{"id":4818,"date":"2020-02-25T09:26:01","date_gmt":"2020-02-25T01:26:01","guid":{"rendered":"https:\/\/www.xttblog.com\/?p=4818"},"modified":"2020-02-25T09:26:01","modified_gmt":"2020-02-25T01:26:01","slug":"%e5%92%b1%e4%bb%ac%e4%bb%8e%e5%a4%b4%e5%88%b0%e5%b0%be%e8%af%b4%e4%b8%80%e6%ac%a1-java-%e5%9e%83%e5%9c%be%e5%9b%9e%e6%94%b6","status":"publish","type":"post","link":"https:\/\/www.xttblog.com\/?p=4818","title":{"rendered":"\u54b1\u4eec\u4ece\u5934\u5230\u5c3e\u8bf4\u4e00\u6b21 Java \u5783\u573e\u56de\u6536"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u4e4b\u524d\u4e0a\u5b66\u7684\u65f6\u5019\u6709\u8fd9\u4e2a\u4e00\u4e2a\u6897\uff0c\u8bf4\u5728\u98df\u5802\u91cc\u5403\u996d\uff0c\u5403\u5b8c\u628a\u9910\u76d8\u7aef\u8d70\u6e05\u7406\u7684\uff0c\u662f C++ \u7a0b\u5e8f\u5458\uff0c\u5403\u5b8c\u76f4\u63a5\u5c31\u8d70\u7684\uff0c\u662f Java \u7a0b\u5e8f\u5458\u3002<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/gitee.com\/xmtblog\/img\/raw\/master\/1582592754938.jpg\" alt=\"\" \/><figcaption>Java \u4e0e C \u7684\u533a\u522b<\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u786e\u5b9e\uff0c\u5728 Java \u7684\u4e16\u754c\u91cc\uff0c\u4f3c\u4e4e\u6211\u4eec\u4e0d\u7528\u5bf9\u5783\u573e\u56de\u6536\u90a3\u4e48\u7684\u4e13\u6ce8\uff0c\u5f88\u591a\u521d\u5b66\u8005\u4e0d\u61c2 GC\uff0c\u4e5f\u4f9d\u7136\u80fd\u5199\u51fa\u4e00\u4e2a\u80fd\u7528\u751a\u81f3\u8fd8\u4e0d\u9519\u7684\u7a0b\u5e8f\u6216\u7cfb\u7edf\u3002\u4f46\u5176\u5b9e\u8fd9\u5e76\u4e0d\u4ee3\u8868 Java \u7684 GC \u5c31\u4e0d\u91cd\u8981\u3002\u76f8\u53cd\uff0c\u5b83\u662f\u90a3\u4e48\u7684\u91cd\u8981\u548c\u590d\u6742\uff0c\u4ee5\u81f3\u4e8e\u51fa\u4e86\u95ee\u9898\uff0c\u90a3\u4e9b\u521d\u5b66\u8005\u9664\u4e86\u6253\u5f00 GC \u65e5\u5fd7\uff0c\u770b\u7740\u4e00\u58060101\u7684\u5929\u6587\uff0c\u5565\u4e5f\u505a\u4e0d\u4e86\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4eca\u5929\u6211\u4eec\u5c31\u4ece\u5934\u5230\u5c3e\u5b8c\u6574\u5730\u804a\u4e00\u804a Java \u7684\u5783\u573e\u56de\u6536\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4ec0\u4e48\u662f\u5783\u573e\u56de\u6536<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5783\u573e\u56de\u6536\uff08Garbage Collection\uff0cGC\uff09\uff0c\u987e\u540d\u601d\u4e49\u5c31\u662f\u91ca\u653e\u5783\u573e\u5360\u7528\u7684\u7a7a\u95f4\uff0c\u9632\u6b62\u5185\u5b58\u6cc4\u9732\u3002\u6709\u6548\u7684\u4f7f\u7528\u53ef\u4ee5\u4f7f\u7528\u7684\u5185\u5b58\uff0c\u5bf9\u5185\u5b58\u5806\u4e2d\u5df2\u7ecf\u6b7b\u4ea1\u7684\u6216\u8005\u957f\u65f6\u95f4\u6ca1\u6709\u4f7f\u7528\u7684\u5bf9\u8c61\u8fdb\u884c\u6e05\u9664\u548c\u56de\u6536\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Java \u8bed\u8a00\u51fa\u6765\u4e4b\u524d\uff0c\u5927\u5bb6\u90fd\u5728\u62fc\u547d\u7684\u5199 C \u6216\u8005 C++ \u7684\u7a0b\u5e8f\uff0c\u800c\u6b64\u65f6\u5b58\u5728\u4e00\u4e2a\u5f88\u5927\u7684\u77db\u76fe\uff0cC++ \u7b49\u8bed\u8a00\u521b\u5efa\u5bf9\u8c61\u8981\u4e0d\u65ad\u7684\u53bb\u5f00\u8f9f\u7a7a\u95f4\uff0c\u4e0d\u7528\u7684\u65f6\u5019\u53c8\u9700\u8981\u4e0d\u65ad\u7684\u53bb\u91ca\u653e\u63a7\u4ef6\uff0c\u65e2\u8981\u5199\u6784\u9020\u51fd\u6570\uff0c\u53c8\u8981\u5199\u6790\u6784\u51fd\u6570\uff0c\u5f88\u591a\u65f6\u5019\u90fd\u5728\u91cd\u590d\u7684 allocated\uff0c\u7136\u540e\u4e0d\u505c\u7684\u6790\u6784\u3002\u4e8e\u662f\uff0c\u6709\u4eba\u5c31\u63d0\u51fa\uff0c\u80fd\u4e0d\u80fd\u5199\u4e00\u6bb5\u7a0b\u5e8f\u5b9e\u73b0\u8fd9\u5757\u529f\u80fd\uff0c\u6bcf\u6b21\u521b\u5efa\uff0c\u91ca\u653e\u63a7\u4ef6\u7684\u65f6\u5019\u590d\u7528\u8fd9\u6bb5\u4ee3\u7801\uff0c\u800c\u65e0\u9700\u91cd\u590d\u7684\u4e66\u5199\u5462\uff1f<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">1960\u5e74\uff0c\u57fa\u4e8e MIT \u7684 Lisp \u9996\u5148\u63d0\u51fa\u4e86\u5783\u573e\u56de\u6536\u7684\u6982\u5ff5\uff0c\u800c\u8fd9\u65f6 Java \u8fd8\u6ca1\u6709\u51fa\u4e16\u5462\uff01\u6240\u4ee5\u5b9e\u9645\u4e0a GC \u5e76\u4e0d\u662fJava\u7684\u4e13\u5229\uff0cGC \u7684\u5386\u53f2\u8fdc\u8fdc\u5927\u4e8e Java \u7684\u5386\u53f2\uff01<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u600e\u4e48\u5b9a\u4e49\u5783\u573e<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u65e2\u7136\u6211\u4eec\u8981\u505a\u5783\u573e\u56de\u6536\uff0c\u9996\u5148\u6211\u4eec\u5f97\u641e\u6e05\u695a\u5783\u573e\u7684\u5b9a\u4e49\u662f\u4ec0\u4e48\uff0c\u54ea\u4e9b\u5185\u5b58\u662f\u9700\u8981\u56de\u6536\u7684\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u5f15\u7528\u8ba1\u6570\u7b97\u6cd5<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f15\u7528\u8ba1\u6570\u7b97\u6cd5\uff08Reachability Counting\uff09\u662f\u901a\u8fc7\u5728\u5bf9\u8c61\u5934\u4e2d\u5206\u914d\u4e00\u4e2a\u7a7a\u95f4\u6765\u4fdd\u5b58\u8be5\u5bf9\u8c61\u88ab\u5f15\u7528\u7684\u6b21\u6570\uff08Reference Count\uff09\u3002\u5982\u679c\u8be5\u5bf9\u8c61\u88ab\u5176\u5b83\u5bf9\u8c61\u5f15\u7528\uff0c\u5219\u5b83\u7684\u5f15\u7528\u8ba1\u6570\u52a01\uff0c\u5982\u679c\u5220\u9664\u5bf9\u8be5\u5bf9\u8c61\u7684\u5f15\u7528\uff0c\u90a3\u4e48\u5b83\u7684\u5f15\u7528\u8ba1\u6570\u5c31\u51cf1\uff0c\u5f53\u8be5\u5bf9\u8c61\u7684\u5f15\u7528\u8ba1\u6570\u4e3a0\u65f6\uff0c\u90a3\u4e48\u8be5\u5bf9\u8c61\u5c31\u4f1a\u88ab\u56de\u6536\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>String