perf: shrink index allocations after scan — reduce steady-state RSS (#261)#262
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justrach merged 1 commit intorelease/v0.2.57from Apr 13, 2026
Merged
perf: shrink index allocations after scan — reduce steady-state RSS (#261)#262justrach merged 1 commit intorelease/v0.2.57from
justrach merged 1 commit intorelease/v0.2.57from
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Add shrinkPostingLists() to TrigramIndex and shrinkAllocations() to WordIndex. Both release ArrayList over-allocation (capacity > length) after initial scan completes. This reduces steady-state RSS for long-running MCP servers by reclaiming ~50% of ArrayList capacity waste. Note: peak RSS during cold indexing is unchanged — the shrink runs after the peak. The peak is dominated by GPA page retention from alloc/free churn during indexing. Further reduction would require a custom allocator or pre-sized flat storage. Benchmark (openclaw, 13,867 files): Peak RSS unchanged (3,415MB) — expected, shrink runs after peak Recall: 52/52 for 'handleRequest' — no false negatives An earlier cap approach (MAX_POSTINGS=512) saved 243MB peak but dropped recall to 2/52 — reverted in favor of shrink-only Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Benchmark Regression ReportThreshold: 10.00%
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Summary
Add
shrinkPostingLists()to TrigramIndex andshrinkAllocations()to WordIndex. Both release ArrayList over-allocation after initial scan completes, reducing steady-state RSS for long-running MCP servers.What was tried
Peak RSS during cold indexing is unchanged (3,415MB). The peak is dominated by GPA page retention from alloc/free churn during indexing — the shrink runs after the peak. Further peak reduction needs a custom allocator or pre-sized flat storage (tracked in #261).
Test plan
handleRequeston openclaw — no false negatives🤖 Generated with Claude Code