⚡️ Speed up method AsyncCallInstrumenter.visit_ClassDef by 26% in PR #739 (get-throughput-from-output)
#744
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⚡️ This pull request contains optimizations for PR #739
If you approve this dependent PR, these changes will be merged into the original PR branch
get-throughput-from-output.📄 26% (0.26x) speedup for
AsyncCallInstrumenter.visit_ClassDefincodeflash/code_utils/instrument_existing_tests.py⏱️ Runtime :
17.4 milliseconds→13.9 milliseconds(best of141runs)📝 Explanation and details
The optimization achieves a 25% speedup by eliminating redundant AST node creation inside the loop.
Key change: The
timeout_decoratorAST node is now created once before the loop instead of being recreated for every test method that needs it. In the original code, this AST structure was built 3,411 times during profiling, consuming significant time in object allocation and initialization.Why this works: AST nodes are immutable once created, so the same
timeout_decoratorinstance can be safely appended to multiple method decorator lists. This eliminates:ast.Call()constructor callsast.Name()andast.Constant()object creationPerformance characteristics: The optimization is most effective for large test classes with many test methods (showing 24-33% improvements in tests with 500+ methods), while having minimal impact on classes with few or no test methods. This makes it particularly valuable for comprehensive test suites where classes commonly contain dozens of test methods.
The line profiler shows the AST node creation operations dropped from ~3,400 hits to just ~25 hits, directly correlating with the observed speedup.
✅ Correctness verification report:
🌀 Generated Regression Tests and Runtime
To edit these changes
git checkout codeflash/optimize-pr739-2025-09-22T19.41.32and push.