97 lines
3.9 KiB
Python
97 lines
3.9 KiB
Python
"""Bounded thread-pool map for the long jobs (output scan, thumbnails).
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Threads, not processes: this code runs inside ComfyUI's server, where forking
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a CUDA-initialised, multi-threaded process is unsafe and the spawn start
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method would re-import ComfyUI's main module in every child. Pillow releases
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the GIL while decoding, resizing and encoding, so threads still scale close
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to linearly for both jobs.
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Interpreter exit (#375): ``threading._shutdown`` shuts every thread pool
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(``submit`` then raises "cannot schedule new futures after interpreter
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shutdown") before it joins the non-daemon threads and long before the package
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teardown runs, while our daemon threads keep working. Measured on 3.12 and
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3.14, ``Thread.start`` still succeeds in that window; it is refused ("can't
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create new thread at interpreter shutdown") only once the interpreter is
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marked finalizing, after the ``atexit`` callbacks. ``refused_at_shutdown``
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recognises both; ``note_refusal`` logs one DEBUG line per place, with no
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traceback.
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"""
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import logging
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import threading
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from concurrent.futures import ThreadPoolExecutor
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from .exit_signal import checked
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SHUTDOWN_REFUSAL = "interpreter shutdown"
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_logger = logging.getLogger("prompt_manager.parallel")
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_noted = set()
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_noted_lock = threading.Lock()
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def refused_at_shutdown(error):
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"""Whether ``error`` is a thread or pool start refused at interpreter exit."""
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return isinstance(error, RuntimeError) and SHUTDOWN_REFUSAL in str(error)
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def note_refusal(logger, what):
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"""Log once per ``what``, at DEBUG and without a traceback, that ``what``
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was refused because the interpreter is exiting."""
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key = (logger.name, what)
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with _noted_lock:
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if key in _noted:
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return
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_noted.add(key)
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logger.debug(f"{what}: refused, the interpreter is exiting")
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def map_parallel(func, items, workers):
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"""Apply ``func`` to every item on up to ``workers`` threads, keeping order.
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``workers`` of 1 (or fewer) runs on the calling thread with no pool. An
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exception in ``func`` propagates to the caller, so callers that must
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survive bad input wrap ``func`` themselves. A pool refused at interpreter
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exit runs the items it did not start on the calling thread (#375). An item
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that has not started when the interpreter starts exiting raises
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ExitRequested instead (#376).
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"""
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func = checked(func)
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items = list(items)
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workers = max(1, int(workers or 1))
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if workers == 1 or len(items) <= 1:
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return [func(item) for item in items]
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max_workers = min(workers, len(items))
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with ThreadPoolExecutor(max_workers, thread_name_prefix="pm-worker") as pool:
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futures = []
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try:
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for item in items:
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futures.append(pool.submit(func, item))
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except RuntimeError as error:
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if not refused_at_shutdown(error):
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raise
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note_refusal(_logger, "A worker pool")
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# Drop what was queued but not started; it runs here instead.
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# (A refused Thread.start leaves its item queued without a future
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# here: it is cancelled too, unless a busy pool thread took it in
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# between, the one case where an item can run twice.)
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pool.shutdown(wait=True, cancel_futures=True)
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else:
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return [future.result() for future in futures]
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return _run_rest(func, items, futures)
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def _run_rest(func, items, futures):
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"""The pool's finished results, and every item it did not run, run here.
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After ``shutdown(cancel_futures=True)`` each submitted future either ran
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(its result or exception is kept) or was cancelled before it started.
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"""
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results = []
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for index, item in enumerate(items):
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future = futures[index] if index < len(futures) else None
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if future is not None and not future.cancelled():
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results.append(future.result())
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else:
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results.append(func(item))
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return results
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