⚡️ Speed up function cached_data_for_file by 21%
#10
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📄 21% (0.21x) speedup for
cached_data_for_fileinmodules/cache.py⏱️ Runtime :
7.97 milliseconds→6.60 milliseconds(best of9runs)📝 Explanation and details
The optimized code achieves a 20% speedup through two key improvements in the
cache()function:1. Early Return Optimization
The original code used
if not cache_obj:which evaluatesFalsefor empty collections andNone. The optimized version usesif cache_obj is not None:with an immediate return, avoiding the expensive lock acquisition path for 97% of calls (314 out of 322 cache hits). This reduces the critical path for cache hits from going through lock evaluation to a simple null check and return.2. Reduced File System Operations Under Lock
The optimized version moves
os.path.exists()andos.path.isfile()calls into local variables within the lock, eliminating repeated expensive disk operations. These filesystem calls are only executed once per subsection during cache initialization rather than being evaluated multiple times.Performance Impact by Test Case:
The line profiler confirms that the expensive
make_cache()operation (95-99% of cache function time) remains unchanged, while the hot path optimizations significantly reduce overhead for the common case of accessing existing caches.✅ Correctness verification report:
🌀 Generated Regression Tests and Runtime
To edit these changes
git checkout codeflash/optimize-cached_data_for_file-mha59g5wand push.