093f8d4480
The full suite was the last job to finish in 33 of 43 CI runs since it moved from a 96-core to one 32-core runner (p50 666 s). That runner is ~90% packed, so only more machines help, and one bigger box is poor value: on 96 cores the same files took 25-50% longer each and the suite ran ~1.8x faster for 3x the price. Two 32-core slices scale linearly (simulated from per-file CI timings: 262 s / 252 s vs 514 s on one box). macOS (free 3-core runner, ~7.5 min) would become the slowest required job once Linux splits, so it runs as two slices on the same free runner. --slice now partitions from the checkout alone (sorted round-robin): each slice job restores its own duration cache, and a main push saving a newer cache between the two restores made timed LPT compute different partitions per job, silently dropping or double-running files. Round-robin lands within 5 s of timed LPT at this suite size. Each slice saves its own cache key on main; the runner keeps the restored entries for files outside its slice, so the cache stays complete.
593 lines
23 KiB
Python
593 lines
23 KiB
Python
"""Verify scripts/run_tests_parallel.py kills test-spawned grandchildren.
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Setup
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-----
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A test in this file spawns a long-lived Python grandchild that writes
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its PID + a nonce to a tempfile, then exits without cleaning up.
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With the old ``subprocess.run`` runner, that grandchild would orphan
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and outlive the test (and the whole runner). With the current Popen +
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``start_new_session`` + ``_kill_tree`` runner, the grandchild gets
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SIGKILL'd via process-group kill when its file's pytest exits.
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The leaker test always passes — its only job is to spawn a grandchild
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and walk away. The verifier runs the runner over the leaker file in a
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subprocess, then waits for the grandchild PID to disappear from the
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kernel's process table.
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POSIX-only: Windows has its own grandchild lifecycle (no shared session,
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``taskkill /F /T`` semantics). Marked accordingly.
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"""
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from __future__ import annotations
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import json
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import shutil
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import os
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import subprocess
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import sys
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import textwrap
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import time
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from pathlib import Path
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import pytest
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@pytest.fixture(autouse=True)
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def isolated_probe_environment(monkeypatch):
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# Probe files exercise pytest/runner mechanics, not installed third-party
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# plugins. Autoloading the developer environment changes their startup cost.
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monkeypatch.setenv("PYTEST_DISABLE_PLUGIN_AUTOLOAD", "1")
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def _probe_root(tmp_path):
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root = tmp_path / "runner-root"
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scripts = root / "scripts"
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(scripts / "ci").mkdir(parents=True, exist_ok=True)
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real = Path(__file__).resolve().parents[2] / "scripts"
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shutil.copy2(real / "run_tests_parallel.py", scripts)
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# The runner shares the platforms() spec resolver with the CI lane selector.
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shutil.copy2(real / "ci" / "list_os_marked_tests.py", scripts / "ci")
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return root
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def _pid_alive(pid: int) -> bool:
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"""POSIX: send signal 0 to probe whether ``pid`` is still alive.
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``os.kill(pid, 0)`` raises ``ProcessLookupError`` if the process is
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gone, ``PermissionError`` if it exists but we can't signal it
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(someone else's pid). We treat PermissionError as "alive" because
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the process exists and that's all we need to know.
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"""
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if sys.platform == "win32": # pragma: no cover — POSIX-only test
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# On Windows we'd use OpenProcess + GetExitCodeProcess; this
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# test is skipped on Windows so the path is unreachable.
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raise RuntimeError("_pid_alive POSIX-only")
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try:
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os.kill(pid, 0)
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except ProcessLookupError:
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return False
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except PermissionError:
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return True
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return True
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def test_progress_output_tolerates_legacy_stdout_encoding(tmp_path: Path) -> None:
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"""Progress glyphs must not crash the runner on non-UTF-8 consoles."""
