⚡️ Speed up method OidcCliPlugin.write_tokens_to_metadata by 44%#42
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The optimization adds a **type-aware concatenation strategy** that avoids unnecessary list conversion when the input `metadata` is already a list. **Key optimization:** - **Conditional type checking**: Added `if isinstance(metadata, list)` to detect when metadata is already a list - **Direct list concatenation**: When metadata is a list, uses `metadata + [tokens]` instead of `list(metadata) + [tokens]` - **Fallback preservation**: Non-list sequences (tuples, etc.) still use the original `list(metadata) + [tokens]` approach **Why this is faster:** - **Eliminates redundant conversion**: `list(metadata)` creates an unnecessary copy when metadata is already a list - **Reduces memory allocations**: Direct list concatenation (`+`) is more efficient than convert-then-concatenate - **CPU cycle savings**: Avoids the overhead of iterating through an existing list to create an identical copy **Performance characteristics:** - **Most effective** for list inputs (which appear common based on test cases) - **Neutral impact** for non-list sequences like tuples - **Scales well** with large metadata collections (1000+ entries) as it eliminates O(n) copying overhead - **43% speedup** demonstrates the significant cost of unnecessary list conversions in Python The optimization maintains identical behavior while providing substantial performance gains for the common case of list-based metadata.
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📄 44% (0.44x) speedup for
OidcCliPlugin.write_tokens_to_metadatainframework/py/flwr/cli/auth_plugin/oidc_cli_plugin.py⏱️ Runtime :
46.0 microseconds→32.0 microseconds(best of160runs)📝 Explanation and details
The optimization adds a type-aware concatenation strategy that avoids unnecessary list conversion when the input
metadatais already a list.Key optimization:
if isinstance(metadata, list)to detect when metadata is already a listmetadata + [tokens]instead oflist(metadata) + [tokens]list(metadata) + [tokens]approachWhy this is faster:
list(metadata)creates an unnecessary copy when metadata is already a list+) is more efficient than convert-then-concatenatePerformance characteristics:
The optimization maintains identical behavior while providing substantial performance gains for the common case of list-based metadata.
✅ Correctness verification report:
🌀 Generated Regression Tests and Runtime
To edit these changes
git checkout codeflash/optimize-OidcCliPlugin.write_tokens_to_metadata-mhcxyv43and push.