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                 boolean deployed = false;
  50                 if (!vm.enoughResources(app)) {
  51                         try {
  52                                 vm.resizeUp(app);
  53                         } catch (VMResizeException ex) {
  54                                 return false;
  55                         }
  56                 }
  57                 deployed = vm.startApplication(app);
  58                 if (deployed)
  59                         app.setRunningOn(vm);
  60                 return deployed;
  61         }
  62
  63         /**
  64          * Cleanup completed apps. Downsize VMs and if an VM becomes empty, shut down VM + PM.
  65          *
  66          * @param events list of all events that happened in this timeslot.
  67          */
  68         @Override
  69         protected void handleEndEvents(LinkedList<SchedulerEvent> events) {
  70                 LOG.debug("stopApps():" + events);
  71                 for (SchedulerEvent evt : events) {
  72                         VirtualMachine vm = evt.getApp().getRunningOn();
  73                         evt.getApp().setRunningOn(null);
  74                         vm.stopApplication(evt.getApp());
  75                         vm.resizeDown(evt.getApp());
  76
  77                         if (vm.getApplications().size() == 0) {
  78                                 PhysicalMachine pm = vm.getRunningOn();
  79                                 pm.stopVirtualMachine(vm);
  80                                 manager.stopPhysicalMachine(pm.getId());
  81                         }
  82                 }
  83         }
  84
  85         /**
  86          * Try to start all Apps. Upsize the VM, if not possible start another PM, if not possible,
  87          * delay start.
  88          *
  89          * @param events list of all events that happened in this timeslot.
  90          */
  91         @Override
  92         protected void handleStartEvents(LinkedList<SchedulerEvent> events) {
  93                 LOG.debug("startApps():" + events);
  94                 boolean deployed = false;
  95                 for (SchedulerEvent evt : events) {
  96                         deployed = false;
  97                         VirtualMachine vm = null;
  98                         List<PhysicalMachine> sortedPMs = manager.getSortedPMs();
  99                         Collections.reverse(sortedPMs);
 100                         for (PhysicalMachine pm : sortedPMs) {
 101                                 if (pm.isRunning() && (pm.countCurrentlyRunningVMs() > 0)) {
 102                                         vm = pm.getVirtualMachines().values().iterator().next();
 103                                         deployed = deployApp(vm, evt.getApp());
 104                                         if (deployed)
 105                                                 break;
 106                                 }
 107                         }
 108                         if (!deployed) {
 109                                 try {
 110                                         vm = manager.startPhysicalMachine().startVirtualMachine(evt.getApp().getSize(),
 111                                                         evt.getApp().getRam(), evt.getApp().getCpu(), vmType);
 112                                         deployed = deployApp(vm, evt.getApp());
 113                                 } catch (OutOfPMsException e) {
 114                                         if (federation.askToOutsource(evt.getApp())) {
 115                                                 insertOutsourcedStartEvent(currTime + 1, evt.getApp());
 116                                         } else {
 117                                                 LOG.info("delaying the start of:" + evt.getApp());
 118                                                 delayedApps.add(evt.getApp());
 119                                                 return;
 120                                         }
 121                                 }
 122                         }
 123                         if (deployed)
 124                                 insertStopEvent(currTime + evt.getApp().getDuration(), evt.getApp());
 125                 }
 126         }
 127
 128         @Override
 129         protected String getSchedulerType() {
 130                 return SchedulerType.B.toString();
 131         }
 132
 133 }