⚡️ Speed up method APIRequestor._parse_retry_after_header by 37% - #10
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The optimized code achieves a **36% speedup** by restructuring the parsing logic to minimize redundant operations and avoid unnecessary work:
**Key optimizations:**
1. **Eliminated redundant dict lookups:** The original code called `response_headers.get("retry-after-ms", None)` inside a try-except block, then potentially looked up the same key again. The optimized version stores the result in `retry_ms_header` once and checks for `None` before attempting conversion.
2. **Avoided unnecessary string conversions:** The original code unconditionally called `str(response_headers.get("retry-after"))` even when the header might not exist or might be successfully parsed as a float. The optimized version only converts to string when needed for date parsing.
3. **Reduced exception handling overhead:** By checking `if retry_ms_header is not None` and `if retry_header is not None` before attempting type conversions, the optimized code avoids triggering `TypeError` exceptions when headers don't exist, which is expensive in Python.
4. **Streamlined control flow:** The optimized version has clearer conditional branches that short-circuit when values are `None`, avoiding unnecessary processing steps.
**Performance benefits by test case:**
- **Empty headers or missing keys:** Faster due to fewer exception catches and string conversions
- **Valid numeric headers:** Faster due to single dict lookup and direct null checks
- **Date parsing fallback:** Still efficient but only executes when necessary
The line profiler shows the optimized version spends less time on dict lookups (14.1% vs 19.9%) and has better distributed execution across fewer code paths.
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📄 37% (0.37x) speedup for
APIRequestor._parse_retry_after_headerinsrc/together/abstract/api_requestor.py⏱️ Runtime :
9.54 microseconds→6.97 microseconds(best of37runs)📝 Explanation and details
The optimized code achieves a 36% speedup by restructuring the parsing logic to minimize redundant operations and avoid unnecessary work:
Key optimizations:
Eliminated redundant dict lookups: The original code called
response_headers.get("retry-after-ms", None)inside a try-except block, then potentially looked up the same key again. The optimized version stores the result inretry_ms_headeronce and checks forNonebefore attempting conversion.Avoided unnecessary string conversions: The original code unconditionally called
str(response_headers.get("retry-after"))even when the header might not exist or might be successfully parsed as a float. The optimized version only converts to string when needed for date parsing.Reduced exception handling overhead: By checking
if retry_ms_header is not Noneandif retry_header is not Nonebefore attempting type conversions, the optimized code avoids triggeringTypeErrorexceptions when headers don't exist, which is expensive in Python.Streamlined control flow: The optimized version has clearer conditional branches that short-circuit when values are
None, avoiding unnecessary processing steps.Performance benefits by test case:
The line profiler shows the optimized version spends less time on dict lookups (14.1% vs 19.9%) and has better distributed execution across fewer code paths.
✅ Correctness verification report:
🔎 Concolic Coverage Tests and Runtime
codeflash_concolic_atws5rsq/tmpjhs12g13/test_concolic_coverage.py::test_APIRequestor__parse_retry_after_headercodeflash_concolic_atws5rsq/tmpjhs12g13/test_concolic_coverage.py::test_APIRequestor__parse_retry_after_header_2codeflash_concolic_atws5rsq/tmpjhs12g13/test_concolic_coverage.py::test_APIRequestor__parse_retry_after_header_3codeflash_concolic_atws5rsq/tmpjhs12g13/test_concolic_coverage.py::test_APIRequestor__parse_retry_after_header_4To edit these changes
git checkout codeflash/optimize-APIRequestor._parse_retry_after_header-mgzuus6uand push.