f.createNodes(test.getPath(), numLevels, nodesPerLevel,
mixins, saveInterval).execute();
// save nodes
f.save(test.getPath()).execute();
NodeIterator nodes = f.getRandomNodes(f.traverseNodes(test.getPath()));
while (end > System.currentTimeMillis()) {
Operation op = f.runInSequence(new Operation[]{
getRandomOperations(f, nodes),
f.save("/")
});