Class VmSchedulerAbstract
java.lang.Object
org.cloudbus.cloudsim.schedulers.vm.VmSchedulerAbstract
- All Implemented Interfaces:
VmScheduler
- Direct Known Subclasses:
VmSchedulerSpaceShared
,VmSchedulerTimeShared
An abstract class for implementation of
VmScheduler
s.- Since:
- CloudSim Toolkit 1.0
- Author:
- Rodrigo N. Calheiros, Anton Beloglazov, Manoel Campos da Silva Filho
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Field Summary
Fields inherited from interface org.cloudbus.cloudsim.schedulers.vm.VmScheduler
DEF_VM_MIGRATION_CPU_OVERHEAD, LOGGER, NULL
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Constructor Summary
ConstructorDescriptionVmSchedulerAbstract
(double vmMigrationCpuOverhead) Creates a VmScheduler, defining a CPU overhead for VM migration. -
Method Summary
Modifier and TypeMethodDescriptionfinal boolean
allocatePesForVm
(Vm vm) Requests the allocation of PEs for a VM, according to the number of PEs and MIPS defined by VM attributes.final boolean
allocatePesForVm
(Vm vm, MipsShare requestedMips) Requests the allocation of PEs for a VM.protected abstract boolean
allocatePesForVmInternal
(Vm vm, MipsShare mipsShareRequested) void
Releases all PEs allocated to a VM.void
deallocatePesFromVm
(Vm vm, int pesToRemove) Releases a given number of PEs from a VM.protected abstract long
deallocatePesFromVmInternal
(Vm vm, int pesToRemove) getAllocatedMips
(Vm vm) Gets the MIPS share of each host's Pe that is allocated to a given VM.getHost()
Gets the host that the VmScheduler get the list of PEs to allocate to VMs.double
Gets the max percentage of CPU a VM migrating out of this Host can use.protected MipsShare
getMipsShareRequestedReduced
(Vm vm, MipsShare mipsShareRequested) Gets an adjusted List of MIPS requested by a VM, reducing every MIPS which is higher than thecapacity of each physical PE
to that value.long
Gets PE capacity in MIPS.getRequestedMips
(Vm vm) Gets the List of MIPS requested by a VM.double
Gets the actual total allocated MIPS for a VM along all its allocated PEs.double
Gets the total amount of MIPS that is currently free.double
Defines the percentage of Host's CPU usage increase when a VM is migrating in or out of the Host.Gets the list of working PEs from the Host, which excludes failed PEs.final boolean
isSuitableForVm
(Vm vm) Checks if the PM using this scheduler has enough MIPS capacity to host a given VM.final boolean
isSuitableForVm
(Vm vm, MipsShare requestedMips) Checks if a list of MIPS requested by a VM is allowed to be allocated or not.protected abstract boolean
isSuitableForVmInternal
(Vm vm, MipsShare requestedMips) protected double
Gets the percentage of the MIPS requested by a VM that will be in fact requested to the Host, according to the VM migration status: VM is migrating out of this Host: the MIPS requested by VM will be reduced according to theCPU migration overhead
.protected final long
removePesFromVm
(Vm vm, MipsShare mipsShare, long pesToRemove) Tries to remove a given number of PEs allocated to a VMfinal VmScheduler
Sets the host that the VmScheduler get the list of PEs to allocate to VMs.
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Constructor Details
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VmSchedulerAbstract
public VmSchedulerAbstract(double vmMigrationCpuOverhead) Creates a VmScheduler, defining a CPU overhead for VM migration.- Parameters:
vmMigrationCpuOverhead
- the percentage of Host's CPU usage increase when a VM is migrating in or out of the Host. The value is in scale from 0 to 1 (where 1 is 100%).
