code: private void placeVMs(Parameters ps, List<AbstractStrategy<?>> strategies, List<VMTransition> actions, OnStableNodeFirst schedHeuristic, Map<IntVar, VM> map) {
          IntValueSelector rnd = new WorstFit(map, rp, new BiggestDimension());
          if (!useResources) {
              rnd = new RandomVMPlacement(rp, map, true, ps.getRandomSeed());
          }
          IntVar[] hosts = dSlices(actions).map(Slice::getHoster).filter(v -> !v.isInstantiated()).toArray(IntVar[]::new);
          if (hosts.length > 0) {
              strategies.add(new IntStrategy(hosts, new HostingVariableSelector(rp.getModel(), schedHeuristic), rnd));
          }
      }
docs: /*
  Try to place the VMs associated on the actions in a random node while trying first to stay on the current node