloudletsProcessing() {
// if some time passed since last processing
// R: for term is to allow loop at simulation start. Otherwise, one initial
// simulation step is skipped and schedulers are not properly initialized
return clock() < 0.111 ||
clock() >= lastProcessTime + getSimulation().getMinTimeBetweenEvents();
}
/**
* Checks if the {@link #getVmAllocationPolicy()} has defined
* a new VM placement map, then sends the request to migrate VMs.
*
* This is an expensive operation for large scale simulations.
*/
private void checkIfVmMigrationsAreNeeded() {
if (!isTimeToSearchForSuitableHosts()) {
return;
}
lastMigrationMap = vmAllocationPolicy.getOptimizedAllocationMap(getVmList());
for (final Map.Entry entry : lastMigrationMap.entrySet()) {
requestVmMigration(entry.getKey(), entry.getValue());
}
if(areThereUnderOrOverloadedHostsAndMigrationIsSupported()){
lastUnderOrOverloadedDetection = clock();
}
}
/**
* Indicates if it's time to check if suitable Hosts are available to migrate VMs
* from under or overload Hosts.
* @return
*/
private boolean isTimeToSearchForSuitableHosts(){
final double elapsedSecs = clock() - lastUnderOrOverloadedDetection;
return isMigrationsEnabled() && elapsedSecs >= hostSearchRetryDelay;
}
private boolean areThereUnderOrOverloadedHostsAndMigrationIsSupported(){
if(vmAllocationPolicy instanceof VmAllocationPolicyMigration migrationPolicy){
return migrationPolicy.isUnderOrOverloaded();
}
return false;
}
@Override
public void requestVmMigration(final Vm sourceVm) {
requestVmMigration(sourceVm, Host.NULL);
}
@Override
public void requestVmMigration(final Vm sourceVm, Host targetHost) {
//If Host.NULL is given, it must try to find a target host
if(Host.NULL.equals(targetHost)){
targetHost = vmAllocationPolicy.findHostForVm(sourceVm).orElse(Host.NULL);
}
//If a host couldn't be found yet
if(Host.NULL.equals(targetHost)) {
LOGGER.warn("{}: {}: No suitable host found for {} in {}", sourceVm.getSimulation().clockStr(), getClass().getSimpleName(), sourceVm, this);
return;
}
final var sourceHost = sourceVm.getHost();
final double delay = timeToMigrateVm(sourceVm, targetHost);
final String msg1 =
Host.NULL.equals(sourceHost) ?
"%s to %s".formatted(sourceVm, targetHost) :
"%s from %s to %s".formatted(sourceVm, sourceHost, targetHost);
final String currentTime = getSimulation().clockStr();
final var fmt = "It's expected to finish in %.2f seconds, considering the %.0f%% of bandwidth allowed for migration and the VM RAM size.";
final String msg2 = fmt.formatted(delay, getBandwidthPercentForMigration()*100);
LOGGER.info("{}: {}: Migration of {} is started. {}", currentTime, getName(), msg1, msg2);
if(targetHost.addMigratingInVm(sourceVm)) {
sourceHost.addVmMigratingOut(sourceVm);
send(this, delay, CloudSimTag.VM_MIGRATE, new TreeMap.SimpleEntry<>(sourceVm, targetHost));
}
}
/**
* Computes the expected time to migrate a VM to a given Host.
* It is computed as: VM RAM (MB)/Target Host Bandwidth (Mb/s).
*
* @param vm the VM to migrate.
* @param targetHost the Host where tto migrate the VM
* @return the time (in seconds) that is expected to migrate the VM
*/
private double timeToMigrateVm(final Vm vm, final Host targetHost) {
return vm.getRam().getCapacity() / bitsToBytes(targetHost.getBw().getCapacity() * getBandwidthPercentForMigration());
}
@Override
public void shutdown() {
super.shutdown();
LOGGER.info("{}: {} is shutting down...", getSimulation().clockStr(), getName());
}
@Override
protected void startInternal() {
LOGGER.info("{}: {} is starting...", getSimulation().clockStr(), getName());
hostList.stream()
.filter(not(Host::isActive))
.map(host -> (HostSimple)host)
.forEach(host -> host.setActive(host.isActivateOnDatacenterStartup()));
sendNow(getSimulation().getCis(), CloudSimTag.DC_REGISTRATION_REQUEST, this);
}
@Override
public List getHostList() {
return (List)Collections.unmodifiableList(hostList);
}
@Override
public Stream getActiveHostStream() {
return hostList.stream().filter(Host::isActive);
}
/**
* Sets the policy to be used by the Datacenter to allocate VMs into hosts.