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Method Details
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isSuitableForVm
Description copied from interface:VmScheduler
Checks if the PM using this scheduler has enough MIPS capacity to host a given VM.- Specified by:
isSuitableForVm
in interfaceVmScheduler
- Parameters:
vm
- the vm to check if there is enough available resource on the PM to host it- Returns:
- true, if it is possible to allocate the the VM into the host; false otherwise
- See Also:
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allocatePesForVm
Description copied from interface:VmScheduler
Requests the allocation of PEs for a VM, according to the number of PEs and MIPS defined by VM attributes.- Specified by:
allocatePesForVm
in interfaceVmScheduler
- Parameters:
vm
- the vm to allocate PEs to- Returns:
- true if the PEs were allocated to the VM, false otherwise
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deallocatePesFromVm
Description copied from interface:VmScheduler
Releases all PEs allocated to a VM. After that, the PEs may be used on demand by other VMs.- Specified by:
deallocatePesFromVm
in interfaceVmScheduler
- Parameters:
vm
- the vm to deallocate PEs from
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deallocatePesFromVm
Description copied from interface:VmScheduler
Releases a given number of PEs from a VM. After that, the PEs may be used on demand by other VMs.- Specified by:
deallocatePesFromVm
in interfaceVmScheduler
- Parameters:
vm
- the vm to deallocate PEs frompesToRemove
- number of PEs to deallocate
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deallocatePesFromVmInternal
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getAllocatedMips
Description copied from interface:VmScheduler
Gets the MIPS share of each host's Pe that is allocated to a given VM.- Specified by:
getAllocatedMips
in interfaceVmScheduler
- Parameters:
vm
- the vm to get the MIPS share- Returns:
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getTotalAllocatedMipsForVm
Description copied from interface:VmScheduler
Gets the actual total allocated MIPS for a VM along all its allocated PEs. If the VM is migrating into the Host, then just a fraction of the requested MIPS is actually allocated, representing the overhead of the migration process.The MIPS requested by the VM are just actually allocated after the migration is completed.
- Specified by:
getTotalAllocatedMipsForVm
in interfaceVmScheduler
- Parameters:
vm
- the VM to get the total allocated MIPS- Returns:
- See Also:
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getPeCapacity
public long getPeCapacity()Gets PE capacity in MIPS.- Returns:
- To do something:
- It considers that all PEs have the same capacity, what has been shown doesn't be assured. The peList received by the VmScheduler can be heterogeneous PEs.
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getWorkingPeList
Gets the list of working PEs from the Host, which excludes failed PEs.- Returns:
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getRequestedMips
Description copied from interface:VmScheduler
Gets the List of MIPS requested by a VM.- Specified by:
getRequestedMips
in interfaceVmScheduler
- Parameters:
vm
- the VM to get the List of requested MIPS- Returns:
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getTotalAvailableMips
public double getTotalAvailableMips()Description copied from interface:VmScheduler
Gets the total amount of MIPS that is currently free. If there are VMs migrating into the Host, their requested MIPS will already be allocated, reducing the total available MIPS.- Specified by:
getTotalAvailableMips
in interfaceVmScheduler
- Returns:
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percentOfMipsToRequest
Gets the percentage of the MIPS requested by a VM that will be in fact requested to the Host, according to the VM migration status:- VM is migrating out of this Host: the MIPS requested by VM will be reduced
according to the
CPU migration overhead
. The number of MIPS corresponding to the CPU overhead is used by the Host to perform the migration; - VM is migrating into this Host: only a fraction of its requested MIPS will be
in fact requested to the Host. This amount is computed by reducing the
CPU migration overhead
; - VM is not in migration: 100% of its requested MIPS will be in fact requested to the Host
- Parameters:
vm
- the VM that is requesting MIPS from the Host- Returns:
- the percentage of MIPS requested by the VM that will be in fact requested to the Host (in scale from [0 to 1], where is 100%)
- VM is migrating out of this Host: the MIPS requested by VM will be reduced
according to the
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getMaxCpuUsagePercentDuringOutMigration
public double getMaxCpuUsagePercentDuringOutMigration()Description copied from interface:VmScheduler
Gets the max percentage of CPU a VM migrating out of this Host can use. Since there may be an overhead associated to the migration process (if theCPU overhead for VM migration
is greater than 0), during the migration, the amount of MIPS the VM can use is reduced due to this overhead.- Specified by:
getMaxCpuUsagePercentDuringOutMigration
in interfaceVmScheduler
- Returns:
- the max percentage of CPU usage during migration (in scale from [0 to 1], where 1 is 100%)
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getVmMigrationCpuOverhead
public double getVmMigrationCpuOverhead()Description copied from interface:VmScheduler
Defines the percentage of Host's CPU usage increase when a VM is migrating in or out of the Host. The value is in scale from 0 to 1 (where 1 is 100%).- Specified by:
getVmMigrationCpuOverhead
in interfaceVmScheduler
- Returns:
- the Host's CPU migration overhead percentage.
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getHost
Description copied from interface:VmScheduler
Gets the host that the VmScheduler get the list of PEs to allocate to VMs.- Specified by:
getHost
in interfaceVmScheduler
- Returns:
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setHost
Description copied from interface:VmScheduler
Sets the host that the VmScheduler get the list of PEs to allocate to VMs. A host for the VmScheduler is set when the VmScheduler is set to a given host. Thus, the host is in charge to set itself to a VmScheduler.- Specified by:
setHost
in interfaceVmScheduler
- Parameters:
host
- the host to be set- Returns:
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