private int doMoves(RebalanceDirector director, PartitionedRegionLoadModel model) {
    int moveCount = 0;

    model.initialize();
    director.initialize(model);
    while (director.nextStep()) {
      moveCount++;
    }

    return moveCount;
  }
This test simulates an existing partitioned region with evenly distributed numbers of buckets,
all of which are exactly the same size and with no replicate copies. A single new member is added
to the cluster and the region is then rebalanced. This represents a best-case scenario for
rebalancing a cluster after the addition of a member.
geode-core/src/jmh/java/org/apache/geode/cache/partitioned/rebalance/RebalanceOnAddingMemberBenchmark.java