src/at/ac/tuwien/lsdc/sched/SchedulerB.java

   1 package at.ac.tuwien.lsdc.sched;
   2
   3 import java.io.File;
   4 import java.io.IOException;
   5 import java.util.Collections;
   6 import java.util.LinkedList;
   7 import java.util.List;
   8
   9 import org.slf4j.Logger;
  10 import org.slf4j.LoggerFactory;
  11
  12 import at.ac.tuwien.lsdc.exception.OutOfPMsException;
  13 import at.ac.tuwien.lsdc.exception.VMResizeException;
  14 import at.ac.tuwien.lsdc.types.Application;
  15 import at.ac.tuwien.lsdc.types.PhysicalMachine;
  16 import at.ac.tuwien.lsdc.types.ScenarioType;
  17 import at.ac.tuwien.lsdc.types.SchedulerEvent;
  18 import at.ac.tuwien.lsdc.types.SchedulerType;
  19 import at.ac.tuwien.lsdc.types.VirtualMachine;
  20 import at.ac.tuwien.lsdc.types.VirtualMachine.VMType;
  21
  22 /**
  23  * Scheduler B.
  24  *
  25  * Initial State: All PMs switched off. If an application arrives, try to modify size, CPU and RAM
  26  * of an existing VM to run the application. If no VM is running, create a new one (start a new PM
  27  * if necessary). If the application has finished decrease the size, CPU and RAM of the VM. If no
  28  * applications are running on a VM, shut down the VM. If no VM is running on a PM, shut down the
  29  * PM. Try to get a maximum of utilization on every PM. Migration: Try to move applications from VMs
  30  * to other VMs to get a better utilization and to use less PMs.
  31  *
  32  * @author jan
  33  *
  34  */
  35 public class SchedulerB extends AbstractSchedulerWithMigration {
  36         /**
  37          * Logger.
  38          */
  39         private static final Logger LOG = LoggerFactory.getLogger(SchedulerB.class);
  40
  41         public SchedulerB(int numPMs, int numCloudPartners, File schedulerLog, ScenarioType scenario)
  42                         throws IOException {
  43                 super(numPMs, numCloudPartners, schedulerLog, scenario);
  44                 vmType = VMType.Resizable;
  45         }
  46
  47         @Override
  48         protected boolean deployApp(VirtualMachine vm, Application app) {
  49                 VirtualMachine current = app.getRunningOn();
  50                 boolean deployed = false;
  51                 if (!vm.enoughResources(app)) {
  52                         try {
  53                                 vm.resizeUp(app);
  54                         } catch (VMResizeException ex) {
  55                                 return false;
  56                         }
  57                 }
  58                 deployed = vm.startApplication(app);
  59                 if (deployed) {
  60                         app.setRunningOn(vm);
  61                         if (current != null) {
  62                                 current.stopApplication(app);
  63                                 current.resizeDown(app);
  64                         }
  65                 }
  66                 return deployed;
  67         }
  68
  69         /**
  70          * Cleanup completed apps. Downsize VMs and if an VM becomes empty, shut down VM + PM.
  71          *
  72          * @param events list of all events that happened in this timeslot.
  73          */
  74         @Override
  75         protected void handleEndEvents(LinkedList<SchedulerEvent> events) {
  76 //              LOG.debug("stopApps():" + events);
  77                 for (SchedulerEvent evt : events) {
  78                         VirtualMachine vm = evt.getApp().getRunningOn();
  79                         evt.getApp().setRunningOn(null);
  80                         vm.stopApplication(evt.getApp());
  81                         vm.resizeDown(evt.getApp());
  82
  83                         if (vm.getApplications().size() == 0) {
  84                                 PhysicalMachine pm = vm.getRunningOn();
  85                                 pm.stopVirtualMachine(vm);
  86                                 manager.stopPhysicalMachine(pm.getId());
  87                         }
  88                 }
  89         }
  90
  91         /**
  92          * Try to start all Apps. Upsize the VM, if not possible start another PM, if not possible,
  93          * delay start.
  94          *
  95          * @param events list of all events that happened in this timeslot.
  96          */
  97         @Override
  98         protected void handleStartEvents(LinkedList<SchedulerEvent> events) {
  99 //              LOG.debug("startApps():" + events);
 100                 boolean deployed = false;
 101                 for (SchedulerEvent evt : events) {
 102                         deployed = false;
 103                         VirtualMachine vm = null;
 104                         List<PhysicalMachine> sortedPMs = manager.getSortedPMs();
 105                         Collections.reverse(sortedPMs);
 106                         for (PhysicalMachine pm : sortedPMs) {
 107                                 if (pm.isRunning() && (pm.countCurrentlyRunningVMs() > 0)) {
 108                                         vm = pm.getVirtualMachines().values().iterator().next();
 109                                         deployed = deployApp(vm, evt.getApp());
 110                                         if (deployed)
 111                                                 break;
 112                                 }
 113                         }
 114                         if (!deployed) {
 115                                 try {
 116                                         vm = manager.startPhysicalMachine().startVirtualMachine(evt.getApp().getSize(),
 117                                                         evt.getApp().getRam(), evt.getApp().getCpu(), vmType);
 118                                         deployed = deployApp(vm, evt.getApp());
 119                                 } catch (OutOfPMsException e) {
 120                                         if (federation.askToOutsource(evt.getApp())) {
 121                                                 insertOutsourcedStartEvent(currTime + 1, evt.getApp());
 122                                         } else {
 123                                                 LOG.info("delaying the start of:" + evt.getApp());
 124                                                 delayedApps.add(evt.getApp());
 125                                                 return;
 126                                         }
 127                                 }
 128                         }
 129                         if (deployed) {
 130                                 insertStopEvent(currTime + evt.getApp().getDuration(), evt.getApp());
 131
 132                                 if(manager.countCurrentlyRunningPMs() < manager.getMaxPMs()) {
 133                                         Application app = federation.askToInsource();
 134                                         if(app != null) {
 135                                                 insertInsourcedStartEvent(currTime + 1, evt.getApp());
 136                                         }
 137                                 }
 138                         }
 139                 }
 140         }
 141
 142         @Override
 143         protected String getSchedulerType() {
 144                 return SchedulerType.B.toString();
 145         }
 146
 147 }