m = new String(\"jack\");<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5148\u521b\u5efa\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u8fd9\u65f6\u5019&#8221;jack&#8221;\u6709\u4e00\u4e2a\u5f15\u7528\uff0c\u5c31\u662f m\u3002<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/gitee.com\/xmtblog\/img\/raw\/master\/1582592740030.jpg\" alt=\"\" \/><figcaption>Java \u5b57\u7b26\u4e32\u7684\u5185\u5b58\u5730\u5740<\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u7136\u540e\u5c06 m \u8bbe\u7f6e\u4e3a null\uff0c\u8fd9\u65f6\u5019&#8221;jack&#8221;\u7684\u5f15\u7528\u6b21\u6570\u5c31\u7b49\u4e8e0\u4e86\uff0c\u5728\u5f15\u7528\u8ba1\u6570\u7b97\u6cd5\u4e2d\uff0c\u610f\u5473\u7740\u8fd9\u5757\u5185\u5bb9\u5c31\u9700\u8981\u88ab\u56de\u6536\u4e86\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>m = null;<\/code><\/pre>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/gitee.com\/xmtblog\/img\/raw\/master\/1582592769173.jpg\" alt=\"\" \/><figcaption>Java \u5b57\u7b26\u4e32\u5373\u5c06\u88ab\u56de\u6536<\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f15\u7528\u8ba1\u6570\u7b97\u6cd5\u662f\u5c06\u5783\u573e\u56de\u6536\u5206\u644a\u5230\u6574\u4e2a\u5e94\u7528\u7a0b\u5e8f\u7684\u8fd0\u884c\u5f53\u4e2d\u4e86\uff0c\u800c\u4e0d\u662f\u5728\u8fdb\u884c\u5783\u573e\u6536\u96c6\u65f6\uff0c\u8981\u6302\u8d77\u6574\u4e2a\u5e94\u7528\u7684\u8fd0\u884c\uff0c\u76f4\u5230\u5bf9\u5806\u4e2d\u6240\u6709\u5bf9\u8c61\u7684\u5904\u7406\u90fd\u7ed3\u675f\u3002\u56e0\u6b64\uff0c\u91c7\u7528\u5f15\u7528\u8ba1\u6570\u7684\u5783\u573e\u6536\u96c6\u4e0d\u5c5e\u4e8e\u4e25\u683c\u610f\u4e49\u4e0a\u7684&#8221;Stop-The-World&#8221;\u7684\u5783\u573e\u6536\u96c6\u673a\u5236\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u770b\u4f3c\u5f88\u7f8e\u597d\uff0c\u4f46\u6211\u4eec\u77e5\u9053 JVM \u7684\u5783\u573e\u56de\u6536\u5c31\u662f&#8221;Stop-The-World&#8221;\u7684\uff0c\u90a3\u662f\u4ec0\u4e48\u539f\u56e0\u5bfc\u81f4\u6211\u4eec\u6700\u7ec8\u653e\u5f03\u4e86\u5f15\u7528\u8ba1\u6570\u7b97\u6cd5\u5462\uff1f\u770b\u4e0b\u9762\u7684\u4f8b\u5b50\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public class ReferenceCountingGC {\n    public Object instance;\n    public ReferenceCountingGC(String name){}\n}\npublic static void testGC(){\n    