Examples with Attributes org.btrplace.model.Attributes used on opensource projects

Example 6 with Attributes

use of org.btrplace.model.Attributes in project scheduler by btrplace.

the class CNetwork method beforeSolve.

@Override
public boolean beforeSolve(ReconfigurationProblem rp) throws SchedulerException {
    Model mo = rp.getSourceModel();
    Attributes attrs = mo.getAttributes();
    // Pre-compute duration and bandwidth for each VM migration
    for (VMTransition migration : rp.getVMActions()) {
        if (!(migration instanceof RelocatableVM)) {
            continue;
        }
        // Get vars from migration
        VM vm = migration.getVM();
        IntVar bandwidth = ((RelocatableVM) migration).getBandwidth();
        IntVar duration = migration.getDuration();
        Node src = rp.getSourceModel().getMapping().getVMLocation(vm);
        // Try to get the destination node
        Node dst;
        if (!migration.getDSlice().getHoster().isInstantiated()) {
            throw new SchedulerModelingException(null, "Destination node for VM '" + vm + "' should be known !");
        }
        if (!mo.getAttributes().isSet(vm, "memUsed")) {
            throw new SchedulerModelingException(null, "Unable to retrieve 'memUsed' attribute for the vm '" + vm + "'");
        }
        dst = rp.getNode(migration.getDSlice().getHoster().getValue());
        if (src.equals(dst)) {
            try {
                ((RelocatableVM) migration).getBandwidth().instantiateTo(0, Cause.Null);
                continue;
            } catch (ContradictionException e) {
                rp.getLogger().debug("Contradiction exception when trying to instantiate bandwidth and " + " duration variables for " + vm + " migration", e);
                return false;
            }
        }
        // Get attribute vars
        int memUsed = attrs.get(vm, "memUsed", -1);
        // Get VM memory activity attributes if defined, otherwise set an idle workload on the VM
        // Minimal observed value on idle VM
        double hotDirtySize = attrs.get(vm, "hotDirtySize", 5.0);
        // Minimal observed value on idle VM
        double hotDirtyDuration = attrs.get(vm, "hotDirtyDuration", 2.0);
        double coldDirtyRate = attrs.get(vm, "coldDirtyRate", 0.0);
        // Get the maximal bandwidth available on the migration path
        int maxBW = net.getRouting().getMaxBW(src, dst);
        // Compute the duration related to each enumerated bandwidth
        double durationMin;
        double durationColdPages;
        double durationHotPages;
        double durationTotal;
        // Cheat a bit, real is less than theoretical (8->9)
        double bandwidthOctet = maxBW / 9.0;
        // Estimate the duration for the current bandwidth
        durationMin = memUsed / bandwidthOctet;
        if (durationMin > hotDirtyDuration) {
            durationColdPages = (hotDirtySize + (durationMin - hotDirtyDuration) * coldDirtyRate) / (bandwidthOctet - coldDirtyRate);
            durationHotPages = (hotDirtySize / bandwidthOctet * ((hotDirtySize / hotDirtyDuration) / (bandwidthOctet - (hotDirtySize / hotDirtyDuration))));
            durationTotal = durationMin + durationColdPages + durationHotPages;
        } else {
            durationTotal = durationMin + (((hotDirtySize / hotDirtyDuration) * durationMin) / (bandwidthOctet - (hotDirtySize / hotDirtyDuration)));
        }
        // Instantiate the computed bandwidth and duration
        try {
            // prevent from a 0 duration when the memory usage is very low
            int dd = (int) Math.max(1, Math.round(durationTotal));
            duration.instantiateTo(dd, Cause.Null);
            bandwidth.instantiateTo(maxBW, Cause.Null);
        } catch (ContradictionException e) {
            rp.getLogger().debug("Contradiction exception when trying to instantiate bandwidth and " + " duration variables for " + vm + " migration: ", e);
            return false;
        }
    }
    // Add links and switches constraints
    addLinkConstraints(rp);
    addSwitchConstraints(rp);
    return true;
}