Description

markshannon

opened on Jan 23, 2026

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As listed here: #139109 (comment)

Currently we use a bunch of ad-hoc tracking of objects in the tracing front-end to allow subsequent optimizations, we also maintain ancillary data structures for version number to object lookup for functions, code objects and classes.

This is all very fragile, complicated and inefficient.

By recording references to any necessary objects in the trace, we can:

• Eliminate optimization failures due to missing values in lookup caches
• Remove version lookup caches
• Remove ad-hoc handling of code objects around calls in the tracer
• Allow the tracer to record any references we feel are useful for optimization
• Remove tracking of dependencies during tracing

Linked PRs

• GH-144179: Add value recording to JIT tracing front-end #144303
• GH-144179: Use recorded values to make optimizer more robust #144437

Reacted by stonebig

Activity

1. markshannon

   added

   performancePerformance or resource usagePerformance or resource usage

   topic-JIT

   3.15bugs and security fixesbugs and security fixes

   on Jan 23, 2026
2. markshannon

   self-assigned this

   on Jan 23, 2026
3. markshannon

   added a commit that references this issue on Feb 2, 2026

   GH-144179: Add value recording to JIT tracing front-end (GH-144303)

   141fd8b
4. Aniketsy

   added a commit that references this issue on Feb 3, 2026

   pythonGH-144179: Add value recording to JIT tracing front-end (python…

   c6f9612
5. markshannon

   added a commit that references this issue on Feb 5, 2026

   GH-144179: Use recorded values to make optimizer more robust (GH-144437)

   b53fc7c
6. markshannon

   closed this as completedon Feb 5, 2026
7. encukou

   added a commit that references this issue on Feb 5, 2026

   pythonGH-144179: Use recorded values to make optimizer more robust (p…

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8. thunder-coding

   added 2 commits that reference this issue on Feb 15, 2026

   pythonGH-144179: Add value recording to JIT tracing front-end (python…

   b675ed3

   pythonGH-144179: Use recorded values to make optimizer more robust (p…

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9. ljfp

   added a commit that references this issue on Apr 25, 2026

   pythonGH-144179: Use recorded values to make optimizer more robust (p…

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