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Title: gh-146256: Add `--jsonl` collector to the `profiling.sampling` by maurycy · Pull Request #146257 · python/cpython · GitHub

Open Graph Title: gh-146256: Add `--jsonl` collector to the `profiling.sampling` by maurycy · Pull Request #146257 · python/cpython

X Title: gh-146256: Add `--jsonl` collector to the `profiling.sampling` by maurycy · Pull Request #146257 · python/cpython

Description: This PR adds --jsonl discussed in #146256. The aim is to introduce a subset of JSONL format that will be also used in streaming. I made some decisions but highlighted possible questions in the above PR. The class is below 2**8 lines of code and does not touch existing profiling.sampling code, so I took a leap. Usage macOS: sudo -E \ uv run \ --python /Users/maurycy/src/github.com/maurycy/cpython/python.exe \ python \ -m profiling.sampling \ run \ --jsonl \ -o /tmp/profile.jsonl /tmp/hello_world.py Where /tmp/hello_world.py could be: import time print("Hello, World!") time.sleep(0.1) Visual Studio Code Extension For the purpose of demonstrating the --jsonl usefulness, I have vibe-coded (with Claude Code) a simple VSCode Extension (only that) that displays a JSONL profile in the editor: I think that, once we have --stream it will be much more exciting. Apart from headless profilers: updating the real-time hot spots from the production in VSCode, or, well, making agents' life easier. You can fetch the vibe-coded VSCode Extension here (no guarantees): https://gist.github.com/maurycy/50a80586636a90216efc86065bbfd6de https://gist.github.com/maurycy/fa4c3acd9e8e681a609bddc9ad04c4ae Or: mkdir -p ~/.vscode/extensions/profiling-heatmap curl -sL 'https://gist.githubusercontent.com/maurycy/50a80586636a90216efc86065bbfd6de/raw/719e46f4f086c819edbbee7b20c45c41eae15e8b/extension.js' -o ~/.vscode/extensions/profiling-heatmap/extension.js curl -sL 'https://gist.githubusercontent.com/maurycy/fa4c3acd9e8e681a609bddc9ad04c4ae/raw/1edd3c2716a4a9e55aba8ed94850fd70f61fa606/package.json' -o ~/.vscode/extensions/profiling-heatmap/package.json echo "Restart VSCode, then: Cmd+Shift+P -> 'Profiling: Load JSONL Profile'" Please do not forget about removing ~/.vscode/extensions/profiling-heatmap/ after tests. Issue: gh-146256

Open Graph Description: This PR adds --jsonl discussed in #146256. The aim is to introduce a subset of JSONL format that will be also used in streaming. I made some decisions but highlighted possible questions in the abov...

X Description: This PR adds --jsonl discussed in #146256. The aim is to introduce a subset of JSONL format that will be also used in streaming. I made some decisions but highlighted possible questions in the abov...

