anti
74096b6df0
CoW measurement on CPython 3.14: forked idle child keeps ~71MB shared, dirties ~1MB private; working child ~26MB. PEP 683 immortal objects keep code/module pages clean so gc.freeze() is unnecessary (freeze==nofreeze). prefork.run_fleet: master imports the base floor once, forks one child per worker (own process/GIL, CoW-shared floor), reaps + restarts with backoff, graceful SIGTERM->SIGKILL shutdown. Not yet wired to a command (that lands when 1.2 picks the target worker set).
56 lines
1.7 KiB
Python
56 lines
1.7 KiB
Python
# SPDX-License-Identifier: AGPL-3.0-or-later
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"""Standalone driver for the prefork supervisor — runnable directly OR via
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tests/test_prefork.py (which execs it in a subprocess so no fork happens inside
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the pytest/xdist worker).
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python tests/prefork_driver.py <out_dir>
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Forks two fake workers under decnet.prefork.run_fleet:
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* "tick" — append a line every 0.2s forever (proves a worker runs & stays up)
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* "crasher" — write a marker then exit(1) (proves restart-on-crash)
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Runs for ~2s via stop_after, then shuts the fleet down. Writes results into
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<out_dir>; the caller asserts on them.
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"""
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from __future__ import annotations
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import os
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import sys
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import time
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# Running this file as a script puts its own dir (tests/) on sys.path[0], which
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# shadows the stdlib `logging` via tests/logging/. Drop it before importing
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# decnet (still importable — it's installed in the venv).
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if sys.path and os.path.basename(sys.path[0]) == "tests":
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sys.path.pop(0)
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from decnet.prefork import run_fleet # noqa: E402
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def main(out: str) -> None:
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tick_log = os.path.join(out, "tick.log")
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crash_log = os.path.join(out, "crash.log")
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def tick() -> None:
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while True:
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with open(tick_log, "a") as f:
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f.write("t\n")
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time.sleep(0.2)
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def crasher() -> None:
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with open(crash_log, "a") as f:
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f.write("c\n")
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time.sleep(0.15)
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os._exit(1)
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# Fast backoff so we observe multiple restarts inside the short window.
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run_fleet(
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{"tick": tick, "crasher": crasher},
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max_backoff=0.2,
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poll_interval=0.05,
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stop_after=2.0,
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)
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if __name__ == "__main__":
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main(sys.argv[1] if len(sys.argv) > 1 else ".")
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