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Bug description:
That started within the last 48 hours, on the main branch. Here's test code; it's possible it could be simplified
if1:classObj:def__init__(self,i):self.val=iimportsysprint(sys.version)fromtimeimportperf_counterasnowstart=now()xs= [Obj(i)foriinrange(2**21)]finish=now()print(finish-start)
Under 3.12.2 it takes about a second, but under current main about 21 seconds.
C:\Code\Python\PCbuild>py \MyPy\small.py3.12.2 (tags/v3.12.2:6abddd9, Feb 6 2024, 21:26:36) [MSC v.1937 64 bit (AMD64)]0.9562742999987677C:\Code\Python\PCbuild>amd64\python.exe \MyPy\small.py3.13.0a5+ (heads/main:f4cc77d494, Mar 20 2024, 20:28:50) [MSC v.1939 64 bit (AMD64)]20.99507549998816If the size of the list is increased, it appears to suffer much worse than linear-time slowdown.
CPython versions tested on:
CPython main branch
Operating systems tested on:
Windows
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Done