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                # 火焰圖 火焰圖是定位疑難雜癥的神器,比如CPU占用高、內存泄漏等問題。特別是Lua級別的火焰圖,可以定位到函數和代碼級別。 下圖來自openresty的[官網](http://openresty.org/download/user-flamegraph.svg),顯示的是一個正常運行的openresty應用的火焰圖,先不用了解細節,有一個直觀的了解。 ![Alt text](https://box.kancloud.cn/2015-08-11_55c9ff577deda.png) 里面的顏色是隨機選取的,并沒有特殊含義。火焰圖的數據來源,是通過[systemtap](https://sourceware.org/systemtap/)定期收集。
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