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repo_root = _probe_root(tmp_path)
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runner = repo_root / "scripts" / "run_tests_parallel.py"
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probe_dir = tmp_path / "probe"
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probe_dir.mkdir()
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probe = probe_dir / "test_probe_smoke.py"
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probe.write_text("def test_smoke():\n assert True\n", encoding="utf-8")
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env = os.environ.copy()
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env["PYTHONIOENCODING"] = "cp1252:strict"
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proc = subprocess.run(
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[
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sys.executable,
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str(runner),
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"--paths",
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str(probe_dir),
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"-j",
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"1",
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"--file-timeout",
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"30",
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],
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cwd=probe_dir,
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env=env,
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stdout=subprocess.PIPE,
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stderr=subprocess.STDOUT,
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text=True,
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timeout=60,
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)
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assert proc.returncode == 0, proc.stdout
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assert "UnicodeEncodeError" not in proc.stdout
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assert "1 tests passed" in proc.stdout
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@pytest.mark.platforms("posix")
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@pytest.mark.live_system_guard_bypass
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def test_grandchild_leak_is_killed_by_runner(tmp_path: Path) -> None:
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"""Run the parallel runner over a probe file and verify cleanup.
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1. Materialize a probe file that spawns a long-lived grandchild and
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writes its PID to disk before exiting.
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2. Invoke ``scripts/run_tests_parallel.py`` against the probe file.
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3. Wait for the grandchild PID to vanish (poll for ~5s).
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4. Assert the runner exited cleanly AND the grandchild is dead.
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"""
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repo_root = _probe_root(tmp_path)
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runner = repo_root / "scripts" / "run_tests_parallel.py"
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assert runner.exists(), f"runner missing at {runner}"
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# Probe lives in a temp dir, NOT under tests/, so the regular suite
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# never picks it up — only our explicit invocation does.
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probe_dir = tmp_path / "probe"
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probe_dir.mkdir()
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probe = probe_dir / "test_probe_leaker.py"
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nonce = f"{os.getpid()}-{int(time.time() * 1000)}"
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handoff = tmp_path / f"grandchild-{nonce}.json"
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probe_src = textwrap.dedent(f"""
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import json, os, subprocess, sys, time
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from pathlib import Path
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HANDOFF = Path({str(handoff)!r})
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def test_spawns_grandchild_and_walks_away():
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# Long-lived grandchild: detached, ignores SIGTERM (we want
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# SIGKILL or process-group kill to be the only thing that
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# works, simulating a misbehaving server).
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child = subprocess.Popen(
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[
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sys.executable, "-c",
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"import os, signal, sys, time; "
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"signal.signal(signal.SIGTERM, signal.SIG_IGN); "
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"sys.stdout.write(f'gc-pgid={{os.getpgid(0)}} gc-pid={{os.getpid()}}\\\\n'); "
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"sys.stdout.flush(); "
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"time.sleep(600)",
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],
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stdout=subprocess.PIPE,
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stderr=subprocess.STDOUT,
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# IMPORTANT: do NOT pass start_new_session here. We want
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# the grandchild to inherit the pytest subprocess's
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# process group, so when the runner kills the group the
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# grandchild dies too.
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)
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# Read the first line so we can record gc's pgid in the
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# handoff, then walk away — don't close the pipe (would
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# signal EOF and let the child see SIGPIPE on next write).
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first_line = child.stdout.readline().decode().strip()
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HANDOFF.write_text(json.dumps({{
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"pid": child.pid,
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"diag": first_line,
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"test_pid": os.getpid(),
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"test_pgid": os.getpgid(0),
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}}))
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assert child.pid > 0
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""").strip()
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probe.write_text(probe_src + "\n")
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# Run the parallel runner against just the probe file. The runner
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# discovers under ``tests/`` by default, so we override via --paths.
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proc = subprocess.run(
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[
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sys.executable,
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str(runner),
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"--paths",
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str(probe_dir),
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"-j",
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"1",
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# Tight per-file timeout: the probe finishes in <1s, no
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# need for 10min.
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"--file-timeout",
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"30",
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],
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cwd=probe_dir,
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stdout=subprocess.PIPE,
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stderr=subprocess.STDOUT,
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# The runner declares its stdio UTF-8 (see _make_stdio_glyph_safe);
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# decode the same way so ✓-glyph assertions hold on Windows, where
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# text=True alone would decode with the locale codec (cp1252).
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encoding="utf-8",
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errors="replace",
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timeout=60,
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)
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assert handoff.exists(), (
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f"probe never wrote handoff file; runner output:\n{proc.stdout}"
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)
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handoff_data = json.loads(handoff.read_text())
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grandchild_pid = handoff_data["pid"]
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diag = handoff_data.get("diag", "(no diag)")
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test_pid = handoff_data.get("test_pid")
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test_pgid = handoff_data.get("test_pgid")
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handoff.unlink()
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# The runner must have exited cleanly (probe test passes).
