@Override
public boolean inject(ReconfigurationProblem rp) {
Solver solver = rp.getSolver();
Collection<Node> nodes = constraint.getInvolvedNodes();
BoolVar[] spareNode = new BoolVar[nodes.size()];
int i = 0;
for (Node node : constraint.getInvolvedNodes()) {
BoolVar state = rp.getNodeAction(node).getState();
IntVar NbVms = rp.getNbRunningVMs()[rp.getNode(node)];
spareNode[i] = VF.bool(StringUtils.randomName(), solver);
// if the server is off (state = false), then it is not free
solver.post(new FastImpliesEq(VF.not(state), spareNode[i], 0));
// if the server hosts VMs, then it is not free
solver.post(new FastImpliesEq(ICF.arithm(NbVms, "!=", 0).reif(), spareNode[i], 0));
i++;
}
IntVar spareNodes = VF.bounded("freeNumber", 0, nodes.size(), solver);
solver.post(ICF.sum(spareNode, spareNodes));
solver.post(ICF.arithm(spareNodes, ">=", constraint.getMinSpareNodes()));
return true;
}
@Override
public String toString() {
return "relocate(doReinstantiation="
+ prettyMethod(doReinstantiation)
+ " ,vm="
+ vm
+ " ,from="
+ src
+ "("
+ rp.getNode(src)
+ ")"
+ " ,to="
+ (dSlice.getHoster().isInstantiated()
? rp.getNode(dSlice.getHoster().getValue())
: dSlice.getHoster().toString())
+ ")";
}
@Override
public boolean insertActions(Solution s, ReconfigurationPlan plan) {
DurationEvaluators dev = rp.getDurationEvaluators();
// Only if the VM doesn't stay
if (s.getIntVal(cSlice.getHoster()) != (s.getIntVal(dSlice.getHoster()))) {
Action a;
Node dst = rp.getNode(s.getIntVal(dSlice.getHoster()));
// Migration
if (s.getIntVal(doReinstantiation) == 0) {
int st = s.getIntVal(getStart());
int ed = s.getIntVal(getEnd());
if (getBandwidth() != null) {
a = new MigrateVM(vm, src, dst, st, ed, s.getIntVal(getBandwidth()));
} else {
a = new MigrateVM(vm, src, dst, st, ed);
}
plan.add(a);
// Re-instantiation
} else {
VM newVM = rp.cloneVM(vm);
if (newVM == null) {
rp.getLogger().error("Unable to get a new int to plan the re-instantiate of VM {}", vm);
return false;
}
org.btrplace.plan.event.ForgeVM fvm =
new org.btrplace.plan.event.ForgeVM(
newVM,
s.getIntVal(dSlice.getStart())
- dev.evaluate(rp.getSourceModel(), org.btrplace.plan.event.ForgeVM.class, vm),
s.getIntVal(dSlice.getStart()));
// forge the new VM from a template
plan.add(fvm);
// Boot the new VM
int endForging = fvm.getEnd();
org.btrplace.plan.event.BootVM boot =
new org.btrplace.plan.event.BootVM(
newVM,
dst,
endForging,
endForging
+ dev.evaluate(
rp.getSourceModel(), org.btrplace.plan.event.BootVM.class, newVM));
boot.addEvent(Action.Hook.PRE, new SubstitutedVMEvent(vm, newVM));
return plan.add(boot)
&& plan.add(
new org.btrplace.plan.event.ShutdownVM(
vm, src, boot.getEnd(), s.getIntVal(cSlice.getEnd())));
}
}
return true;
}
@Override
public boolean inject(ReconfigurationProblem rp) {
Collection<Node> nodes = constraint.getInvolvedNodes();
Solver solver = rp.getSolver();
PowerView pvServers =
(PowerView) rp.getSourceModel().getView(F4GConfigurationAdapter.VIEW_POWER_IDLES);
PowerView pvVMs =
(PowerView) rp.getSourceModel().getView(F4GConfigurationAdapter.VIEW_POWER_PER_VM);
for (Node node : nodes) {
IntVar powerIdle = VariableFactory.fixed(pvServers.getPower(node), solver);
IntVar powerperVM = VariableFactory.fixed(pvVMs.getPower(node), solver);
IntVar powerVMS = VariableFactory.bounded("powerVMS", 0, Integer.MAX_VALUE / 100, solver);
IntConstraintFactory.times(rp.getNbRunningVMs()[rp.getNode(node)], powerperVM, powerVMS);
solver.post(
IntConstraintFactory.arithm(
powerVMS, "+", powerIdle, "<=", constraint.getMaxServerPower()));
}
return true;
}
/**
* Make a new model.
*
* @param p the RP to use as a basis.
