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perf(query): retire excess workers after idle bursts - #2862
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October 23, 2026 21:04
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A session grows its query pool for concurrent reads but retains every worker's heap and SQLite connection until shutdown. After a burst, an otherwise idle MCP server therefore keeps paying for the peak worker count.
Retire excess workers after 60 seconds idle, retain one warm worker, and regrow through the existing dispatch path. Active/starting workers are preserved, intentional retirement does not consume the crash budget, and shutdown awaits retirements already underway. No new public setting or dependency.
Validation on Linux/WSL, based on main 44adef8: all 28 query-pool tests passed, including real compiled workers, multi-project dispatch, failed-open recovery and teardown. The three added regressions cover repeated shrink/regrow, busy/starting workers, and shutdown during retirement. An installed MCP comparison on the maintained fork previously dropped idle RSS from about 673 MiB to 426 MiB while preserving source queries.
Windows x64 and macOS arm64 native builds and focused regressions also passed (39 tests on each platform, including the native scaffold). Cross-platform validation checks the exact PR head commit. This PR excludes the maintained-fork installer, runtime identity and workstation configuration.