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assert proc.returncode == 0, (
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f"runner exited {proc.returncode}; output:\n{proc.stdout}"
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)
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# The grandchild must be gone. Poll for a bit because process-group
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# SIGKILL + reaping isn't synchronous; on a loaded box it can take
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# a beat.
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deadline = time.monotonic() + 5.0
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while time.monotonic() < deadline:
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if not _pid_alive(grandchild_pid):
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break
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time.sleep(0.05)
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else:
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# Test cleanup: kill the leaked grandchild ourselves so a
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# FAILED assertion doesn't leave a sleep(600) running.
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try:
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os.kill(grandchild_pid, 9)
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except ProcessLookupError:
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pass
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pytest.fail(
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f"grandchild PID {grandchild_pid} survived runner exit; "
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f"diag={diag!r} test_pid={test_pid} test_pgid={test_pgid}; "
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f"runner output:\n{proc.stdout}"
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)
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# ── Bare pytest-flag passthrough ─────────────────────────────────────────────
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#
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# The runner routes any token starting with ``-`` that isn't one of its own
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# options (``-j``/``--jobs``, ``--paths``, ``--slice``, ``--file-timeout``,
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# ``--generate-slices``, ``--files``, ``--include-integration``,
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# ``--files-from``) straight
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# through to each per-file pytest invocation — no ``--`` separator required.
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# Before this, a bare ``-q`` errored out with "unrecognized arguments",
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# forcing a retry on every run. These tests are behavior contracts, not
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# snapshots: they assert that bare flags reach pytest and that value-taking
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# flags (``-k expr``) keep their value instead of having it stolen by the
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# positional-path discovery.
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def _make_probe_dir(tmp_path: Path) -> Path:
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"""Two trivial passing tests, one named test_alpha, one test_beta."""
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probe_dir = tmp_path / "probe"
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probe_dir.mkdir()
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(probe_dir / "test_flagprobe.py").write_text(
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"def test_alpha():\n assert True\n\n"
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"def test_beta():\n assert True\n"
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)
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return probe_dir
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def _run_runner(probe_dir: Path, *extra: str) -> subprocess.CompletedProcess:
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repo_root = _probe_root(probe_dir.parent)
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runner = repo_root / "scripts" / "run_tests_parallel.py"
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return subprocess.run(
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[sys.executable, str(runner), "--paths", str(probe_dir),
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"-j", "1", "--file-timeout", "30", *extra],
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cwd=probe_dir,
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stdout=subprocess.PIPE,
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stderr=subprocess.STDOUT,
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# The runner declares its stdio UTF-8 (see _make_stdio_glyph_safe);
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# decode the same way so ✓-glyph assertions hold on Windows, where
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# text=True alone would decode with the locale codec (cp1252).
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encoding="utf-8",
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errors="replace",
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timeout=60,
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)
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@pytest.mark.parametrize("help_flag", ["-h", "--help"])
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def test_help_prints_usage_without_discovering_or_running_tests(
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tmp_path: Path, help_flag: str
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) -> None:
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"""Runner help stays in argparse instead of becoming a pytest sweep."""
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repo_root = Path(__file__).resolve().parent.parent.parent
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runner = repo_root / "scripts" / "run_tests_parallel.py"
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proc = subprocess.run(
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[sys.executable, str(runner), "--paths", str(tmp_path / "no-tests"), help_flag],
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cwd=repo_root,
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stdout=subprocess.PIPE,
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stderr=subprocess.STDOUT,
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encoding="utf-8",
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errors="replace",
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timeout=10,
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)
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assert proc.returncode == 0, proc.stdout
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assert "usage:" in proc.stdout
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assert "Discovered" not in proc.stdout
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def test_unknown_bare_flag_errors_with_usage_instead_of_sweeping(tmp_path: Path) -> None:
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"""A typo'd flag fails once, up front, and never reaches a per-file pytest.
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Bare tokens are checked against pytest's own option set, so real pytest
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forms (attached short value ``-rA``, bare ``-x``) still pass through and
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run, while ``--jbs`` is rejected with this runner's usage before discovery.