ReferenceCountingGC a = new ReferenceCountingGC(\"objA\");\n    ReferenceCountingGC b = new ReferenceCountingGC(\"objB\");\n    a.instance = b;\n    b.instance = a;\n    a = null;\n    b = null;\n}<\/code><\/pre>\n\n\n\n<ol class=\"wp-block-list\"><li> \u5b9a\u4e492\u4e2a\u5bf9\u8c61<\/li><li>\u76f8\u4e92\u5f15\u7528<\/li><li>\u7f6e\u7a7a\u5404\u81ea\u7684\u58f0\u660e\u5f15\u7528 <\/li><\/ol>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/gitee.com\/xmtblog\/img\/raw\/master\/1582592781981.jpg\" alt=\"\" \/><figcaption>\u5185\u5b58\u6cc4\u9732<\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u6211\u4eec\u53ef\u4ee5\u770b\u5230\uff0c\u6700\u540e\u8fd92\u4e2a\u5bf9\u8c61\u5df2\u7ecf\u4e0d\u53ef\u80fd\u518d\u88ab\u8bbf\u95ee\u4e86\uff0c\u4f46\u7531\u4e8e\u4ed6\u4eec\u76f8\u4e92\u5f15\u7528\u7740\u5bf9\u65b9\uff0c\u5bfc\u81f4\u5b83\u4eec\u7684\u5f15\u7528\u8ba1\u6570\u6c38\u8fdc\u90fd\u4e0d\u4f1a\u4e3a0\uff0c\u901a\u8fc7\u5f15\u7528\u8ba1\u6570\u7b97\u6cd5\uff0c\u4e5f\u5c31\u6c38\u8fdc\u65e0\u6cd5\u901a\u77e5GC\u6536\u96c6\u5668\u56de\u6536\u5b83\u4eec\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u53ef\u8fbe\u6027\u5206\u6790\u7b97\u6cd5<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u53ef\u8fbe\u6027\u5206\u6790\u7b97\u6cd5\uff08Reachability Analysis\uff09\u7684\u57fa\u672c\u601d\u8def\u662f\uff0c\u901a\u8fc7\u4e00\u4e9b\u88ab\u79f0\u4e3a\u5f15\u7528\u94fe\uff08GC Roots\uff09\u7684\u5bf9\u8c61\u4f5c\u4e3a\u8d77\u70b9\uff0c\u4ece\u8fd9\u4e9b\u8282\u70b9\u5f00\u59cb\u5411\u4e0b\u641c\u7d22\uff0c\u641c\u7d22\u8d70\u8fc7\u7684\u8def\u5f84\u88ab\u79f0\u4e3a\uff08Reference Chain)\uff0c\u5f53\u4e00\u4e2a\u5bf9\u8c61\u5230 GC Roots \u6ca1\u6709\u4efb\u4f55\u5f15\u7528\u94fe\u76f8\u8fde\u65f6\uff08\u5373\u4ece GC Roots \u8282\u70b9\u5230\u8be5\u8282\u70b9\u4e0d\u53ef\u8fbe\uff09\uff0c\u5219\u8bc1\u660e\u8be5\u5bf9\u8c61\u662f\u4e0d\u53ef\u7528\u7684\u3002<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/gitee.com\/xmtblog\/img\/raw\/master\/1582592792741.jpg\" alt=\"\" \/><figcaption>\u53ef\u8fbe\u6027\u5206\u6790\u7b97\u6cd5\uff08Reachability Analysis\uff09<\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u901a\u8fc7\u53ef\u8fbe\u6027\u7b97\u6cd5\uff0c\u6210\u529f\u89e3\u51b3\u4e86\u5f15\u7528\u8ba1\u6570\u6240\u65e0\u6cd5\u89e3\u51b3\u7684\u95ee\u9898-\u201c\u5faa\u73af\u4f9d\u8d56\u201d\uff0c\u53ea\u8981\u4f60\u65e0\u6cd5\u4e0e GC Root \u5efa\u7acb\u76f4\u63a5\u6216\u95f4\u63a5\u7684\u8fde\u63a5\uff0c\u7cfb\u7edf\u5c31\u4f1a\u5224\u5b9a\u4f60\u4e3a\u53ef\u56de\u6536\u5bf9\u8c61\u3002\u90a3\u8fd9\u6837\u5c31\u5f15\u7533\u51fa\u4e86\u53e6\u4e00\u4e2a\u95ee\u9898\uff0c\u54ea\u4e9b\u5c5e\u4e8e GC Root\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Java \u5185\u5b58\u533a\u57df<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728 Java \u8bed\u8a00\u4e2d\uff0c\u53ef\u4f5c\u4e3a GC Root \u7684\u5bf9\u8c61\u5305\u62ec\u4ee5\u4e0b4\u79cd\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u865a\u62df\u673a\u6808\uff08\u6808\u5e27\u4e2d\u7684\u672c\u5730\u53d8\u91cf\u8868\uff09\u4e2d\u5f15\u7528\u7684\u5bf9\u8c61<\/li><li>\u65b9\u6cd5\u533a\u4e2d\u7c7b\u9759\u6001\u5c5e\u6027\u5f15\u7528\u7684\u5bf9\u8c61<\/li><li>\u65b9\u6cd5\u533a\u4e2d\u5e38\u91cf\u5f15\u7528\u7684\u5bf9\u8c61<\/li><li>\u672c\u5730\u65b9\u6cd5\u6808\u4e2d JNI\uff08\u5373\u4e00\u822c\u8bf4\u7684 Native \u65b9\u6cd5\uff09\u5f15\u7528\u7684\u5bf9\u8c61<\/li><\/ul>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/gitee.com\/xmtblog\/img\/raw\/master\/1582592805376.jpg\" alt=\"\" \/><figcaption>Java \u5185\u5b58\u533a\u57df\uff0c\u8fd0\u884c\u65f6\u6570\u636e\u533a<\/figcaption><\/figure><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">\u865a\u62df\u673a\u6808\uff08\u6808\u5e27\u4e2d\u7684\u672c\u5730\u53d8\u91cf\u8868\uff09\u4e2d\u5f15\u7528\u7684\u5bf9\u8c61<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u6b64\u65f6\u7684 s\uff0c\u5373\u4e3a GC Root\uff0c\u5f53s\u7f6e\u7a7a\u65f6\uff0clocalParameter \u5bf9\u8c61\u4e5f\u65ad\u6389\u4e86\u4e0e GC Root \u7684\u5f15\u7528\u94fe\uff0c\u5c06\u88ab\u56de\u6536\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public class StackLocalParameter {\n    public StackLocalParameter(String name){}\n}\npublic static void testGC(){\n    StackLocalParameter s = new StackLocalParameter(\"localParameter\");\n    s = null;\n}<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u65b9\u6cd5\u533a\u4e2d\u7c7b\u9759\u6001\u5c5e\u6027\u5f15\u7528\u7684\u5bf9\u8c61<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">s \u4e3a GC Root\uff0cs \u7f6e\u4e3a null\uff0c\u7ecf\u8fc7 GC \u540e\uff0cs \u6240\u6307\u5411\u7684 properties \u5bf9\u8c61\u7531\u4e8e\u65e0\u6cd5\u4e0e GC Root \u5efa\u7acb\u5173\u7cfb\u88ab\u56de\u6536\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u800c m \u4f5c\u4e3a\u7c7b\u7684\u9759\u6001\u5c5e\u6027\uff0c\u4e5f\u5c5e\u4e8e GC Root\uff0cparameter \u5bf9\u8c61\u4f9d\u7136\u4e0e GC root \u5efa\u7acb\u7740\u8fde\u63a5\uff0c\u6240\u4ee5\u6b64\u65f6 parameter \u5bf9\u8c61\u5e76\u4e0d\u4f1a\u88ab\u56de\u6536\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public class MethodAreaStaicProperties {\n    public static MethodAreaStaicProperties m;\n    public MethodAreaStaicProperties(String name){}\n}\npublic static void testGC(){\n    MethodAreaStaicProperties s = new MethodAreaStaicProperties(\"properties\");\n    s.m = new MethodAreaStaicProperties(\"parameter\");\n    s = null;\n}<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u65b9\u6cd5\u533a\u4e2d\u5e38\u91cf\u5f15\u7528\u7684\u5bf9\u8c61<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">m \u5373\u4e3a\u65b9\u6cd5\u533a\u4e2d\u7684\u5e38\u91cf\u5f15\u7528\uff0c\u4e5f\u4e3a GC Root\uff0cs \u7f6e\u4e3a null \u540e\uff0cfinal \u5bf9\u8c61\u4e5f\u4e0d\u4f1a\u56e0\u6ca1\u6709\u4e0e GC Root \u5efa\u7acb\u8054\u7cfb\u800c\u88ab\u56de\u6536\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public class MethodAreaStaicProperties {\n    public static final MethodAreaStaicProperties m = MethodAreaStaicProperties(\"final\");\n    public MethodAreaStaicProperties(String name){}\n}\npublic static void testGC(){\n    MethodAreaStaicProperties s = new MethodAreaStaicProperties(\"staticProperties\");\n    s = null;\n}<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u672c\u5730\u65b9\u6cd5\u6808\u4e2d\u5f15\u7528\u7684\u5bf9\u8c61<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u4efb\u4f55 Native \u63a5\u53e3\u90fd\u4f1a\u4f7f\u7528\u67d0\u79cd\u672c\u5730\u65b9\u6cd5\u6808\uff0c\u5b9e\u73b0\u7684\u672c\u5730\u65b9\u6cd5\u63a5\u53e3\u662f\u4f7f\u7528 C \u8fde\u63a5\u6a21\u578b\u7684\u8bdd\uff0c\u90a3\u4e48\u5b83\u7684\u672c\u5730\u65b9\u6cd5\u6808\u5c31\u662f C \u6808\u3002\u5f53\u7ebf\u7a0b\u8c03\u7528 Java \u65b9\u6cd5\u65f6\uff0c\u865a\u62df\u673a\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u6808\u5e27\u5e76\u538b\u5165 Java \u6808\u3002\u7136\u800c\u5f53\u5b83\u8c03\u7528\u7684\u662f\u672c\u5730\u65b9\u6cd5\u65f6\uff0c\u865a\u62df\u673a\u4f1a\u4fdd\u6301 Java \u6808\u4e0d\u53d8\uff0c\u4e0d\u518d\u5728\u7ebf\u7a0b\u7684 Java \u6808\u4e2d\u538b\u5165\u65b0\u7684\u5e27\uff0c\u865a\u62df\u673a\u53ea\u662f\u7b80\u5355\u5730\u52a8\u6001\u8fde\u63a5\u5e76\u76f4\u63a5\u8c03\u7528\u6307\u5b9a\u7684\u672c\u5730\u65b9\u6cd5\u3002<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/gitee.com\/xmtblog\/img\/raw\/master\/1582592817477.jpg\" alt=\"\" \/><figcaption>\u8c03\u7528 Java \u65b9\u6cd5\u548c\u672c\u5730\u65b9\u6cd5\u5bf9\u6bd4<\/figcaption><\/figure><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">\u600e\u4e48\u56de\u6536\u5783\u573e<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u786e\u5b9a\u4e86\u54ea\u4e9b\u5783\u573e\u53ef\u4ee5\u88ab\u56de\u6536\u540e\uff0c\u5783\u573e\u6536\u96c6\u5668\u8981\u505a\u7684\u4e8b\u60c5\u5c31\u662f\u5f00\u59cb\u8fdb\u884c\u5783\u573e\u56de\u6536\uff0c\u4f46\u662f\u8fd9\u91cc\u9762\u6d89\u53ca\u5230\u4e00\u4e2a\u95ee\u9898\u662f\uff1a\u5982\u4f55\u9ad8\u6548\u5730\u8fdb\u884c\u5783\u573e\u56de\u6536\u3002\u7531\u4e8eJava\u865a\u62df\u673a\u89c4\u8303\u5e76\u6ca1\u6709\u5bf9\u5982\u4f55\u5b9e\u73b0\u5783\u573e\u6536\u96c6\u5668\u505a\u51fa\u660e\u786e\u7684\u89c4\u5b9a\uff0c\u56e0\u6b64\u5404\u4e2a\u5382\u5546\u7684\u865a\u62df\u673a\u53ef\u4ee5\u91c7\u7528\u4e0d\u540c\u7684\u65b9\u5f0f\u6765\u5b9e\u73b0\u5783\u573e\u6536\u96c6\u5668\uff0c\u8fd9\u91cc\u6211\u4eec\u8ba8\u8bba\u51e0\u79cd\u5e38\u89c1\u7684\u5783\u573e\u6536\u96c6\u7b97\u6cd5\u7684\u6838\u5fc3\u601d\u60f3\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u6807\u8bb0 &#8212; \u6e05\u9664\u7b97\u6cd5<\/h2>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/gitee.com\/xmtblog\/img\/raw\/master\/1582592827036.jpg\" alt=\"\" \/><figcaption>GC \u6807\u8bb0\u6e05\u9664\u7b97\u6cd5<\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u6807\u8bb0\u6e05\u9664\u7b97\u6cd5\uff08Mark-Sweep\uff09\u662f\u6700\u57fa\u7840\u7684\u4e00\u79cd\u5783\u573e\u56de\u6536\u7b97\u6cd5\uff0c\u5b83\u5206\u4e3a2\u90e8\u5206\uff0c\u5148\u628a\u5185\u5b58\u533a\u57df\u4e2d\u7684\u8fd9\u4e9b\u5bf9\u8c61\u8fdb\u884c\u6807\u8bb0\uff0c\u54ea\u4e9b\u5c5e\u4e8e\u53ef\u56de\u6536\u6807\u8bb0\u51fa\u6765\uff0c\u7136\u540e\u628a\u8fd9\u4e9b\u5783\u573e\u62ce\u51fa\u6765\u6e05\u7406\u6389\u3002\u5c31\u50cf\u4e0a\u56fe\u4e00\u6837\uff0c\u6e05\u7406\u6389\u7684\u5783\u573e\u5c31\u53d8\u6210\u672a\u4f7f\u7528\u7684\u5185\u5b58\u533a\u57df\uff0c\u7b49\u5f85\u88ab\u518d\u6b21\u4f7f\u7528\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u903b\u8f91\u518d\u6e05\u6670\u4e0d\u8fc7\u4e86\uff0c\u5e76\u4e14\u4e5f\u5f88\u597d\u64cd\u4f5c\uff0c\u4f46\u5b83\u5b58\u5728\u4e00\u4e2a\u5f88\u5927\u7684\u95ee\u9898\uff0c\u90a3\u5c31\u662f\u5185\u5b58\u788e\u7247\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0a\u56fe\u4e2d\u7b49\u65b9\u5757\u7684\u5047\u8bbe\u662f 2M\uff0c\u5c0f\u4e00\u4e9b\u7684\u662f 1M\uff0c\u5927\u4e00\u4e9b\u7684\u662f 