hu.mta.sztaki.lpds.cloud.simulator.iaas.vmscheduling
Class RoundRobinScheduler

java.lang.Object
  hu.mta.sztaki.lpds.cloud.simulator.iaas.vmscheduling.Scheduler
      hu.mta.sztaki.lpds.cloud.simulator.iaas.vmscheduling.FirstFitScheduler
          hu.mta.sztaki.lpds.cloud.simulator.iaas.vmscheduling.RoundRobinScheduler

public class RoundRobinScheduler
extends FirstFitScheduler

Provides a scheduler that uses the round robin PM iterator to traverse through the IaaS's running machines list. This ensures uniform use of the PMs on the long run. Other than the random PM selection this class utilizes the FirstFitScheduler's logic of VM placement and queue management. Unless VM migration is used to reduce the PMs under utilization this scheduler is less energy efficient than the generic first fit as that is always trying to exhaust the resources of a PM before going for another one.

Author:

"Gabor Kecskemeti, Laboratory of Parallel and Distributed Systems, MTA SZTAKI (c) 2015"

Nested Class Summary

Nested classes/interfaces inherited from class hu.mta.sztaki.lpds.cloud.simulator.iaas.vmscheduling.Scheduler

Scheduler.QueueingEvent

Field Summary

Fields inherited from class hu.mta.sztaki.lpds.cloud.simulator.iaas.vmscheduling.FirstFitScheduler

raBiggestNotSuitable, ras

Fields inherited from class hu.mta.sztaki.lpds.cloud.simulator.iaas.vmscheduling.Scheduler

freeCapacity, parent, pmComparator, pmstateChanged, publicTQ, queue

Constructor Summary

RoundRobinScheduler(IaaSService parent)
Passes the IaaSService further to its super class.

Method Summary

protected PMIterator

instantiateIterator() Returns with the RoundRobin PM iterator.

Methods inherited from class hu.mta.sztaki.lpds.cloud.simulator.iaas.vmscheduling.FirstFitScheduler

getPMIterator, scheduleQueued

Methods inherited from class hu.mta.sztaki.lpds.cloud.simulator.iaas.vmscheduling.Scheduler

dropVMrequest, getQueuedVMs, getQueueLength, getTotalQueued, manageQueueRemoval, manageQueueRemoval, scheduleVMrequest, subscribeQueueingEvents, unsubscribeQueueingEvents

Methods inherited from class java.lang.Object

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

Constructor Detail

RoundRobinScheduler

public RoundRobinScheduler(IaaSService parent)

Passes the IaaSService further to its super class.

Parameters:

parent - the IaaS Service which this RoundRobinScheduler operates on

Method Detail

instantiateIterator

protected PMIterator instantiateIterator()

Returns with the RoundRobin PM iterator.

Overrides:

instantiateIterator in class FirstFitScheduler

Returns:

the desired PM iterator to be used for traversing the PMs while doing the scheduling