Opengraph URL: https://github.com/python/cpython/pull/146257

X: @github

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gh-146256: Add --jsonl collector to the profiling.sampling https://github.com/python/cpython/pull/146257/changes#top
Show all changes 41 commits https://github.com/python/cpython/pull/146257/files
65312d5 first stab maurycy Mar 21, 2026 https://github.com/python/cpython/pull/146257/commits/65312d5fbcccb15f4e61d31c3373a6fb395e9bbd
dff2ead s/ndjson/jsonl/ maurycy Mar 21, 2026 https://github.com/python/cpython/pull/146257/commits/dff2ead5e96a49230bb5b4388ae66a035ab4fbd3
23b5df1 printing to stdout isn't a great idea maurycy Mar 22, 2026 https://github.com/python/cpython/pull/146257/commits/23b5df1d374d0a954160ae75d4cee44acea244d9
9cdb971 even a basic test maurycy Mar 30, 2026 https://github.com/python/cpython/pull/146257/commits/9cdb9710b8b6854e5b78b3b207fae6ffe8c1c943
5920559 separate func for end record maurycy Mar 30, 2026 https://github.com/python/cpython/pull/146257/commits/5920559f3e2484bb6ef2ccaf3f5b3a133467e446
28ebd2a proper name maurycy Mar 30, 2026 https://github.com/python/cpython/pull/146257/commits/28ebd2a64b2ca060c064e6fd207ed03a3af7556f
bc3370b test_jsonl_collector_with_location_info maurycy Mar 31, 2026 https://github.com/python/cpython/pull/146257/commits/bc3370b083fe42a2687539ff937c263aca5629fd
a151578 test synthetic frames maurycy Mar 31, 2026 https://github.com/python/cpython/pull/146257/commits/a151578460b53530ca86c00d7c93a2be00d840d9
f851de9 too many new lines maurycy Mar 31, 2026 https://github.com/python/cpython/pull/146257/commits/f851de9c9490ac970296ddc97d143efe59393c0a
e5831a8 BUG? confusing... two ways to set skip_idle? maurycy Mar 31, 2026 https://github.com/python/cpython/pull/146257/commits/e5831a8cb7c38db37bae5d3211669277595236b5
9c106a4 ok, thx b4fac15613a16f9cd7b2ee32840523b399f4621f maurycy Mar 31, 2026 https://github.com/python/cpython/pull/146257/commits/9c106a4075ec885fa7e3e89b04d97417bece2e34
727f05f check if it works fine with (file, loc, func, op) maurycy Mar 31, 2026 https://github.com/python/cpython/pull/146257/commits/727f05f3eb16f0d0d373d2fc373ae8a0bcdd8910
1c6f81a missing new line maurycy Mar 31, 2026 https://github.com/python/cpython/pull/146257/commits/1c6f81a45d61b6b53c558343c0edc9589c649fb2
c278f83 filter out sync coordinator maurycy Mar 31, 2026 https://github.com/python/cpython/pull/146257/commits/c278f83476b3c412e47721d06040e3cc61c288b5
bf6b454 s/collapsed_out/jsonl_out/, less copying :D maurycy Mar 31, 2026 https://github.com/python/cpython/pull/146257/commits/bf6b4547dca2cc40ecd0535b8081e7a82a1fa950
9ef96f8 nicer reading maurycy Mar 31, 2026 https://github.com/python/cpython/pull/146257/commits/9ef96f82e7c7711fa05e0b114a39c46e8f58601b
13dd0f2 typo maurycy Mar 31, 2026 https://github.com/python/cpython/pull/146257/commits/13dd0f2b03e5b9707d6a250f74a57f73bb366d2a
ae7afe1 too much copying, left-over maurycy Mar 31, 2026 https://github.com/python/cpython/pull/146257/commits/ae7afe1fa4ddb415ead8dc11833cb7dbcb84ad3e
a8eb46d just Counter maurycy Mar 31, 2026 https://github.com/python/cpython/pull/146257/commits/a8eb46d51ddafd04937cf8b2691fda191a620fd1
9982bb4 ruff maurycy Mar 31, 2026 https://github.com/python/cpython/pull/146257/commits/9982bb4283798578c2dcbadb0c3752177ee8593a
fe29888 future-proof name maurycy Mar 31, 2026 https://github.com/python/cpython/pull/146257/commits/fe298881656505963b2e9d49d3ab3362b7ee3abe
a5192b7 future-proof iter for streaming maurycy Mar 31, 2026 https://github.com/python/cpython/pull/146257/commits/a5192b77d2f56391290780a48771906bc21f64d5
1d53e16 truth to be told, this should be layer above maurycy Mar 31, 2026 https://github.com/python/cpython/pull/146257/commits/1d53e16b5a634fdea156649cd624b702c5947cfe
4b477c0 helper maurycy Mar 31, 2026 https://github.com/python/cpython/pull/146257/commits/4b477c0dacc1eb0ab93342de4757a6fae41c0ebd
e14f6f1 reorder maurycy Mar 31, 2026 https://github.com/python/cpython/pull/146257/commits/e14f6f17a1c2062519db71f8d21ffda159c28a41
cf6aa9e eh, just copy from heatmap maurycy Mar 31, 2026 https://github.com/python/cpython/pull/146257/commits/cf6aa9e296d42b19ba496bae23ee44b4e26a077f
1f4c766 smaller chunk; matter of taste maurycy Mar 31, 2026 https://github.com/python/cpython/pull/146257/commits/1f4c7660eabae2dbc8b07e72cbf3e71f47006deb
ba5712e test actual chunking maurycy Mar 31, 2026 https://github.com/python/cpython/pull/146257/commits/ba5712e2d47eb8b9ffaac180619a7b3dc3ccbd4b
3cacc30 test edge cases maurycy Mar 31, 2026 https://github.com/python/cpython/pull/146257/commits/3cacc309140da450a9963b7d77c8c0e7ebe55ca9
4d48f58 ruff maurycy Mar 31, 2026 https://github.com/python/cpython/pull/146257/commits/4d48f5838dc826c93682683a3799d96504810090
3ea253b match pep8 maurycy Mar 31, 2026 https://github.com/python/cpython/pull/146257/commits/3ea253bba7bcb0b3cc0cc607a817873375e233d0
308ca86 style maurycy Mar 31, 2026 https://github.com/python/cpython/pull/146257/commits/308ca86e221d7ab1a289a490bbe341e89a98f051
0db38a1 too defensive maurycy Mar 31, 2026 https://github.com/python/cpython/pull/146257/commits/0db38a1bbe2f11702638c78f50a97c59efb5b68a
4c768b4 too many style changes maurycy Mar 31, 2026 https://github.com/python/cpython/pull/146257/commits/4c768b4f135cfc07549d30220c6a04e160a04a2f
5e86f4f less style maurycy Mar 31, 2026 https://github.com/python/cpython/pull/146257/commits/5e86f4f8e7cbeeaaf139347a99f0df60d649277e
25eb558 ha! even less style... maurycy Mar 31, 2026 https://github.com/python/cpython/pull/146257/commits/25eb558e98a16ca35a0e66e89219d601200955b7
d25b4d5 news maurycy Mar 31, 2026 https://github.com/python/cpython/pull/146257/commits/d25b4d506b9c93123389ba9b7c65fdb5e673a84f
0c0089a news: proper formatting maurycy Mar 31, 2026 https://github.com/python/cpython/pull/146257/commits/0c0089afa6f506242ff9d5699466181714e2fbc9
5690ddf claim credit! maurycy Apr 4, 2026 https://github.com/python/cpython/pull/146257/commits/5690ddf8354667aa904e6647faef07ca722afbb0
8e1d83b fixup! claim credit! pablogsal May 4, 2026 https://github.com/python/cpython/pull/146257/commits/8e1d83bb97942c7b8c0087847eb6e3714c6b7741
fb4a7c8 fixup! fixup! claim credit! pablogsal May 4, 2026 https://github.com/python/cpython/pull/146257/commits/fb4a7c85cecbad71ac983a3639ebddde34999f4d
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