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Title: gh-138122: Add --subprocesses flag to profile child processes in tachyon by pablogsal · Pull Request #142636 · python/cpython · GitHub

Open Graph Title: gh-138122: Add --subprocesses flag to profile child processes in tachyon by pablogsal · Pull Request #142636 · python/cpython

X Title: gh-138122: Add --subprocesses flag to profile child processes in tachyon by pablogsal · Pull Request #142636 · python/cpython

Description: This adds the ability to automatically profile child processes spawned by the target when using the sampling profiler. When the --subprocesses flag is passed, a background monitor thread polls for new descendants of the target process and spawns separate profiler instances for each Python child it discovers. Each child profiler inherits the sampling options from the parent (interval, duration, thread selection, native frames, async-aware mode, output format) and writes to its own output file with the child's PID appended to the filename. There is a limit of 100 concurrent child profilers to prevent resource exhaustion when profiling applications that fork heavily. The --subprocesses flag is incompatible with --live mode since the curses interface cannot accommodate multiple concurrent profiler displays. This is useful for profiling applications that use multiprocessing, ProcessPoolExecutor, or other subprocess-based parallelism. Issue: gh-138122

Open Graph Description: This adds the ability to automatically profile child processes spawned by the target when using the sampling profiler. When the --subprocesses flag is passed, a background monitor thread polls for ...

X Description: This adds the ability to automatically profile child processes spawned by the target when using the sampling profiler. When the --subprocesses flag is passed, a background monitor thread polls for ...

Opengraph URL: https://github.com/python/cpython/pull/142636

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3e3c4e5 Fix _remote_debugging header include order and macOS compatibility pablogsal Dec 12, 2025 https://github.com/python/cpython/pull/142636/commits/3e3c4e5f7c9caaf77b95c0c419348f3436a01cfb
7dbf221 Add get_child_pids function to _remote_debugging module pablogsal Dec 12, 2025 https://github.com/python/cpython/pull/142636/commits/7dbf22111b03738faafd8f3193cd885adba15298
2d8c149 Add --children flag to profile child processes pablogsal Dec 12, 2025 https://github.com/python/cpython/pull/142636/commits/2d8c149b66ee32270f0314543f451529d6f543a4
e6ca9f9 Add tests for child process profiling pablogsal Dec 12, 2025 https://github.com/python/cpython/pull/142636/commits/e6ca9f9bdd40be837832656d76d3c7a96579dce8
238d4d0 Add NEWS entry pablogsal Dec 12, 2025 https://github.com/python/cpython/pull/142636/commits/238d4d0c4c63bfdfed60d521c256d44f4bbe807b
bc5dc46 Regenerate files pablogsal Dec 12, 2025 https://github.com/python/cpython/pull/142636/commits/bc5dc4651910dfcc78076790e2e48139e6080c43
a64cba3 Rename --children to --subprocesses pablogsal Dec 12, 2025 https://github.com/python/cpython/pull/142636/commits/a64cba30d27920d76245da9f5df55b80781bac9f
86cb186 Fix permission error in macOS pablogsal Dec 12, 2025 https://github.com/python/cpython/pull/142636/commits/86cb186c91d9a5ca3c78f07443ab323dd0466c5e
d104fe6 (almost) as fast as Pablo StanFromIreland Dec 12, 2025 https://github.com/python/cpython/pull/142636/commits/d104fe6c589d320a9db15836c4d38d4a8d86019b
173422f Merge pull request #117 from StanFromIreland/tachyon-subprocesses-ato… pablogsal Dec 14, 2025 https://github.com/python/cpython/pull/142636/commits/173422f320f1166d09a3aacdda2017cffc8fd6bd
63d63f0 fixup! Merge pull request #117 from StanFromIreland/tachyon-subproces… pablogsal Dec 14, 2025 https://github.com/python/cpython/pull/142636/commits/63d63f0f892aec07167d5fa9f89bfa383a5040aa
42d5119 Simplify windows pablogsal Dec 14, 2025 https://github.com/python/cpython/pull/142636/commits/42d5119c571b4dfa76f7c7d2cafdfaf0b553b355
2ff40fc reduce indentation pablogsal Dec 14, 2025 https://github.com/python/cpython/pull/142636/commits/2ff40fcd722aff89e043eab77f3497e99d846546
f25a1c4 Merge remote-tracking branch 'upstream/main' into tachyon-subprocesse… pablogsal Dec 14, 2025 https://github.com/python/cpython/pull/142636/commits/f25a1c438fa166d3a783698ee0fd085926eae3a0
1e1b794 Unify checks for subprocess permissions pablogsal Dec 14, 2025 https://github.com/python/cpython/pull/142636/commits/1e1b7949dbb4f0346ee97f46d3187d10de2143b1
ab1753e Merge branch 'main' into tachyon-subprocesses-atomic pablogsal Dec 14, 2025 https://github.com/python/cpython/pull/142636/commits/ab1753e780a59d83ff39269f546d4b608b40d667
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e187121 fixup! Apply suggestions from code review pablogsal Dec 15, 2025 https://github.com/python/cpython/pull/142636/commits/e187121f5d60003e81a82a3f30340889ff64793f
284c6ca fixup! fixup! Apply suggestions from code review pablogsal Dec 15, 2025 https://github.com/python/cpython/pull/142636/commits/284c6ca62cf37ecb5f2c75b2a92a29e6de7bf60a
82fe5c8 Merge branch 'main' into tachyon-subprocesses-atomic pablogsal Dec 15, 2025 https://github.com/python/cpython/pull/142636/commits/82fe5c8d0d383dd1c3d0ebdb5dd472897e1029d6
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