Package org.cloudbus.cloudsim.schedulers.cloudlet

Class CloudletSchedulerSpaceShared

java.lang.Object

org.cloudbus.cloudsim.schedulers.cloudlet.CloudletSchedulerAbstract

org.cloudbus.cloudsim.schedulers.cloudlet.CloudletSchedulerSpaceShared

All Implemented Interfaces:

Serializable, CloudletScheduler

public class CloudletSchedulerSpaceShared
extends CloudletSchedulerAbstract

Implements a policy of scheduling performed by a virtual machine to run its Cloudlets. It considers there will be only one Cloudlet per VM. Other Cloudlets will be in a waiting list. It also considers that the time to transfer Cloudlets to the Vm happens before Cloudlet starts executing. I.e., even though Cloudlets must wait for CPU, data transfer happens as soon as Cloudlets are submitted.

This scheduler does not consider Cloudlets priorities to define execution order. If actual priorities are defined for Cloudlets, they are just ignored by the scheduler.

Since:

CloudSim Toolkit 1.0

Author:

Rodrigo N. Calheiros, Anton Beloglazov, Manoel Campos da Silva Filho

See Also:

• Serialized Form

Field Summary

Fields inherited from interface org.cloudbus.cloudsim.schedulers.cloudlet.CloudletScheduler

LOGGER, NULL

Constructor Summary

Constructors

Constructor	Description
CloudletSchedulerSpaceShared()

Method Summary

Modifier and Type	Method	Description
protected boolean	canExecuteCloudletInternal(CloudletExecution cle)	The space-shared scheduler does not share the CPU time between executing cloudlets.
double	cloudletResume(Cloudlet cloudlet)	Resumes execution of a paused cloudlet.

Methods inherited from class org.cloudbus.cloudsim.schedulers.cloudlet.CloudletSchedulerAbstract

addCloudletToExecList, addCloudletToReturnedList, addCloudletToWaitingList, addOnCloudletResourceAllocationFail, addWaitingCloudletToExecList, clear, cloudletCancel, cloudletEstimatedFinishTime, cloudletFail, cloudletFinish, cloudletPause, cloudletReady, cloudletSubmit, cloudletSubmit, cloudletSubmitInternal, deallocatePesFromVm, enableCloudletSubmittedList, findCloudletInAllLists, findCloudletInList, findSuitableWaitingCloudlet, getAllocatedCpuPercent, getAllocatedMipsForCloudlet, getAllocatedMipsForCloudlet, getAvailableMipsByPe, getCloudletExecList, getCloudletFailedList, getCloudletFinishedList, getCloudletList, getCloudletPausedList, getCloudletReturnedList, getCloudletSubmittedList, getCloudletWaitingList, getCurrentMipsShare, getCurrentRequestedBwPercentUtilization, getCurrentRequestedRamPercentUtilization, getFreePes, getPreviousTime, getRequestedCpuPercent, getRequestedMipsForCloudlet, getTaskScheduler, getUsedPes, getVm, hasFinishedCloudlets, isEmpty, isThereEnoughFreePesForCloudlet, isThereTaskScheduler, moveNextCloudletsFromWaitingToExecList, removeCloudletFromExecList, removeOnCloudletResourceAllocationFail, setCurrentMipsShare, setPreviousTime, setTaskScheduler, setVm, sortCloudletWaitingList, timeSpan, updateCloudletProcessing, updateProcessing

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

CloudletSchedulerSpaceShared

public CloudletSchedulerSpaceShared()

Method Details

cloudletResume

public double cloudletResume(Cloudlet cloudlet)

Description copied from interface: CloudletScheduler

Resumes execution of a paused cloudlet.

Parameters:

cloudlet - the cloudlet being resumed

Returns:

expected finish time of the cloudlet, 0.0 if queued or not found in the paused list

canExecuteCloudletInternal

protected boolean canExecuteCloudletInternal(CloudletExecution cle)

The space-shared scheduler does not share the CPU time between executing cloudlets. Each CPU (Pe) is used by another Cloudlet just when the previous Cloudlet using it has finished executing completely. By this way, if there are more Cloudlets than PEs, some Cloudlet will not be allowed to start executing immediately.

Specified by:

canExecuteCloudletInternal in class CloudletSchedulerAbstract

Parameters:

cle -

Returns:

See Also:

• CloudletSchedulerAbstract.canExecuteCloudlet(CloudletExecution)