v2.0.0 - Integrating power-aware features into regular simulation objects, enabling simulations that are both power- and network-aware

INTRODUCTION

Enables power-aware simulations using regular classes such asDatacenterSimple, HostSimple and VmSimple. This way, it automatically allows creating simulations that are both network- and power-aware by using the network versions of such classes.

Any Host now has a PowerSupply attribute that allows to get power consumption data from. To enable collecting such data, it's is required to set a PowerModel object by calling host.getPowerSupply().setPowerModel(powerModel). The only difference from previous versions is that the PowerModel is defined inside the PowerSupply instead of the Host.

This way, if you don't need power-aware simulations, you need to do nothing because that is the default behaviour.

There are some examples such as the PowerExample and the MigrationExample2_PowerUsage.

More details are presented below.

VmUtilizationHistory

Adds the VmUtilizationHistory class to store resource utilization history by a given Vm. This way, all Vm implementations have a UtilizationHistory attribute.

PowerVm

PowerVm class was removed and its methods were moved to a new VmUtilizationHistory class.
The Vm now has an attribute VmUtilizationHistory that enables collecting CPU utilization data.
The VmUtilizationHistory.enabled is set by default to false. This way, the user have to manually enable the history to start collecting utilization data. It was disabled by default to reduce memory usage.

PowerSupply

Adds the PowerSupply interface to concentrate all power consumption data and operations, enabling any Host to get such an information. The PowerSupply includes the PowerModel that was previously inside the PowerHost class.

PowerHost

PowerHost class removed and its methods merged into Host. A PowerSupply interface was introduced to group power consumption data (including a PowerModel). This way, any Host can extract power consumption data. It's just required a PowerModel to be set in the PowerSupply.

PowerHostUtilizationHistory and HostDynamicWorkloadSimple

PowerHostUtilizationHistory and HostDynamicWorkloadSimple class were removed and their code merged into the HostSimple class.

The Host's getUtilizationHistory method gets the CPU utilization history from its VMs. The Host doesn't store any data. The VM utilization history must be enabled to allow getting such data, by calling vm.getUtilizationHistory().enable().

VmAllocationPolicy

Refactors VmAllocationPolicy implementations, mainly the VmAllocationPolicyAbstract and VmAllocationPolicySimple.

Changed the method Host findHostForVm(final Vm vm) to Optional<Host> findHostForVm(final Vm vm), making it return an Optional to explicitly indicate that a suitable Host may not be found for a given VM.

The method was defined as abstract in the VmAllocationPolicyAbstract and it's the single one initially required to be implemented by subclasses of VmAllocationPolicyAbstract.

Removes PowerVmAllocationPolicySimple because it was doing nothing that other policies weren't doing. Introduces the VmAllocationPolicyFirstFit.

Renames the package org.cloudbus.cloudsim.allocationpolicies.power to org.cloudbus.cloudsim.allocationpolicies.migration. Such allocation policies enable VM migration and can be used now for any kind of simulation, not only for power-aware ones. All internal classes and interfaces were renamed, removing the prefix Power.

NOTICE

Check release 2.2.0 for important updates about power-aware simulations.