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.LinkedList;
   6
   7 import org.slf4j.Logger;
   8 import org.slf4j.LoggerFactory;
   9
  10 import at.ac.tuwien.lsdc.exception.OutOfPMsException;
  11 import at.ac.tuwien.lsdc.exception.VMResizeException;
  12 import at.ac.tuwien.lsdc.types.Application;
  13 import at.ac.tuwien.lsdc.types.PhysicalMachine;
  14 import at.ac.tuwien.lsdc.types.ScenarioType;
  15 import at.ac.tuwien.lsdc.types.SchedulerEvent;
  16 import at.ac.tuwien.lsdc.types.SchedulerEvent.EventType;
  17 import at.ac.tuwien.lsdc.types.SchedulerType;
  18 import at.ac.tuwien.lsdc.types.VirtualMachine;
  19 import at.ac.tuwien.lsdc.types.VirtualMachine.VMType;
  20
  21 /**
  22  * Scheduler B.
  23  *
  24  * Initial State: All PMs switched off. If an application arrives, try to modify size, CPU and RAM
  25  * of an existing VM to run the application. If no VM is running, create a new one (start a new PM
  26  * if necessary). If the application has finished decrease the size, CPU and RAM of the VM. If no
  27  * applications are running on a VM, shut down the VM. If no VM is running on a PM, shut down the
  28  * PM. Try to get a maximum of utilization on every PM. Migration: Try to move applications from VMs
  29  * to other VMs to get a better utilization and to use less PMs.
  30  *
  31  * @author jan
  32  *
  33  */
  34 public class SchedulerB extends AbstractScheduler {
  35         /**
  36          * Logger.
  37          */
  38         private static final Logger LOG = LoggerFactory.getLogger(SchedulerB.class);
  39
  40         public SchedulerB(int numPMs, int numCloudPartners, File schedulerLog, ScenarioType scenario)
  41                         throws IOException {
  42                 super(numPMs, numCloudPartners, schedulerLog, scenario);
  43                 vmType = VMType.Resizable;
  44         }
  45
  46         @Override
  47         protected void handleEvents(LinkedList<SchedulerEvent> events) {
  48                 LOG.debug("handleEvents():" + events);
  49                 handleEndEvents(events);
  50                 handleOutsourcedEndEvents(events);
  51                 runMigration();
  52                 runDelayedApps();
  53                 handleOutsourcedStartEvents(events);
  54                 handleStartEvents(events);
  55         }
  56
  57         /**
  58          * Check if we have any delayed apps. Try to launch them.
  59          */
  60         private void runDelayedApps() {
  61                 // TODO: probably mostly the same code as handleStartEvents
  62                 // TOOD: (namely: use case: "start an application",do merge it
  63                 for (Application app : delayedApps) {
  64                         VirtualMachine vm = null;
  65                         for (PhysicalMachine pm : manager.getPMs()) {
  66                                 // TODO: choose PM better to get better Utilization
  67                                 vm = pm.getVirtualMachines().get(
  68                                                 (pm.getVirtualMachines().keySet().toArray(new Integer[0]))[0]);
  69                                 try {
  70                                         vm.resizeVM(vm.getSize() + app.getSize(), vm.getRAM() + app.getRam(),
  71                                                         vm.getCPU() + app.getCpu());
  72                                         break;
  73                                 } catch (VMResizeException ex) {
  74                                         vm = null;
  75                                 }
  76                         }
  77                         if (vm == null) {
  78                                 try {
  79                                         vm = manager.startPhysicalMachine().startVirtualMachine(app.getSize(),
  80                                                         app.getRam(), app.getCpu(), vmType);
  81                                 } catch (OutOfPMsException e) {
  82                                         // LOG.error("failed to start PM.", e);
  83                                         if (federation.askToOutsource(app)) {
  84                                                 insertOutsourcedStartEvent(currTime + 1, app);
  85                                         } else
  86                                                 LOG.info("delaying the start of:" + app);
  87                                         return;
  88                                 }
  89                         }
  90                         vm.startApplication(app);
  91                         app.setRunningOn(vm);
  92                         insertStopEvent(currTime + app.getDuration(), app);
  93                         delayedApps.remove(app);
  94                 }
  95         }
  96
  97         /**
  98          * Check if we can free up a VM to shut it down.
