protected int getMemoryUsed() {
      int result = 0;
      if (values != null) {
        for (final SimpleValue value : values) {
          result += value.getMemoryUsed();
        }
      }
      return result;
    }
Returns the approximate amount of memory used to implement this object.
geode-core/src/main/java/org/apache/geode/internal/statistics/StatArchiveReader.java