*
* @param vmAllocationPolicy the new vm allocation policy
*/
public final Datacenter setVmAllocationPolicy(final VmAllocationPolicy vmAllocationPolicy) {
requireNonNull(vmAllocationPolicy);
if(vmAllocationPolicy.getDatacenter() != null && vmAllocationPolicy.getDatacenter() != Datacenter.NULL && !this.equals(vmAllocationPolicy.getDatacenter())){
throw new IllegalStateException("The given VmAllocationPolicy is already used by another Datacenter.");
}
vmAllocationPolicy.setDatacenter(this);
this.vmAllocationPolicy = vmAllocationPolicy;
return this;
}
@Override
public final void setDatacenterStorage(final DatacenterStorage datacenterStorage) {
datacenterStorage.setDatacenter(this);
this.datacenterStorage = datacenterStorage;
}
/**
* Gets a read-only list all VMs from all Hosts of this Datacenter.
*
* @param the class of VMs inside the list
* @return the list all VMs from all Hosts
*/
private List getVmList() {
return (List) Collections.unmodifiableList(
getHostList()
.stream()
.map(Host::getVmList)
.flatMap(List::stream)
.collect(toList()));
}
@Override
public final Datacenter setSchedulingInterval(final double schedulingInterval) {
this.schedulingInterval = Math.max(schedulingInterval, 0);
return this;
}
@Override
public final Datacenter setTimeZone(final double timeZone) {
this.timeZone = validateTimeZone(timeZone);
return this;
}
@Override
public Host getHost(final int index) {
if (index >= 0 && index < getHostList().size()) {
return getHostList().get(index);
}
return Host.NULL;
}
/**
* Update the number of active Hosts inside the datacenter
*/
public void updateActiveHostsNumber(final Host host){
activeHostsNumber += host.isActive() ? 1 : -1;
}
@Override
public long size() {
return hostList.size();
}
@Override
public Host getHostById(final long id) {
return hostList.stream().filter(host -> host.getId() == id).findFirst().map(host -> (Host)host).orElse(Host.NULL);
}
@Override
public Datacenter addHostList(final List hostList) {
requireNonNull(hostList);
hostList.forEach(this::addHost);
return this;
}
@Override
public Datacenter addHost(final T host) {
if(vmAllocationPolicy == null || vmAllocationPolicy == VmAllocationPolicy.NULL){
throw new IllegalStateException("A VmAllocationPolicy must be set before adding a new Host to the Datacenter.");
}
setupHost(host, getLastHostId());
((List)hostList).add(host);
return this;
}
private void notifyOnHostAvailableListeners(final T host) {
onHostAvailableListeners.forEach(listener -> listener.update(HostEventInfo.of(listener, host, clock())));
}
@Override
public Datacenter removeHost(final T host) {
hostList.remove(host);
return this;
}
@Override
public String toString() {
return "Datacenter %d".formatted(getId());
}
@Override
public void setBandwidthPercentForMigration(final double bandwidthPercentForMigration) {
if(bandwidthPercentForMigration <= 0){
throw new IllegalArgumentException("The bandwidth migration percentage must be greater than 0.");
}
if(bandwidthPercentForMigration > 1){
throw new IllegalArgumentException("The bandwidth migration percentage must be lower or equal to 1.");
}
this.bandwidthPercentForMigration = bandwidthPercentForMigration;
}
@Override
public Datacenter addOnHostAvailableListener(final EventListener listener) {
onHostAvailableListeners.add(requireNonNull(listener));
return this;
}
@Override
public Datacenter addOnVmMigrationFinishListener(final EventListener listener) {
onVmMigrationFinishListeners.add(requireNonNull(listener));
return this;
}
@Override
public boolean isMigrationsEnabled() {
return migrationsEnabled && vmAllocationPolicy.isVmMigrationSupported();
}
@Override
public final Datacenter enableMigrations() {
if(!vmAllocationPolicy.isVmMigrationSupported()){
LOGGER.warn(
"{}: {}: It was requested to enable VM migrations but the {} doesn't support that.",
getSimulation().clockStr(), getName(), vmAllocationPolicy.getClass().getSimpleName());
return this;
}
this.migrationsEnabled = true;
return this;
}
@Override
public final Datacenter disableMigrations() {
this.migrationsEnabled = false;
return this;
}
@Override
public final Datacenter setPowerModel(final PowerModelDatacenter powerModel) {
requireNonNull(powerModel,
"powerModel cannot be null. You could provide a " +
PowerModelDatacenter.class.getSimpleName() + ".NULL instead");
if(powerModel.getDatacenter() != null && powerModel.getDatacenter() != Datacenter.NULL && !this.equals(powerModel.getDatacenter())){
throw new IllegalStateException("The given PowerModel is already assigned to another Datacenter. Each Datacenter must have its own PowerModel instance.");
}
this.powerModel = powerModel;
return null;
}
@Override
public Datacenter setHostSearchRetryDelay(final double delay) {
if(delay == 0){
throw new IllegalArgumentException("hostSearchRetryDelay cannot be 0. Set a positive value to define an actual delay or a negative value to indicate a new Host search must be tried as soon as possible.");
}
this.hostSearchRetryDelay = delay;
return this;
}
@Override
public Datacenter setCharacteristics(@NonNull DatacenterCharacteristics c) {
((DatacenterCharacteristicsSimple)c).setDatacenter(this);
this.characteristics = c;
return this;
}
}
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