org.cloudbus.cloudsim

Class VmSchedulerTimeSharedOverSubscription

java.lang.Object

org.cloudbus.cloudsim.VmScheduler

org.cloudbus.cloudsim.VmSchedulerTimeShared

org.cloudbus.cloudsim.VmSchedulerTimeSharedOverSubscription

public class VmSchedulerTimeSharedOverSubscription
extends VmSchedulerTimeShared

This is a Time-Shared VM Scheduler, which allows over-subscription. In other words, the scheduler still allows the allocation of VMs that require more CPU capacity that is available. Oversubscription results in performance degradation.

Since:

CloudSim Toolkit 3.0

Author:

Anton Beloglazov, Rodrigo N. Calheiros

Constructor Summary

Constructors

Constructor and Description
VmSchedulerTimeSharedOverSubscription(List<? extends Pe> pelist) Instantiates a new vm scheduler time shared over subscription.

Method Summary

Methods

Modifier and Type	Method and Description
protected boolean	allocatePesForVm(String vmUid, List<Double> mipsShareRequested) Allocate pes for vm.
protected void	redistributeMipsDueToOverSubscription() This method recalculates distribution of MIPs among VMs considering eventual shortage of MIPS compared to the amount requested by VMs.

Methods inherited from class org.cloudbus.cloudsim.VmSchedulerTimeShared

allocatePesForVm, deallocatePesForAllVms, deallocatePesForVm, getMaxAvailableMips, getMipsMapRequested, getPesInUse, setMipsMapRequested, setPesInUse, updatePeProvisioning

Methods inherited from class org.cloudbus.cloudsim.VmScheduler

getAllocatedMipsForVm, getAvailableMips, getMipsMap, getPeCapacity, getPeList, getPeMap, getPesAllocatedForVM, getTotalAllocatedMipsForVm, getVmsMigratingIn, getVmsMigratingOut, setAvailableMips, setMipsMap, setPeList, setPeMap, setVmsMigratingIn, setVmsMigratingOut

Methods inherited from class java.lang.Object

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

Constructor Detail

VmSchedulerTimeSharedOverSubscription

public VmSchedulerTimeSharedOverSubscription(List<? extends Pe> pelist)

Instantiates a new vm scheduler time shared over subscription.

Parameters:

pelist - the pelist

Method Detail

allocatePesForVm

protected boolean allocatePesForVm(String vmUid,
                       List<Double> mipsShareRequested)

Allocate pes for vm. The policy allows over-subscription. In other words, the policy still allows the allocation of VMs that require more CPU capacity that is available. Oversubscription results in performance degradation. Each virtual PE cannot be allocated more CPU capacity than MIPS of a single PE.

Overrides:

allocatePesForVm in class VmSchedulerTimeShared

Parameters:

vmUid - the vm uid

mipsShareRequested - the mips share requested

Returns:

true, if successful

redistributeMipsDueToOverSubscription

protected void redistributeMipsDueToOverSubscription()

This method recalculates distribution of MIPs among VMs considering eventual shortage of MIPS compared to the amount requested by VMs.