code: def test_global_gc(shutdown_only):
      cluster = ray.cluster_utils.Cluster()
      cluster.add_node(
          num_cpus=1,
          num_gpus=0,
          _system_config={
              "local_gc_interval_s": 10,
              "local_gc_min_interval_s": 5,
              "global_gc_min_interval_s": 10,
          },
      )
      cluster.add_node(num_cpus=1, num_gpus=0)
      ray.init(address=cluster.address)
  
      class ObjectWithCyclicRef:
          def __init__(self):
              self.loop = self
  
      @ray.remote(num_cpus=1)
      class GarbageHolder:
          def __init__(self):
              gc.disable()
              x = ObjectWithCyclicRef()
              self.garbage = weakref.ref(x)
  
          def has_garbage(self):
              return self.garbage() is not None
  
      try:
          gc.disable()
  
          # Local driver.
          local_ref = weakref.ref(ObjectWithCyclicRef())
  
          # Remote workers.
          actors = [GarbageHolder.remote() for _ in range(2)]
          assert local_ref() is not None
          assert all(ray.get([a.has_garbage.remote() for a in actors]))
  
          # GC should be triggered for all workers, including the local driver.
          global_gc()
  
          def check_refs_gced():
              return local_ref() is None and not any(
                  ray.get([a.has_garbage.remote() for a in actors])
              )
  
          wait_for_condition(check_refs_gced, timeout=30)
      finally:
          gc.enable()
  
file_path: ray/python/ray/tests/test_global_gc.py
imports: import gc
  import logging
  import weakref
  import numpy
  import pytest
  import ray
  import ray.cluster_utils
  from ray._private.internal_api import global_gc
  from ray._private.test_utils import wait_for_condition
label_desc: Use image node_id 2 for calling a global function with example usage: test_global_gc(shutdown_only) and returns: unknown, unknown