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"""
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probe_dir = _make_probe_dir(tmp_path)
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proc = _run_runner(probe_dir, "--jbs")
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assert proc.returncode == 2, proc.stdout
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assert "usage:" in proc.stdout and "unrecognized arguments: --jbs" in proc.stdout
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assert "Discovered" not in proc.stdout
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proc = _run_runner(probe_dir, "-rA", "-x")
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assert proc.returncode == 0, proc.stdout
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assert "2✓" in proc.stdout or "2 passed" in proc.stdout, proc.stdout
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def test_known_flag_missing_value_errors_with_usage_instead_of_sweeping(
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tmp_path: Path,
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) -> None:
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"""``--tb`` with no value is a pytest UsageError, not a per-file sweep.
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The flag itself is known, so an unknown-token check alone lets it through;
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pytest's own parser must be allowed to reject it up front.
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"""
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probe_dir = _make_probe_dir(tmp_path)
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proc = _run_runner(probe_dir, "--tb")
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assert proc.returncode == 2, proc.stdout
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assert "usage:" in proc.stdout and "--tb: expected one argument" in proc.stdout
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assert "Discovered" not in proc.stdout
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def test_file_retry_self_heals_and_prints_both_attempts(tmp_path: Path) -> None:
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"""A pass-on-retry is green, loud, and retains the failing traceback."""
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repo_root = _probe_root(tmp_path)
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runner = repo_root / "scripts" / "run_tests_parallel.py"
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marker = tmp_path / "ran-once"
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probe = tmp_path / "test_flaky_probe.py"
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probe.write_text(
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textwrap.dedent(
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f"""
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from pathlib import Path
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def test_flaky_once():
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marker = Path({str(marker)!r})
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if not marker.exists():
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marker.write_text("failed once")
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assert False, "simulated first-attempt flake"
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assert True
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"""
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),
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encoding="utf-8",
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)
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proc = subprocess.run(
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[
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sys.executable,
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str(runner),
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"--files",
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str(probe),
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"--file-retries",
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"1",
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"-j",
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"1",
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"-q",
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],
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cwd=tmp_path,
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stdout=subprocess.PIPE,
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stderr=subprocess.STDOUT,
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text=True,
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timeout=60,
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)
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assert proc.returncode == 0, proc.stdout
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assert "FLAKY file" in proc.stdout
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assert "simulated first-attempt flake" in proc.stdout
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assert "first-attempt output" in proc.stdout
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assert "retry output" in proc.stdout
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# ---------------------------------------------------------------------------
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# Zero-collection is not a pass; node ids are translated, not dropped.
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#
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# Both behaviors were real foot-guns: a run where NOTHING was collected printed
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# "0 tests passed, 0 failed (100% complete)" (reads green), and a pytest node id
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# (`file.py::Class::test`) was silently discarded by path discovery so the run
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# ended with "No test files to run" while looking like an accepted selector.
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def test_zero_collected_across_run_fails_and_says_so(tmp_path: Path) -> None:
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"""A -k that matches nothing must FAIL, not report a green summary."""
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probe_dir = _make_probe_dir(tmp_path)
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proc = _run_runner(probe_dir, "-k", "zzz_matches_nothing")
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assert proc.returncode == 1, proc.stdout
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assert "NO TESTS RAN" in proc.stdout
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assert "NOT a pass" in proc.stdout
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@pytest.mark.parametrize("form,expected", [
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("positional", ["alpha", "beta"]), ("bare-k", ["alpha"]),
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("node-id", ["alpha"]), ("explicit-k", ["beta"]),
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("pathsep", ["alpha", "beta", "gamma"]),
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])
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def test_runner_selection_records_actual_test_identity(tmp_path, form, expected):
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probe = tmp_path / "probe"
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other = tmp_path / "other"
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probe.mkdir()
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other.mkdir()
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receipt = tmp_path / "witnesses"
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receipt.mkdir()
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for directory, filename, names in ((probe, "test_flags.py", ["alpha", "beta"]),
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(other, "test_other.py", ["gamma"])):
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(directory / filename).write_text("from pathlib import Path\n" + "".join(
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f"def test_{name}():\n Path({str(receipt / name)!r}).touch()\n" for name in names
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), encoding="utf-8")
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target = str(probe / "test_flags.py")
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arguments = {
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"positional": [str(probe), "-q"],
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"bare-k": ["--paths", str(probe), "-k", "test_alpha"],
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"node-id": [target + "::test_alpha"],
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"explicit-k": [target + "::test_alpha", "-k", "test_beta"],
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"pathsep": ["--paths", os.pathsep.join([str(probe), str(other)])],
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}[form]
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runner = _probe_root(tmp_path) / "scripts/run_tests_parallel.py"
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result = subprocess.run([sys.executable, str(runner), *arguments, "-j", "1", "--file-timeout", "30"],
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cwd=tmp_path, capture_output=True, text=True, encoding="utf-8", timeout=60)
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assert result.returncode == 0, result.stdout + result.stderr
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assert sorted(path.name for path in receipt.iterdir()) == expected
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@pytest.mark.platforms("posix") # POSIX signal death; Windows has no SIGSEGV exit
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def test_interpreter_crash_is_reported_as_a_crash_not_as_no_tests_ran(tmp_path: Path) -> None:
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"""A file whose interpreter dies by signal is classified as CRASHED (#113186).
