private static NumberFormat getNumberFormat() {
    NumberFormat nf = NumberFormat.getNumberInstance();
    nf.setMaximumFractionDigits(2);
    nf.setGroupingUsed(false);
    return nf;
  }
Returns the approximate amount of memory used to implement this object.
geode-core/src/main/java/org/apache/geode/internal/statistics/StatArchiveReader.java