Description

brittanyrey

opened on Sep 1, 2026

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Summary

import pdb costs ~84 ms. The largest single contributor is asyncio at ~36 ms — imported for
exactly one call site.

Only import asyncio in pdb, if asyncio is actually being used by the program being debugged.

NOTE: initially this issue also included lazy imports optimizations, until @hugovk let me know that there was already a PR open to address that.

(PR is prepared)

Linked PRs

• gh-156774: Speed up pdb startup with asyncio guard #156775

Activity

1. brittanyrey

   added a commit that references this issue on Sep 1, 2026

   pythongh-156774: Point pdb lazy-import NEWS entry at the filed issue

   8d15fb1
2. aisk

   added

   type-featureA feature request or enhancementA feature request or enhancement

   performancePerformance or resource usagePerformance or resource usage

   stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directory

   on Sep 1, 2026
3. hugovk

   added a parent issue on Sep 1, 2026

   • Improve import time of various stdlib modules #154675
4. brittanyrey

   added a commit that references this issue on Sep 1, 2026

   pythongh-156774: Scope pdb change down to the asyncio import only

   89fccc3
5. brittanyrey

   changed the title [-]Optimize pdb with lazy imports + asyncio gating[/-] [+]Optimize pdb with asyncio gating[/+] on Sep 1, 2026
6. hugovk

   added a commit that references this issue on Sep 8, 2026

   gh-156774: Speed up pdb startup with asyncio guard (#156775)

   024b6bc
7. hugovk

   closed this as completedon Sep 8, 2026
8. maurycy

   added a commit that references this issue on Sep 10, 2026

   Merge branch 'main' into tachyon-native-callable

   e028ff5
9. clin1234

   added a commit that references this issue on Sep 12, 2026

   pythongh-156774: Speed up pdb startup with asyncio guard (python#156775)

   72e3dff
10. johnslavik

    added a commit that references this issue on Sep 14, 2026

    pythongh-156774: Speed up pdb startup with asyncio guard (python#156775)

    ec0299c

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