[issue47248] Possible slowdown of regex searching in 3.11

Ma Lin added the comment: > Possibly related to the new atomic grouping support from GH-31982? It seems not likely. I will do some benchmarks for this issue, more information (version/platform) is welcome. -- ___ Python tracker

[issue47248] Possible slowdown of regex searching in 3.11

Dennis Sweeney added the comment: Possibly related to the new atomic grouping support from GH-31982? -- nosy: +Dennis Sweeney, serhiy.storchaka ___ Python tracker ___

[issue47248] Possible slowdown of regex searching in 3.11

Ma Lin added the comment: Could you give the two versions? I will do a git bisect. I tested 356997c~1 and 356997c [1], msvc2022 non-pgo release build: # regex_dna ### an +- std dev: 151 ms +- 1 ms -> 152 ms +- 1 ms: 1.01x slower t significant # regex_effbot ### an +- std dev: 2.47 ms +-

[issue47248] Possible slowdown of regex searching in 3.11

New submission from Mark Shannon : The 3 regular expression benchmarks in the pyperformance suite, regex_v8, regex_effbot and regex_dna show slowdowns between 3% and 10%. Looking at the stats, nothing seems wrong with specialization or the memory optimizations. Which strongly suggests a