code: def test_memory_used_output(ray_start_regular):
      address = ray_start_regular["address"]
      import numpy as np
  
      _ = ray.put(np.ones(8 * 1024 * 1024, dtype=np.int8))
  
      info = memory_summary(address)
      print(info)
      assert count(info, "Plasma memory usage 8 MiB") == 1, info
      assert count(info, "8388861.0 B") == 2, info
  
file_path: ray/python/ray/tests/test_memstat.py
imports: import os
  import time
  import numpy
  import pytest
  import ray
  from ray._private.internal_api import memory_summary
  from ray._private.test_utils import Semaphore, wait_for_condition
  from ray.cluster_utils import Cluster, cluster_not_supported
label_desc: Use image node_id 11 for calling a global function with example usage: test_memory_used_output(ray_start_regular) without return types