Associate thread-local data/context with a faulthandler traceback
還沒有人認領這個 Issue。
評估
研究方向
從 faulthandler 模組開始，並查看連結的 Python-ideas 討論，以了解所提議的執行緒區域上下文及其限制。將函式和內容管理器範例與所要求的 traceback 輸出進行比較；要完成這項工作，需要就關聯和輸出上下文的 API 與行為達成共識。
由索引模型根據 Issue 內容生成。
描述
Feature or enhancement
I’d like to be able to associate a thread-local string with the faulthandler module.
Pitch
The faulthandler module is invaluable for tracking down segfaults in native code, however it is really lacking the ability to add some kind of useful breadcumb to aide debugging. Imagine you are running a large-scale distributed job over tens of millions of images and a single one causes opencv to segfault reliably. This can be very difficult to track down.
It would be very useful to be able to add a string (limited by size) via the faulthandler module that is outputted along with the traceback. For example:
for image in millions_of_images():
faulthandler.context(f'{image.id=}')
segfaulty_function(image)
# Or maybe:
for image in millions_of_images():
with faulthandler.context(f'{image.id=}'):
segfaulty_function(image)
The traceback might be something like:
Fatal Python error: Segmentation fault
Current thread 0x00007fb899f39700 (most recent call first):
.... (traceback)
Segmentation fault
Context: image_id=foo
You could of course add logging to this function to print out the image ID before you run it through segfaulty_function, but if you're running this at high volume on a huge number of machines, this becomes a bit of an overhead, and it doesn't handle multiple threads running the function well.
Previous discussion
This is lifted from the following thread on Python-ideas: https://mail.python.org/archives/list/python-ideas@python.org/message/BG36W24KEEX4YJA7CZ3PGW4ISZGVXMH6/
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