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                [TOC] ## 思考 編程時有很多死去很快 die young)的對象——經常創建一個對象馬上就銷毀了。基于mark- sweep的算法,會產生大量的碎片。而且大量的對象,如果是 die young的話,遍歷 root se就不劃算。 ![](https://img.kancloud.cn/99/1f/991fff7ff9deed2c14f61216262ac741_400x52.png) ## 基于復制的算法 ![](https://img.kancloud.cn/d3/3d/d33d7f1d82bfff86000fa22b2c0a24d9_400x323.png) 因為一般而言,活的越久的對象,還能活更久的可能性會更大 ## 拆分生代 ![](https://img.kancloud.cn/88/ae/88aea40602a1c83c8f53eeed78087564_400x172.png) 新生代基于復制算法,老生代基于Mark Swep 算法 ### java 的內存 ![](https://img.kancloud.cn/24/f7/24f7d44ba7bb1e38a6365a2e0c181e1a_400x112.png) - Eden 快速創建銷毀的區間 - s0 標識 survive(存活區)0,s1的對象比s0活下去的可能性更大 - s0,s1等區域塊慢了的時候在進行回收 - Tenured 老生代的用 Mark-Sweep 算法 - Permanent 永久存貨的區域 ### V8(node.js) ![](https://img.kancloud.cn/a2/c1/a2c138fe5cf23954ab693af241fd830e_400x219.png)
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