⚡️ Speed up method MultipartUploadManager._get_file_type by 21% - #17
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The optimization replaces a chain of `if-elif-else` statements with a dictionary lookup using a try-except pattern. Instead of sequentially checking each file extension condition (which requires up to 3 comparisons in the worst case), the optimized version performs a single dictionary lookup operation.
**Key changes:**
- Replaced `if file.suffix == ".jsonl": elif file.suffix == ".parquet": elif file.suffix == ".csv":` with a dictionary mapping `{".jsonl": "jsonl", ".parquet": "parquet", ".csv": "csv"}`
- Used `try-except KeyError` pattern instead of final `else` clause for error handling
- Cached `file.suffix` in a variable to avoid repeated attribute access
**Why this is faster:**
Dictionary lookups in Python are O(1) average case operations using hash tables, while chained conditionals require O(n) sequential comparisons. Even with only 3 extensions, the dictionary approach eliminates the need for multiple string equality checks and reduces the number of attribute accesses to `file.suffix`.
The 20% speedup is achieved because:
1. Dictionary hash lookup is more efficient than sequential string comparisons
2. Single attribute access (`ext = file.suffix`) vs multiple accesses in conditionals
3. Fewer branching instructions in the CPU
This optimization is particularly beneficial when the method is called frequently with different file types, as the performance gain is consistent regardless of which extension is being processed.
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📄 21% (0.21x) speedup for
MultipartUploadManager._get_file_typeinsrc/together/filemanager.py⏱️ Runtime :
3.58 microseconds→2.96 microseconds(best of56runs)📝 Explanation and details
The optimization replaces a chain of
if-elif-elsestatements with a dictionary lookup using a try-except pattern. Instead of sequentially checking each file extension condition (which requires up to 3 comparisons in the worst case), the optimized version performs a single dictionary lookup operation.Key changes:
if file.suffix == ".jsonl": elif file.suffix == ".parquet": elif file.suffix == ".csv":with a dictionary mapping{".jsonl": "jsonl", ".parquet": "parquet", ".csv": "csv"}try-except KeyErrorpattern instead of finalelseclause for error handlingfile.suffixin a variable to avoid repeated attribute accessWhy this is faster:
Dictionary lookups in Python are O(1) average case operations using hash tables, while chained conditionals require O(n) sequential comparisons. Even with only 3 extensions, the dictionary approach eliminates the need for multiple string equality checks and reduces the number of attribute accesses to
file.suffix.The 20% speedup is achieved because:
ext = file.suffix) vs multiple accesses in conditionalsThis optimization is particularly beneficial when the method is called frequently with different file types, as the performance gain is consistent regardless of which extension is being processed.
✅ Correctness verification report:
⏪ Replay Tests and Runtime
🔎 Concolic Coverage Tests and Runtime
codeflash_concolic_atws5rsq/tmp5ztve0gt/test_concolic_coverage.py::test_MultipartUploadManager__get_file_typeTo edit these changes
git checkout codeflash/optimize-MultipartUploadManager._get_file_type-mgzxwtu2and push.