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A native fault after some tests passed leaves no pytest summary line, so
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every count parses to 0. The runner used to file that under "no tests ran
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(collection/import error)" beneath a summary reading ``0 failed`` — two
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wrong diagnoses for one real bug. The crash must be named on the summary
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line and in the failure buckets, and the run must still exit non-zero.
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"""
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probe_dir = tmp_path / "probe"
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probe_dir.mkdir()
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(probe_dir / "test_probe_crash.py").write_text(
|
|
textwrap.dedent(
|
|
"""
|
|
import os, signal
|
|
|
|
def test_before():
|
|
assert True
|
|
|
|
def test_crash():
|
|
os.kill(os.getpid(), signal.SIGSEGV)
|
|
"""
|
|
)
|
|
)
|
|
|
|
proc = _run_runner(probe_dir, "--file-retries", "0")
|
|
|
|
assert proc.returncode != 0
|
|
assert "1 file CRASHED" in proc.stdout
|
|
assert "SIGSEGV" in proc.stdout
|
|
assert "where no tests ran" not in proc.stdout
|
|
assert "NO TESTS RAN" not in proc.stdout
|
|
|
|
|
|
# ── --files-from: file-backed explicit file lists ───────────────────────────
|
|
#
|
|
# --files carries the whole list as ONE argv element, and Linux caps a
|
|
# single argument at MAX_ARG_STRLEN (128 KiB) — a much smaller limit than
|
|
# ARG_MAX. The whole-suite list (~210 KB) dies with E2BIG in execve before
|
|
# the runner's first line runs. --files-from takes the same explicit list
|
|
# from a file (or stdin via '-'), one path per line, so the list is bounded
|
|
# by the filesystem instead of one argv element.
|
|
|
|
|
|
def test_files_from_runs_exactly_the_listed_files(tmp_path: Path) -> None:
|
|
"""A newline-separated list file bypasses discovery like --files."""
|
|
probe_dir = _make_probe_dir(tmp_path)
|
|
extra = tmp_path / "probe_extra"
|
|
extra.mkdir()
|
|
(extra / "test_extra.py").write_text("def test_extra():\n assert True\n")
|
|
|
|
list_file = tmp_path / "files.txt"
|
|
list_file.write_text(
|
|
f"{probe_dir / 'test_flagprobe.py'}\n\n{extra / 'test_extra.py'}\n",
|
|
encoding="utf-8",
|
|
)
|
|
|
|
# --paths points at the probe dir too; an explicit list must win and
|
|
# NOT discover the extra file by accident.
|
|
proc = _run_runner(probe_dir, "--files-from", str(list_file), "-q")
|
|
assert proc.returncode == 0, proc.stdout
|
|
assert "Running 2 test files" in proc.stdout, proc.stdout
|
|
assert "3 passed" not in proc.stdout, proc.stdout
|
|
|
|
|
|
def test_files_from_dash_reads_the_list_from_stdin(tmp_path: Path) -> None:
|
|
"""--files-from - reads the list from stdin."""
|
|
probe_dir = _make_probe_dir(tmp_path)
|
|
|
|
repo_root = Path(__file__).resolve().parent.parent.parent
|
|
runner = repo_root / "scripts" / "run_tests_parallel.py"
|
|
proc = subprocess.run(
|
|
[sys.executable, str(runner), "--files-from", "-",
|
|
"-j", "1", "--file-timeout", "30", "-q"],
|
|
input=f"{probe_dir / 'test_flagprobe.py'}\n",
|
|
cwd=repo_root, stdout=subprocess.PIPE, stderr=subprocess.STDOUT,
|
|
encoding="utf-8", errors="replace", timeout=60,
|
|
)
|
|
assert proc.returncode == 0, proc.stdout
|
|
assert "Running 1 test files" in proc.stdout, proc.stdout
|
|
assert "✓2" in proc.stdout or "2 passed" in proc.stdout, proc.stdout
|
|
|
|
|
|
def test_scratch_root_is_per_user(tmp_path: Path, monkeypatch) -> None:
|
|
"""Two users on one host must never share the runner's scratch root.
