svoid installSimpleMemoryWarningSystem() {
  MemoryWarningSystem.setPercentageUsageThreshold(0.6);

  new MemoryWarningSystem mws;
  mws.addListener(new MemoryWarningSystem.Listener() {
    public void memoryUsageLow(long usedMemory, long maxMemory) {
      infoBox_noHide("Memory usage low!!!");
      double percentageUsed = ((double) usedMemory) / maxMemory;
      print("percentageUsed = " + percentageUsed);
      MemoryWarningSystem.setPercentageUsageThreshold(0.8);
    }
  });
  print("Memory warning system installed, will print here & show info box");
}