code: def warmup():
      x = np.zeros(10**6, dtype=np.uint8)
      for _ in range(5):
          for _ in range(5):
              ray.put(x)
          for _ in range(5):
              ray.get([dummy_task.remote(0) for _ in range(1000)])
  
file_path: ray/python/ray/tests/perf_integration_tests/test_perf_integration.py
imports: import numpy
  import pytest
  import ray
  from ray.tests.conftest import _ray_start_cluster
label_desc: Use image node_id 3 for calling a global function with example usage: warmup() without return types