  99          */
 100         private void runMigration() {
 101                 // TODO Auto-generated method stub
 102         }
 103
 104         /**
 105          * Cleanup completed apps. Downsize VMs and if an VM becomes empty, shut down VM + PM.
 106          *
 107          * @param events list of all events that happened in this timeslot.
 108          */
 109         protected void handleEndEvents(LinkedList<SchedulerEvent> events) {
 110                 LOG.debug("stopApps():" + events);
 111                 for (SchedulerEvent evt : events) {
 112                         if (evt.getType() == EventType.endApplication) {
 113                                 VirtualMachine vm = evt.getApp().getRunningOn();
 114                                 evt.getApp().setRunningOn(null);
 115                                 vm.stopApplication(evt.getApp());
 116                                 try {
 117                                         vm.resizeVM(vm.getSize() - evt.getApp().getSize(), vm.getRAM()
 118                                                         - evt.getApp().getRam(), vm.getCPU() - evt.getApp().getCpu());
 119                                 } catch (VMResizeException e) {
 120                                         // LOG.error("failed to resize VM: " + e.getVm(), e);
 121                                 }
 122                                 if (vm.getApplications().size() == 0) {
 123                                         PhysicalMachine pm = vm.getRunningOn();
 124                                         pm.stopVirtualMachine(vm);
 125                                         manager.stopPhysicalMachine(pm.getId());
 126                                 }
 127                         }
 128                 }
 129         }
 130
 131         /**
 132          * Try to start all Apps. Upsize the VM, if not possible start another PM, if not possible,
 133          * delay start.
 134          *
 135          * @param events list of all events that happened in this timeslot.
 136          */
 137         protected void handleStartEvents(LinkedList<SchedulerEvent> events) {
 138                 LOG.debug("startApps():" + events);
 139                 for (SchedulerEvent evt : events) {
 140                         if (evt.getType() == EventType.startApplication) {
 141                                 VirtualMachine vm = null;
 142                                 for (PhysicalMachine pm : manager.getPMs()) {
 143                                         // TODO: choose VM with good Utilization to get even better utilization
 144                                         vm = pm.getVirtualMachines().get(
 145                                                         (pm.getVirtualMachines().keySet().toArray(new Integer[0]))[0]);
 146                                         try {
 147                                                 vm.resizeVM(vm.getSize() + evt.getApp().getSize(), vm.getRAM()
 148                                                                 + evt.getApp().getRam(), vm.getCPU() + evt.getApp().getCpu());
 149                                                 break;
 150                                         } catch (VMResizeException ex) {
 151                                                 vm = null;
 152                                         }
 153                                 }
 154                                 if (vm == null) {
 155                                         try {
 156                                                 vm = manager.startPhysicalMachine().startVirtualMachine(
 157                                                                 evt.getApp().getSize(), evt.getApp().getRam(),
 158                                                                 evt.getApp().getCpu(), vmType);
 159                                         } catch (OutOfPMsException e) {
 160                                                 if (federation.askToOutsource(evt.getApp())) {
 161                                                         insertOutsourcedStartEvent(currTime + 1, evt.getApp());
 162                                                 } else
 163                                                         LOG.info("delaying the start of:" + evt.getApp());
 164                                                 delayedApps.add(evt.getApp());
 165                                                 return;
 166                                         }
 167                                 }
 168                                 vm.startApplication(evt.getApp());
 169                                 evt.getApp().setRunningOn(vm);
 170                                 insertStopEvent(currTime + evt.getApp().getDuration(), evt.getApp());
 171                         }
 172                 }
 173         }
 174
 175         @Override
 176         protected String getSchedulerType() {
 177                 return SchedulerType.B.toString();
 178         }
 179
 180 }