Always use the suggestion mode for no-member / c-extension-no-member

[Pierre-Sassoulas]

Type of Changes

	Type
✓	🔨 Refactoring

Description

Work in progress to know what others think. There's no reason to add to not suggest imo (?), so we can remove the option too in the spirit of simplification.

[DanielNoord]

I agree with the change! Do we need tests?

[jacobtylerwalls]

Principle makes sense to me.

[jacobtylerwalls]

Could you share a profile run for a project like pylint or astroid and let us know the total time spent in _similar_names? That might impact whether we want to lru_cache it, potentially after fiddling with when attname is filtered out. Let me know if I'm speaking in too much shorthand.

[Pierre-Sassoulas]

Hurgh, took ~=50mn to lint pandas (I keyboard interrupted), but I didn't manage to format the output properly for snakeviz so no cool pictures available, but anyway the info about _similar_names:

   Ordered by: cumulative time

   ncalls  tottime  percall  cumtime  percall filename:lineno(function)
         1    0.000    0.000 2997.168 2997.168 __main__.py:1(<module>)
...
      571    0.952    0.002   85.079    0.149 typecheck.py:171(_similar_names)

Looks like it's 2.80% of total time, not insignificant.. (50% of the time seems to be spent in calculating string distances).

[jacobtylerwalls]

Thanks. I also just tried with django, a codebase where I expect no-member would fire a lot (hence pylint-django) and got similar results.

Without caching:
1.923s out of 44.409s total (4.3% of time)

With lru_cache():
CacheInfo(hits=168, misses=239, maxsize=512, currsize=239)
1.328s out of 43.122s total (3% of time)

Seems worth it? Maybe a maxsize of 256 or so?

[Pierre-Sassoulas]

I would have expected the cache to do better than that. Did you use the default ? And on what function ? Maybe it's more impactful to cache the string distance function than the function with the information about the instance. We definitely should cache in any case. (Also, you seem to have a vastly better computer than mine haha, linting Django in 45s ! :star-eyes:)

[jacobtylerwalls]

Did you use the default ?

I increased to maxsize=512, but as you can see the cache only ever grew to 239. Makes sense, there will only ever be so many no-member errors in a mature code base.

And on what function ?

_similar_names()

[jacobtylerwalls]

Thanks. I also just tried with django, a codebase where I expect no-member would fire a lot (hence pylint-django) and got similar results.

Without caching:
1.923s out of 44.409s total (4.3% of time)

With lru_cache():
CacheInfo(hits=168, misses=239, maxsize=512, currsize=239)
1.328s out of 43.122s total (3% of time)

Seems worth it? Maybe a maxsize of 256 or so?

[github-actions]

🤖 According to the primer, this change has no effect on the checked open source code. 🤖🎉

This comment was generated for commit d2abf8d