!7

static int n = 20000;

p {
  for (int tableSize = 0; tableSize < 200; tableSize += 20) {
    new L data;
    for i to tableSize: data.add(i);
    O[] array = new O[n];
    long mem1 = usedMemoryAfterGC();
    for i over array: {
      new TreeMap map;
      for (O x : data) map.put(x, x);
      array[i] = map;
    }
    long mem2 = usedMemoryAfterGC();
    double objSize = (mem2-mem1)/(double) l(array);
    int rounded = iround(objSize);
    long f = guessTreeMapSize(tableSize);
    bool ok = rounded == f;
    print((ok ? "OK " : "") + "Hash table size=" + tableSize + ". Approximate object size: " + objSize + " => " + rounded + " bytes. Formula: " + f);
  }
}

Began life as a copy of #1009433