docs(wiki): add three-round analysis findings and Spec-1/2/3 designs

2026-07-11 07:45:51 -04:00
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+---
+type: design
+node_id: design:batch-tree-build
+title: "Spec-2 建树批量并行入口"
+date: 2026-07-11
+---
+
+# Spec-2 建树批量并行入口
+
+**完整设计**: [2026-07-11-batch-tree-build-design.md](2026-07-11-batch-tree-build-design.md)
+
+- **选定方案**: tools/build_trees.py + scripts/build_trees.sh；两层并发参数（video_concurrency=16 视频级 + api_concurrency=16 全局共享 Semaphore 注入 builder）；repair_trees 惯例的 progress.json 断点续跑与熔断阈值缩放
+- **被否方案**: 单一视频级信号量（API 并发不可控 16×16）；仅全局 API 信号量（磁盘 IO 无界）