perf(ecs): per-frame copies, allocations and WASM crossings in run_systems and the zippers
維護者通常 1 天內回覆
還沒有人認領這個 Issue。
評估
- 難度
- 4/5
- 預估耗時
- 3-5 天
- 新手友好度
- 42/100
- Issue 類型
- 功能
- 描述清晰度
- 基本清楚
- 活躍度
- 活躍
- 技術堆疊
- cpp, wasm
- 領域
- game-dev, performance
研究方向
Read modules/ecs/wasm/Registry.hpp around lines 260–262 and 302–322 to trace run_systems and getZipper. First establish an e2e game performance measurement, since the issue says none has been taken. Compare the per-frame allocations and WASM crossings before and after the proposed caching and length-read changes; done means measured improvement without changing ECS behavior.
由索引模型根據 Issue 內容生成。
描述
Which package or utils is this feature request for?
ecs
Feature
The hottest path breaks the repo's rule against per-frame allocation, at a cost of entities × systems. Every frame copies the systems vector and creates a shared_from_this() JS wrapper per system. Each getZipper builds a std::map, a JS array and one JS object per matching entity, calls get_js_class_name twice per component (3–6 JS property reads each) and re-reads comps["length"] on each iteration. No measurement was taken yet.
Where:
Evidence:
std::vector<emscripten::val> systems_copy = _systems;
for (emscripten::val &system : systems_copy)
system(shared_from_this(), ctx);
Ideal solution or implementation
Copy the systems only when they change during a run, cache the class-name → array pointer lookup per constructor, and read length once. Measure before and after with the e2e game.
Alternative solutions or implementations
No response
Other context
Found during a code audit of main at be72076.
- 主要語言
- TypeScript
- 星號
- 7
- 分支
- 2
- 平均合併
- 1 天 17 小時
- 30 天內合併 PR
- 17
環境準備
- 沒有 Dockerfile 或 Docker Compose 檔案
- 有 Pull Request 範本
- 閱讀貢獻指南
從這裡開始
- 先讀完整個 Issue，再讀專案的貢獻指南。
- 在 Issue 下留言說明你要接手 —— 這能避免兩個人做同樣的事。
- Fork 儲存庫，在一個分支上完成修改。
- 送出 Pull Request，並在描述裡引用這個 Issue 編號。
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