|
|
|
|
A fixed literal in a world-writable sticky dir belongs to whoever created it first: a
|
|
root-owned root (a container or system-service run) makes every later ``mkdtemp`` there
|
|
fail with EPERM for every other user, with no non-root way back.
|
|
"""
|
|
import importlib
|
|
|
|
scripts_dir = Path(__file__).resolve().parents[2] / "scripts"
|
|
monkeypatch.syspath_prepend(str(scripts_dir))
|
|
runner = importlib.import_module("run_tests_parallel")
|
|
|
|
# Exercise the non-/var/tmp arm so the probe never mints roots in the real shared dir.
|
|
# (Narrow: on 3.14 ``Path.is_dir()`` itself goes through ``os.path.isdir``.)
|
|
monkeypatch.setattr(runner.tempfile, "gettempdir", lambda: str(tmp_path))
|
|
real_isdir = os.path.isdir
|
|
monkeypatch.setattr(runner.os.path, "isdir",
|
|
lambda path: False if str(path) == "/var/tmp" else real_isdir(path))
|
|
|
|
monkeypatch.setattr(runner.os, "getuid", lambda: 1000)
|
|
mine = Path(runner._runner_scratch_root())
|
|
monkeypatch.setattr(runner.os, "getuid", lambda: 0)
|
|
theirs = Path(runner._runner_scratch_root())
|
|
|
|
assert mine != theirs
|
|
assert mine.is_dir() and theirs.is_dir()
|
|
assert mine.parent == tmp_path and theirs.parent == tmp_path
|
|
|
|
|
|
def test_off_host_note_names_platforms_specs_that_exclude_this_host(tmp_path: Path) -> None:
|
|
"""A green local run must say which platforms() tests were skipped and where
|
|
they run; specs are resolved (posix is not off-host on Linux or macOS)."""
|
|
probe_dir = _make_probe_dir(tmp_path)
|
|
(probe_dir / "test_gated.py").write_text(
|
|
"import pytest\n\n"
|
|
"@pytest.mark.platforms('not linux')\ndef test_elsewhere():\n assert True\n\n"
|
|
"@pytest.mark.platforms('posix')\ndef test_posix():\n assert True\n\n"
|
|
"@pytest.mark.platforms('windows')\ndef test_windows():\n assert True\n",
|
|
encoding="utf-8",
|
|
)
|
|
proc = _run_runner(probe_dir)
|
|
notes = [line for line in proc.stdout.splitlines() if "SKIPPED on this host" in line]
|
|
host = {"linux": "linux", "darwin": "macos", "win32": "windows"}[sys.platform]
|
|
off_host = {"windows"} - {host}
|
|
if host == "linux":
|
|
off_host.add("not linux")
|
|
if host == "windows":
|
|
off_host.add("posix")
|
|
assert {n.split("platforms(")[1].split(")")[0].strip("'") for n in notes} == off_host, proc.stdout
|
|
assert all("they run on the" in n for n in notes), proc.stdout
|
|
|
|
|
|
def test_slices_partition_the_suite_exactly_even_with_different_duration_caches(capsys) -> None:
|
|
"""Each CI slice job restores its own duration cache; the slices must still cover every file once."""
|
|
import importlib.util
|
|
|
|
spec = importlib.util.spec_from_file_location(
|
|
"rtp_slices", Path(__file__).resolve().parents[2] / "scripts" / "run_tests_parallel.py")
|
|
rtp = importlib.util.module_from_spec(spec)
|
|
spec.loader.exec_module(rtp)
|
|
root = Path("/repo")
|
|
files = [root / f"tests/t_{i:03d}.py" for i in range(101)]
|
|
caches = [{f"tests/t_{i:03d}.py": float(i) for i in range(101)}, {"tests/t_000.py": 500.0}, {}]
|
|
slices = [rtp._slice_files(list(reversed(files)) if i % 2 else files, i % 3 + 1, 3, caches[i % 3], root)
|
|
for i in range(3)]
|
|
assert sorted(f for s in slices for f in s) == sorted(files)
|