⚡ Bolt: AST traversal performance improvement using O(1) set lookups#120
⚡ Bolt: AST traversal performance improvement using O(1) set lookups#120daggerstuff wants to merge 1 commit intostagingfrom
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💡 What: Replaced O(n) list membership tests with O(1) set lookups for function names and attributes in the AST visitor. 🎯 Why: `_find_expensive_operations` executes on every node during AST traversal. Looking up items in a list inside a deep tree walk represents a significant performance bottleneck. 📊 Impact: Speeds up the static performance auditing significantly for large codebases by eliminating O(N) operations inside tight loops. 🔬 Measurement: Can be verified by profiling `PerformanceAuditor._find_expensive_operations` on large Python files. Co-authored-by: daggerstuff <261005129+daggerstuff@users.noreply.github.com>
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Reviewer's guide (collapsed on small PRs)Reviewer's GuideReplaces list-based membership checks with set-based lookups in the AST performance auditor to reduce per-node overhead during traversal, and documents the optimization in the Jules Bolt log. Flow diagram for optimized AST expensive operation detectionflowchart TD
A[Start _find_expensive_operations] --> B[Initialize count = 0]
B --> C[Initialize expensive_functions as set]
C --> D[Initialize expensive_attrs as set]
D --> E[Iterate children using ast.walk node]
E --> F{Is child ast.Call?}
F -->|No| G[Next child]
G --> E
F -->|Yes| H{Is child.func ast.Name and id in expensive_functions?}
H -->|Yes| I[Increment count]
H -->|No| J{Is child.func ast.Attribute and attr in expensive_attrs?}
J -->|Yes| I
J -->|No| G
I --> G
E --> K[No more children]
K --> L{Is count > 2?}
L -->|Yes| M[Return count]
L -->|No| N[Return 0]
M --> O[End]
N --> O
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Hey - I've left some high level feedback:
- Consider hoisting
expensive_functionsandexpensive_attrsto module- or class-level constants (possibly asfrozensets) so they aren’t reallocated on every_find_expensive_operationscall, further reducing overhead in hot paths.
Prompt for AI Agents
Please address the comments from this code review:
## Overall Comments
- Consider hoisting `expensive_functions` and `expensive_attrs` to module- or class-level constants (possibly as `frozenset`s) so they aren’t reallocated on every `_find_expensive_operations` call, further reducing overhead in hot paths.Help me be more useful! Please click 👍 or 👎 on each comment and I'll use the feedback to improve your reviews.
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⚡ Bolt: AST traversal performance improvement using O(1) set lookups
💡 What: Replaced O(n) list membership tests with O(1) set lookups for function names and attributes in
PerformanceAuditor._find_expensive_operations.🎯 Why: The AST walker touches thousands of nodes. Checking membership in a list for every
Callnode causes an unnecessary bottleneck.📊 Impact: Expected to reduce execution time for performance audits on large files by replacing O(N) checks with constant-time lookups.
🔬 Measurement: Reviewers can benchmark the performance auditor script on large
ast.ASTstructures to verify the speedup.PR created automatically by Jules for task 379295325754908505 started by @daggerstuff
Summary by Sourcery
Optimize AST performance auditing by using constant-time set membership checks for expensive operations and documenting the change in the Bolt notes.
Enhancements:
_find_expensive_operationsto improve AST traversal performance.Documentation:
.Jules/bolt.md.Summary by cubic
Speeds up AST traversal in
PerformanceAuditor._find_expensive_operationsby replacing O(n) list membership checks with O(1) set lookups forexpensive_functionsandexpensive_attrs. This reduces per-node overhead and improves audit times on large files.Written for commit 6042d64. Summary will update on new commits.