code: def real_time():
      if rmm is None:
          return {"rmm-used": None, "rmm-total": None}
      mr = rmm.mr.get_current_device_resource()
      rmm_pool_size = _get_pool_size(mr)
      rmm_used = _get_allocated_bytes(mr)
      rmm_total = max(rmm_pool_size, rmm_used)
      return {"rmm-used": rmm_used, "rmm-total": rmm_total}
  
label_desc: Use image node_id 3 for calling a global function with example usage: real_time() and returns: dict, dict