Skip to content

Conversation

@codeflash-ai
Copy link
Contributor

@codeflash-ai codeflash-ai bot commented Aug 8, 2025

📄 36% (0.36x) speedup for mysorter in codeflash/bubble_sort.py

⏱️ Runtime : 3.96 microseconds 2.92 microseconds (best of 26628 runs)

📝 Explanation and details

The optimization replaces the manual bubble sort implementation with Python's built-in arr.sort() method, resulting in a 35% speedup.

Key Changes:

  • Eliminated the nested for loops that implemented bubble sort (O(n²) complexity)
  • Replaced with arr.sort() which uses Timsort algorithm (O(n log n) complexity)
  • Removed manual element swapping logic

Why This Is Faster:

  1. Algorithm efficiency: Bubble sort requires O(n²) comparisons and swaps, while Timsort is O(n log n) on average
  2. Native implementation: Python's sort() is implemented in optimized C code, avoiding Python interpreter overhead for the sorting logic
  3. Reduced function calls: The line profiler shows the original code made 130+ hits across sorting lines, while the optimized version makes only 2 hits to arr.sort()

Performance Impact:

  • Original: 50 microseconds total time with heavy computation in nested loops
  • Optimized: 33 microseconds total time with minimal sorting overhead
  • The sorting operation itself dropped from ~16 microseconds (multiple loop iterations) to just 2 microseconds

This optimization is particularly effective for larger arrays where the O(n²) vs O(n log n) difference becomes more pronounced, though even small arrays benefit from the native C implementation speed.

Correctness verification report:

Test Status
⚙️ Existing Unit Tests 🔘 None Found
🌀 Generated Regression Tests 🔘 None Found
⏪ Replay Tests 1 Passed
🔎 Concolic Coverage Tests 🔘 None Found
📊 Tests Coverage 100.0%
⏪ Replay Tests and Runtime
Test File::Test Function Original ⏱️ Optimized ⏱️ Speedup
test_UserscodeflashDownloadscodeflashdevcodeflashcodeflashbubble_sort_py__replay_test_0.py::test_codeflash_bubble_sort_mysorter 3.96μs 2.92μs ✅35.7%

To edit these changes git checkout codeflash/optimize-mysorter-me37k012 and push.

Codeflash

The optimization replaces the manual bubble sort implementation with Python's built-in `arr.sort()` method, resulting in a **35% speedup**.

**Key Changes:**
- Eliminated the nested `for` loops that implemented bubble sort (O(n²) complexity)
- Replaced with `arr.sort()` which uses Timsort algorithm (O(n log n) complexity)
- Removed manual element swapping logic

**Why This Is Faster:**
1. **Algorithm efficiency**: Bubble sort requires O(n²) comparisons and swaps, while Timsort is O(n log n) on average
2. **Native implementation**: Python's `sort()` is implemented in optimized C code, avoiding Python interpreter overhead for the sorting logic
3. **Reduced function calls**: The line profiler shows the original code made 130+ hits across sorting lines, while the optimized version makes only 2 hits to `arr.sort()`

**Performance Impact:**
- Original: 50 microseconds total time with heavy computation in nested loops
- Optimized: 33 microseconds total time with minimal sorting overhead
- The sorting operation itself dropped from ~16 microseconds (multiple loop iterations) to just 2 microseconds

This optimization is particularly effective for larger arrays where the O(n²) vs O(n log n) difference becomes more pronounced, though even small arrays benefit from the native C implementation speed.
@codeflash-ai codeflash-ai bot added the ⚡️ codeflash Optimization PR opened by Codeflash AI label Aug 8, 2025
@codeflash-ai codeflash-ai bot requested a review from aseembits93 August 8, 2025 19:17
@aseembits93 aseembits93 closed this Aug 8, 2025
@codeflash-ai codeflash-ai bot deleted the codeflash/optimize-mysorter-me37k012 branch August 8, 2025 19:24
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment

Labels

⚡️ codeflash Optimization PR opened by Codeflash AI

Projects

None yet

Development

Successfully merging this pull request may close these issues.

2 participants