* @param e the VM managed by the action
* @throws org.btrplace.scheduler.SchedulerException if an error occurred
*/
public RelocatableVM(ReconfigurationProblem p, VM e) throws SchedulerException {
// Get vars
vm = e;
rp = p;
src = rp.getSourceModel().getMapping().getVMLocation(e);
org.chocosolver.solver.Model csp = rp.getModel();
Model mo = rp.getSourceModel();
// Default values
start = rp.getStart();
end = rp.getStart();
duration = csp.intVar(0);
state = csp.boolVar(true);
// If not manageable, the VM stays on the current host
if (!p.getManageableVMs().contains(e)) {
stay = csp.boolVar(true);
doReinstantiation = csp.boolVar(false);
manageable = false;
IntVar host = rp.makeCurrentHost(vm, PREFIX_STAY, vm, ").host");
cSlice =
new SliceBuilder(rp, vm, PREFIX_STAY, vm.toString(), ").cSlice")
.setHoster(host)
.setEnd(rp.makeUnboundedDuration(PREFIX_STAY, vm, ").cSlice_end"))
.build();
dSlice =
new SliceBuilder(rp, vm, PREFIX_STAY, vm, ").dSlice")
.setHoster(host)
.setStart(cSlice.getEnd())
.build();
return;
}
// The VM can move (to re-instantiate or migrate) OR STAY to the same host
stay = csp.boolVar(rp.makeVarLabel(vm, "stay"));
cSlice =
new SliceBuilder(rp, vm, PREFIX, vm, ").cSlice")
.setHoster(rp.getNode(rp.getSourceModel().getMapping().getVMLocation(vm)))
.setEnd(rp.makeUnboundedDuration(PREFIX, vm, ").cSlice_end"))
.build();
dSlice =
new SliceBuilder(rp, vm, PREFIX, vm, ").dSlice")
.setStart(rp.makeUnboundedDuration(PREFIX, vm, ").dSlice_start"))
.build();
// Update start and end vars of the action
start = dSlice.getStart();
end = cSlice.getEnd();
csp.post(new Arithmetic(end, Operator.LE, rp.getEnd()));
// Get some static durations from evaluators
DurationEvaluators dev = rp.getDurationEvaluators();
int migrateDuration = dev.evaluate(rp.getSourceModel(), MigrateVM.class, vm);
int bootDuration = dev.evaluate(rp.getSourceModel(), org.btrplace.plan.event.BootVM.class, vm);
int forgeD =
p.getDurationEvaluators()
.evaluate(p.getSourceModel(), org.btrplace.plan.event.ForgeVM.class, vm);
// Compute the re-instantiation duration
int reInstantiateDuration = bootDuration + forgeD;
reInstantiateDuration = forgeD; // Compliant with CMaxOnlineTest and others
// Get the networking view if attached
Network network = Network.get(mo);
IntVar migrationDuration;
if (network != null) {
// Set the migration algorithm
postCopy = mo.getAttributes().get(vm, "postCopy", false);
// Create unbounded/large domain vars for migration duration and bandwidth
migrationDuration = p.makeUnboundedDuration("migration(", vm, ").duration");
bandwidth = csp.intVar(PREFIX + vm + ").bandwidth", 0, Integer.MAX_VALUE / 100, true);
}
// No networking view, set the duration from the evaluator
else {
// The duration can still be 0 => the VM STAY !
migrationDuration =
csp.intVar(
rp.makeVarLabel("migration(", vm, ").duration"), new int[] {0, migrateDuration});
bandwidth = null;
}
// Possibly re-instantiate (if some attributes are defined)
if (mo.getAttributes().get(vm, "clone", false) && mo.getAttributes().isSet(vm, "template")) {
doReinstantiation = csp.boolVar(rp.makeVarLabel("relocation_method(", vm, ")"));
duration =
csp.intVar(
rp.makeVarLabel(PREFIX, vm, ").duration"),
Math.min(migrationDuration.getLB(), reInstantiateDuration),
Math.max(migrationDuration.getUB(), reInstantiateDuration),
true);
// Re-instantiate or migrate
// (Prefer the re-instantiation if the duration are the same, otherwise choose the min)
rp.getModel()
.ifThenElse(
rp.getModel()
.or(
new Arithmetic(
doReinstantiation, Operator.EQ, 0), // can be instantiated externally !
new Arithmetic(migrationDuration, Operator.LT, reInstantiateDuration)),
new Arithmetic(duration, Operator.EQ, migrationDuration),
new Arithmetic(duration, Operator.EQ, reInstantiateDuration));
// If it is a re-instantiation then specify that the dSlice must start AFTER the Forge delay
IntVar time =
csp.intVar(rp.makeVarLabel(doReinstantiation.getName(), " * ", forgeD), 0, forgeD, false);
csp.post(csp.times(doReinstantiation, forgeD, time));
csp.post(new Arithmetic(start, Operator.GE, time));
// Be sure that doReinstantiation will be instantiated
csp.post(new FastIFFEq(doReinstantiation, duration, reInstantiateDuration));
}
// The VM either migrate or stay but won't be re-instantiated for sure
else {
doReinstantiation = csp.boolVar(false);
duration = migrationDuration;
}
// If the VM stay (src host == dst host), then duration = 0
csp.post(new FastIFFEq(stay, dSlice.getHoster(), cSlice.getHoster().getValue()));
csp.post(new FastIFFEq(stay, duration, 0));
// We have to force the migration duration equals to 0 if it stays
// otherwise, the variable will be free
csp.post(new FastIFFEq(stay, migrationDuration, 0));
// Create the task ('default' cumulative constraint with a height of 1)
migrationTask = new Task(start, duration, end);
}