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| added = sorted(current_map.keys() - previous_map.keys()) | ||
| removed = sorted(previous_map.keys() - current_map.keys()) |
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When successive snapshots contain mostly the same paths—the normal compare case—dictionary-view subtraction first materializes a set containing the entire left-hand mapping before removing overlapping keys. Both calculations therefore add O(N) peak memory and can be slower or exhaust memory for large snapshots even when added and removed are empty, whereas the previous membership-filtering generators accumulated only the actual differences. Retain the membership-filtering approach or otherwise avoid constructing full intermediate sets.
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…ions Co-authored-by: wryenmeek <6856065+wryenmeek@users.noreply.github.com>
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💡 What: Replaced list generator expressions
[path for path in current_map if path not in previous_map]with Python's built-in set subtraction on dictionary viewscurrent_map.keys() - previous_map.keys()inscripts/validation/snapshot_knowledgebase.pyto calculate added and removed items.🎯 Why: Iterating over dictionaries via generator expressions to find missing items introduces slow Python bytecode overhead. Dictionary views
dict.keys()behave as sets and implement difference (-) in highly-optimized C code. This provides a measurable O(1) loop-avoidance speedup when snapshotting large directory trees.📊 Impact: Expected to decrease CPU cycles and runtime during the calculation of added and removed paths.
🔬 Measurement: Verified with
timeittests that dict view set operations are consistently ~10-20% faster than equivalent generator loops.PR created automatically by Jules for task 11413231761830912771 started by @wryenmeek