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perf(mcp): let a pool without a default project retire its last idle worker - #424
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…worker Idle retirement kept one query worker alive in every pool. In a session with no default project, that worker held the projects it had opened through projectPath after the main thread released its own copies. Such a pool now retires every idle worker; warm() starts one again on the next call that names a project. A pool with a default project still keeps one. Measured on a session started outside any project that queried two projects by path, with both idle timeouts at 20 s: after 90 s idle the server's PSS fell from 179 MB to 68 MB and its threads from 13 to 6.
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ChangesIdle-worker retirement
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Review comments at @src/mcp/query-pool.ts:
- Line 240: Update the worker-retirement logic near the `this.workers.size`
check so that when retiring a worker leaves the pool with no workers, readiness
is reset. This lets the handler use its in-process path until a replacement
worker reports ready, while preserving readiness when workers remain.
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A pool that retired its last worker still reported ready, so the next call that named a project waited behind the replacement worker's cold start. Readiness now resets when the pool empties.
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Idle retirement in the MCP query pool kept one worker alive in every pool. In a session started outside any indexed project, that worker kept the projects it had opened through
projectPathafter the main thread had released its own copies (CODEGRAPH_PROJECT_IDLE_TIMEOUT_MS).A pool with no default project now retires every idle worker.
warm()(#419) starts one again on the next call that names a project, and calls run in-process until it is ready, as they already do. A pool with a default project still keeps one warm.Measurement
The session was started outside any project and queried two indexed projects by
projectPath, with both idle timeouts set to 20 s. Readings come from/proc/<pid>/smaps_rollup.With the pool disabled the same run settled at 65 MB PSS, so the remaining memory belongs to the main thread rather than the pool.
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vitest run: 673 files, 8599 tests passed.warm().Summary by CodeRabbit