warn about the profiler when used in tests

distributed/cli/tests/test_dask_scheduler.py

@@ -475,6 +475,11 @@ def test_version_option():
     assert result.exit_code == 0
 
 
+@pytest.mark.filterwarnings(
+    "ignore"
+    ":The profiler was enabled in .* running the profiler in tests is not recommended"
+    ":RuntimeWarning"
+)
 @pytest.mark.slow
 def test_idle_timeout():
     start = time()
@@ -483,8 +488,8 @@ def test_idle_timeout():
         distributed.cli.dask_scheduler.main, ["--idle-timeout", "1s"]
     )
     stop = time()
-    assert 1 < stop - start < 10
     assert result.exit_code == 0
+    assert 1 < stop - start < 10
 
 
 @pytest.mark.slow

distributed/core.py

@@ -3,6 +3,7 @@
 import asyncio
 import inspect
 import logging
+import os
 import sys
 import threading
 import traceback
@@ -356,6 +357,15 @@ def __init__(
 
         if not hasattr(self.io_loop, "profile"):
             if dask.config.get("distributed.worker.profile.enabled"):
+                current_test = os.environ.get("PYTEST_CURRENT_TEST")
+                if current_test:
+                    warnings.warn(
+                        f"The profiler was enabled in {current_test}."
+                        " running the profiler in tests is not recommended.",
+                        RuntimeWarning,
+                        stacklevel=2,
+                    )
+
                 ref = weakref.ref(self.io_loop)
 
                 def stop() -> bool: