Denghui Dong da94023b02 [Profiler] Fix lost C call events problem in Python 3.12.0-3.12.4 (#155446) ...

Hi team,

Please help review this patch.

This PR https://github.com/pytorch/pytorch/pull/150370 tried to fix the "Empty C Call Queue" problem on Python 3.12. It added C calls for each starting Python event with a callable.

I found the root cause is not that we cannot get C function frames by `PyFrame_GetBack` when PythonTracer is filling start frames, but the c call event loss problem bug on Python 3.12.0-3.12.4. And that problem was fixed by 257c413cd1 on 3.12.5.

So I think the https://github.com/pytorch/pytorch/pull/150370 cannot fix the problem, this patch reverts the change of it.

There are solutions to fix the problem correctly, such as we can add a new monitoring callback to compensate call events of methods with C function or we can override the callback registered by `PyEval_SetProfile`.  These solutions may make the code hard to maintain.

~~Since upgrading the micro version of Python is not difficult for users, we can just ignore C functions and suggest user upgrade.~~

Pull Request resolved: https://github.com/pytorch/pytorch/pull/155446
Approved by: https://github.com/sraikund16, https://github.com/cyyever

2025-07-23 20:03:52 +00:00

..

_internal

[Profiler] Fix lost C call events problem in Python 3.12.0-3.12.4 (#155446)

2025-07-23 20:03:52 +00:00

__init__.py

[BE][Easy][19/19] enforce style for empty lines in import segments in torch/[o-z]*/ (#129771)

2024-08-01 17:07:14 +00:00

_comparison.py

[Torch] Fix error message formatting in fp8 comparison logic (#153647)

2025-05-27 02:51:05 +00:00

_creation.py

PEP585 update - torch/testing (#145200)

2025-01-20 22:42:42 +00:00

_utils.py

Fix code descriptions in the test package. (#148145)

2025-03-04 19:14:41 +00:00