Package org.cloudbus.cloudsim.allocationpolicies.migration

Interface VmAllocationPolicyMigration

All Superinterfaces:

VmAllocationPolicy

All Known Subinterfaces:

VmAllocationPolicyMigrationDynamicUpperThreshold

All Known Implementing Classes:

VmAllocationPolicyMigrationAbstract, VmAllocationPolicyMigrationBestFitStaticThreshold, VmAllocationPolicyMigrationDynamicUpperThresholdFirstFit, VmAllocationPolicyMigrationFirstFitStaticThreshold, VmAllocationPolicyMigrationStaticThreshold, VmAllocationPolicyMigrationWorstFitStaticThreshold

public interface VmAllocationPolicyMigration
extends VmAllocationPolicy

An interface to be implemented by a VM allocation policy that detects Host under and over CPU utilization.

Since:

CloudSim Plus 1.0

Author:

Anton Beloglazov, Manoel Campos da Silva Filho

Field Summary

Fields

Modifier and Type	Field	Description
static final VmAllocationPolicyMigration	NULL	An attribute that implements the Null Object Design Pattern for VmAllocationPolicyMigration objects.

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

DEF_HOST_COUNT_PARALLEL_SEARCH, LOGGER

Method Summary

Modifier and Type	Method	Description
boolean	areHostsOverloaded()	Checks if there are some Hosts overloaded.
boolean	areHostsUnderloaded()	Checks if there are some Hosts underloaded.
default boolean	areHostsUnderOrOverloaded()	Checks if there are some Hosts either under or overloaded.
double	getOverUtilizationThreshold(Host host)	Gets the host CPU utilization threshold to detect over utilization.
double	getUnderUtilizationThreshold()	Gets the percentage of total CPU utilization to indicate that a host is under used and its VMs have to be migrated.
VmSelectionPolicy	getVmSelectionPolicy()	Gets the the policy that defines how VMs are selected for migration.
boolean	isHostOverloaded(Host host)	Checks if host is currently over utilized, according the conditions defined by the Allocation Policy.
boolean	isHostUnderloaded(Host host)	Checks if host is currently under utilized, according the conditions defined by the Allocation Policy.
void	setUnderUtilizationThreshold(double underUtilizationThreshold)	Sets the percentage of total CPU utilization to indicate that a host is under used and its VMs have to be migrated.
void	setVmSelectionPolicy(VmSelectionPolicy vmSelectionPolicy)	Sets the the policy that defines how VMs are selected for migration.

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

allocateHostForVm, allocateHostForVm, allocateHostForVm, deallocateHostForVm, findHostForVm, getDatacenter, getHostCountForParallelSearch, getHostList, getOptimizedAllocationMap, isParallelHostSearchEnabled, isVmMigrationSupported, scaleVmVertically, setDatacenter, setFindHostForVmFunction, setHostCountForParallelSearch

Field Details

NULL

static final VmAllocationPolicyMigration NULL

An attribute that implements the Null Object Design Pattern for VmAllocationPolicyMigration objects.

Method Details

isHostUnderloaded

boolean isHostUnderloaded(Host host)

Checks if host is currently under utilized, according the conditions defined by the Allocation Policy.

Parameters:

host - the host

Returns:

true, if the host is under utilized; false otherwise

isHostOverloaded

boolean isHostOverloaded(Host host)

Checks if host is currently over utilized, according the conditions defined by the Allocation Policy.

Parameters:

host - the host to check

Returns:

true, if the host is over utilized; false otherwise

getOverUtilizationThreshold

double getOverUtilizationThreshold(Host host)

Gets the host CPU utilization threshold to detect over utilization. It is a percentage value from 0 to 1. Whether it is a static or dynamically defined threshold depends on each implementing class.

Parameters:

host - the host to get the over utilization threshold

Returns:

the over utilization threshold

setVmSelectionPolicy

void setVmSelectionPolicy(VmSelectionPolicy vmSelectionPolicy)

Sets the the policy that defines how VMs are selected for migration.

Parameters:

vmSelectionPolicy - the new vm selection policy

getVmSelectionPolicy

VmSelectionPolicy getVmSelectionPolicy()

Gets the the policy that defines how VMs are selected for migration.

Returns:

the VmSelectionPolicy.

getUnderUtilizationThreshold

double getUnderUtilizationThreshold()

Gets the percentage of total CPU utilization to indicate that a host is under used and its VMs have to be migrated.

Returns:

the under utilization threshold (in scale is from 0 to 1, where 1 is 100%)

setUnderUtilizationThreshold

void setUnderUtilizationThreshold(double underUtilizationThreshold)

Sets the percentage of total CPU utilization to indicate that a host is under used and its VMs have to be migrated.

Parameters:

underUtilizationThreshold - the under utilization threshold (in scale is from 0 to 1, where 1 is 100%)

areHostsUnderloaded

boolean areHostsUnderloaded()

Checks if there are some Hosts underloaded.

Returns:

areHostsOverloaded

boolean areHostsOverloaded()

Checks if there are some Hosts overloaded.

Returns:

areHostsUnderOrOverloaded

default boolean areHostsUnderOrOverloaded()

Checks if there are some Hosts either under or overloaded.

Returns: