def METHOD_NAME(self):
    '''
    Example:
        pprint(awg._memory_manager.mem_usage(), sort_dicts=False)
    '''
    result = {}
    result[' Block size'] = ['Created', 'Allocated']
    for size in self._slot_sizes:
        result[str(size)] = [0,0,0]
    for slot in self._slots:
        stats = result[str(slot.size)]
        stats[0] += 1
        stats[1] += slot.allocated
    result['Free'] = {size:len(slots) for size,slots in self._free_memory_slots.items()}
    return result