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Title: gh-138122: Add differential flame graph by ivonastojanovic · Pull Request #145785 · python/cpython · GitHub

Open Graph Title: gh-138122: Add differential flame graph by ivonastojanovic · Pull Request #145785 · python/cpython

X Title: gh-138122: Add differential flame graph by ivonastojanovic · Pull Request #145785 · python/cpython

Description: Differential flame graphs compare two profiling runs and highlight where performance has changed. This makes it easier to detect regressions introduced by code changes and to verify that optimizations have the intended effect. The visualization renders the current profile with frame widths representing current time consumption. Color is then applied to show the difference relative to the baseline profile: red gradients indicate regressions, while blue gradients indicate improvements. Some call paths may disappear entirely between profiles. These are referred to as elided stacks and occur when optimizations remove code paths or when certain branches stop executing. When elided stacks are present, an "Elided" toggle is displayed, allowing the user to switch between the main differential view and a view showing only the removed paths. In the diff view, slow_function improved (blue) and fast_function regressed (red) compared to the baseline. medium_function was removed (shown in the elided stacks toggle) and new_function was added (purple). Differential view Elided view CC: @pablogsal @lkollar Issue: gh-138122 📚 Documentation preview 📚: https://cpython-previews--145785.org.readthedocs.build/

Open Graph Description: Differential flame graphs compare two profiling runs and highlight where performance has changed. This makes it easier to detect regressions introduced by code changes and to verify that optimizati...

X Description: Differential flame graphs compare two profiling runs and highlight where performance has changed. This makes it easier to detect regressions introduced by code changes and to verify that optimizati...

Opengraph URL: https://github.com/python/cpython/pull/145785

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65528db Add differential flame graph ivonastojanovic Mar 8, 2026 https://github.com/python/cpython/pull/145785/commits/65528db03d7bf2bc7cf0b001c2cb65153cfadc94
2d97700 Add news ivonastojanovic Mar 10, 2026 https://github.com/python/cpython/pull/145785/commits/2d977007408d3027195848a155c99c0b576d29af
6e642e4 Fix colors ivonastojanovic Mar 26, 2026 https://github.com/python/cpython/pull/145785/commits/6e642e42951b66564af366b5865ae0f56d54ea7d
37289cb Show diff in ms ivonastojanovic Mar 26, 2026 https://github.com/python/cpython/pull/145785/commits/37289cb00dc9be48d58521a495472f90a87211c1
edaac9f Refactor active flamegraph data retrieval ivonastojanovic Mar 26, 2026 https://github.com/python/cpython/pull/145785/commits/edaac9fcdf8d2f1c6adc253f0e83da2881ffb6f1
c2203d6 Improve tests ivonastojanovic Mar 27, 2026 https://github.com/python/cpython/pull/145785/commits/c2203d67695bca714095a29999919b52313e543e
afe2f4e Change removed functions color ivonastojanovic Mar 27, 2026 https://github.com/python/cpython/pull/145785/commits/afe2f4ebfcc5f28f7313ae7bb4d1b06b5af08532
c0d937f Fix opcode merging in inverted flamegraph view ivonastojanovic Mar 29, 2026 https://github.com/python/cpython/pull/145785/commits/c0d937f83fd842b49ab94d07a54fe5fd7e99772e
080d2c8 fixup! Improve tests ivonastojanovic Mar 29, 2026 https://github.com/python/cpython/pull/145785/commits/080d2c8edd442933052897984f23097df3029717
440d333 Merge branch 'main' into differential_flamegraph ivonastojanovic Mar 29, 2026 https://github.com/python/cpython/pull/145785/commits/440d333df875aef352781b1f9ad69102e4438578
f4928b9 Update Lib/profiling/sampling/stack_collector.py pablogsal Mar 29, 2026 https://github.com/python/cpython/pull/145785/commits/f4928b968ed2aef3ca95075ff6e0f65975567f82
5556396 Update Lib/profiling/sampling/stack_collector.py picnixz Mar 29, 2026 https://github.com/python/cpython/pull/145785/commits/5556396e855fe2580b5b2f278b7640d620249ed0
d515f73 Random fixes pablogsal Mar 29, 2026 https://github.com/python/cpython/pull/145785/commits/d515f731d3b315b4b74c12040ab5d468e9b5bcd8
f753071 Small fix to cli pablogsal Mar 29, 2026 https://github.com/python/cpython/pull/145785/commits/f7530714c8c5cc089218926d0ae80a8e678176fc
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