Package org.cloudbus.cloudsim.allocationpolicies.migration

Class VmAllocationPolicyMigrationBestFitStaticThreshold

java.lang.Object

org.cloudbus.cloudsim.allocationpolicies.VmAllocationPolicyAbstract

org.cloudbus.cloudsim.allocationpolicies.migration.VmAllocationPolicyMigrationAbstract

org.cloudbus.cloudsim.allocationpolicies.migration.VmAllocationPolicyMigrationStaticThreshold

org.cloudbus.cloudsim.allocationpolicies.migration.VmAllocationPolicyMigrationBestFitStaticThreshold

All Implemented Interfaces:

VmAllocationPolicyMigration, VmAllocationPolicy

public class VmAllocationPolicyMigrationBestFitStaticThreshold
extends VmAllocationPolicyMigrationStaticThreshold

A VmAllocationPolicy that uses a Static CPU utilization Threshold (THR) to detect host under and VmAllocationPolicyMigrationStaticThreshold.getOverUtilizationThreshold(Host) over} utilization.

It's a Best Fit policy which selects the Host having the most used amount of CPU MIPS to place a given VM, disregarding energy consumption.

Since:

CloudSim Plus 1.0

Author:

Anton Beloglazov, Manoel Campos da Silva Filho

Field Summary

Fields inherited from class org.cloudbus.cloudsim.allocationpolicies.migration.VmAllocationPolicyMigrationStaticThreshold

DEF_OVER_UTILIZATION_THRESHOLD

Fields inherited from class org.cloudbus.cloudsim.allocationpolicies.migration.VmAllocationPolicyMigrationAbstract

DEF_UNDERLOAD_THRESHOLD

Fields inherited from interface org.cloudbus.cloudsim.allocationpolicies.VmAllocationPolicy

DEF_HOST_COUNT_PARALLEL_SEARCH, LOGGER, NULL

Fields inherited from interface org.cloudbus.cloudsim.allocationpolicies.migration.VmAllocationPolicyMigration

NULL

Constructor Summary

Constructors

Constructor	Description
VmAllocationPolicyMigrationBestFitStaticThreshold(VmSelectionPolicy vmSelectionPolicy)	Creates a VmAllocationPolicyMigrationBestFitStaticThreshold.
VmAllocationPolicyMigrationBestFitStaticThreshold(VmSelectionPolicy vmSelectionPolicy, double overUtilizationThreshold)
VmAllocationPolicyMigrationBestFitStaticThreshold(VmSelectionPolicy vmSelectionPolicy, double overUtilizationThreshold, BiFunction<VmAllocationPolicy,Vm,Optional<Host>> findHostForVmFunction)	Creates a new VmAllocationPolicy, changing the Function to select a Host for a Vm.

Method Summary

Modifier and Type	Method	Description
protected Optional<Host>	findHostForVmInternal(Vm vm, Predicate<Host> predicate)	Gets the Host having the least available MIPS capacity (max used MIPS).

Methods inherited from class org.cloudbus.cloudsim.allocationpolicies.migration.VmAllocationPolicyMigrationStaticThreshold

getOverUtilizationThreshold, setOverUtilizationThreshold

Methods inherited from class org.cloudbus.cloudsim.allocationpolicies.migration.VmAllocationPolicyMigrationAbstract

areHostsOverloaded, areHostsUnderloaded, defaultFindHostForVm, getMaxUtilizationAfterAllocation, getOptimizedAllocationMap, getPowerAfterAllocation, getPowerDifferenceAfterAllocation, getSwitchedOffHosts, getUnderUtilizationThreshold, getUtilizationOfCpuMips, getVmSelectionPolicy, getVmsToMigrateFromUnderUtilizedHost, isHostOverloaded, isHostUnderloaded, isVmMigrationSupported, setDatacenter, setUnderUtilizationThreshold, setVmSelectionPolicy

Methods inherited from class org.cloudbus.cloudsim.allocationpolicies.VmAllocationPolicyAbstract

allocateHostForVm, allocateHostForVm, allocateHostForVm, deallocateHostForVm, findHostForVm, getDatacenter, getHostCountForParallelSearch, getHostList, scaleVmVertically, setFindHostForVmFunction, setHostCountForParallelSearch

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.cloudbus.cloudsim.allocationpolicies.VmAllocationPolicy

allocateHostForVm, allocateHostForVm, allocateHostForVm, deallocateHostForVm, findHostForVm, getDatacenter, getHostCountForParallelSearch, getHostList, isParallelHostSearchEnabled, scaleVmVertically, setFindHostForVmFunction, setHostCountForParallelSearch

Methods inherited from interface org.cloudbus.cloudsim.allocationpolicies.migration.VmAllocationPolicyMigration

areHostsUnderOrOverloaded

Constructor Details

VmAllocationPolicyMigrationBestFitStaticThreshold

public VmAllocationPolicyMigrationBestFitStaticThreshold(VmSelectionPolicy vmSelectionPolicy)

Creates a VmAllocationPolicyMigrationBestFitStaticThreshold. It uses a default over utilization threshold and a default under utilization threshold.

Parameters:

vmSelectionPolicy - the policy that defines how VMs are selected for migration

See Also:

• VmAllocationPolicyMigrationAbstract.setUnderUtilizationThreshold(double)
• VmAllocationPolicyMigrationStaticThreshold.setOverUtilizationThreshold(double)

VmAllocationPolicyMigrationBestFitStaticThreshold

public VmAllocationPolicyMigrationBestFitStaticThreshold(VmSelectionPolicy vmSelectionPolicy,
 double overUtilizationThreshold)

VmAllocationPolicyMigrationBestFitStaticThreshold

public VmAllocationPolicyMigrationBestFitStaticThreshold(VmSelectionPolicy vmSelectionPolicy,
 double overUtilizationThreshold,
 BiFunction<VmAllocationPolicy,Vm,Optional<Host>> findHostForVmFunction)

Creates a new VmAllocationPolicy, changing the Function to select a Host for a Vm.

Parameters:

vmSelectionPolicy - the policy that defines how VMs are selected for migration

overUtilizationThreshold - the over utilization threshold

findHostForVmFunction - a Function to select a Host for a given Vm. Passing null makes the Function to be set as the default VmAllocationPolicyAbstract.findHostForVm(Vm).

See Also:

• VmAllocationPolicy.setFindHostForVmFunction(java.util.function.BiFunction)

Method Details

findHostForVmInternal

protected Optional<Host> findHostForVmInternal(Vm vm,
 Predicate<Host> predicate)

Gets the Host having the least available MIPS capacity (max used MIPS).

This method is ignoring the additional filtering performed by the super class. This way, Host selection is performed ignoring energy consumption. However, all the basic filters defined in the super class are ensured, since this method is called just after they are applied.

Overrides:

findHostForVmInternal in class VmAllocationPolicyMigrationAbstract

Parameters:

vm - the VM to find a Host to be placed into

predicate - a Predicate to filter suitable Hosts

Returns:

an Optional containing a suitable Host to place the VM or an empty Optional if not found

See Also:

• VmAllocationPolicyMigrationAbstract.findHostForVm(Vm, Predicate)