4M\u3002\u7b49\u6211\u4eec\u56de\u6536\u5b8c\uff0c\u5185\u5b58\u5c31\u4f1a\u5207\u6210\u4e86\u5f88\u591a\u6bb5\u3002\u6211\u4eec\u77e5\u9053\u5f00\u8f9f\u5185\u5b58\u7a7a\u95f4\u65f6\uff0c\u9700\u8981\u7684\u662f\u8fde\u7eed\u7684\u5185\u5b58\u533a\u57df\uff0c\u8fd9\u65f6\u5019\u6211\u4eec\u9700\u8981\u4e00\u4e2a 2M\u7684\u5185\u5b58\u533a\u57df\uff0c\u5176\u4e2d\u67092\u4e2a 1M \u662f\u6ca1\u6cd5\u7528\u7684\u3002\u8fd9\u6837\u5c31\u5bfc\u81f4\uff0c\u5176\u5b9e\u6211\u4eec\u672c\u8eab\u8fd8\u6709\u8fd9\u4e48\u591a\u7684\u5185\u5b58\u7684\uff0c\u4f46\u5374\u7528\u4e0d\u4e86\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u590d\u5236\u7b97\u6cd5<\/h2>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/gitee.com\/xmtblog\/img\/raw\/master\/1582592840675.jpg\" alt=\"\" \/><figcaption>GC \u590d\u5236\u7b97\u6cd5<\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u590d\u5236\u7b97\u6cd5\uff08Copying\uff09\u662f\u5728\u6807\u8bb0\u6e05\u9664\u7b97\u6cd5\u4e0a\u6f14\u5316\u800c\u6765\uff0c\u89e3\u51b3\u6807\u8bb0\u6e05\u9664\u7b97\u6cd5\u7684\u5185\u5b58\u788e\u7247\u95ee\u9898\u3002\u5b83\u5c06\u53ef\u7528\u5185\u5b58\u6309\u5bb9\u91cf\u5212\u5206\u4e3a\u5927\u5c0f\u76f8\u7b49\u7684\u4e24\u5757\uff0c\u6bcf\u6b21\u53ea\u4f7f\u7528\u5176\u4e2d\u7684\u4e00\u5757\u3002\u5f53\u8fd9\u4e00\u5757\u7684\u5185\u5b58\u7528\u5b8c\u4e86\uff0c\u5c31\u5c06\u8fd8\u5b58\u6d3b\u7740\u7684\u5bf9\u8c61\u590d\u5236\u5230\u53e6\u5916\u4e00\u5757\u4e0a\u9762\uff0c\u7136\u540e\u518d\u628a\u5df2\u4f7f\u7528\u8fc7\u7684\u5185\u5b58\u7a7a\u95f4\u4e00\u6b21\u6e05\u7406\u6389\u3002\u4fdd\u8bc1\u4e86\u5185\u5b58\u7684\u8fde\u7eed\u53ef\u7528\uff0c\u5185\u5b58\u5206\u914d\u65f6\u4e5f\u5c31\u4e0d\u7528\u8003\u8651\u5185\u5b58\u788e\u7247\u7b49\u590d\u6742\u60c5\u51b5\uff0c\u903b\u8f91\u6e05\u6670\uff0c\u8fd0\u884c\u9ad8\u6548\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0a\u9762\u7684\u56fe\u5f88\u6e05\u695a\uff0c\u4e5f\u5f88\u660e\u663e\u7684\u66b4\u9732\u4e86\u53e6\u4e00\u4e2a\u95ee\u9898\uff0c\u5408\u7740\u6211\u8fd9140\u5e73\u7684\u5927\u4e09\u623f\uff0c\u53ea\u80fd\u5f5370\u5e73\u7c73\u7684\u5c0f\u4e24\u623f\u6765\u4f7f\uff1f\u4ee3\u4ef7\u5b9e\u5728\u592a\u9ad8\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u6807\u8bb0\u6574\u7406\u7b97\u6cd5<\/h2>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/gitee.com\/xmtblog\/img\/raw\/master\/1582592851458.jpg\" alt=\"\" \/><figcaption>GC \u6807\u8bb0\u6574\u7406\u7b97\u6cd5<\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u6807\u8bb0\u6574\u7406\u7b97\u6cd5\uff08Mark-Compact\uff09\u6807\u8bb0\u8fc7\u7a0b\u4ecd\u7136\u4e0e\u6807\u8bb0 &#8212; \u6e05\u9664\u7b97\u6cd5\u4e00\u6837\uff0c\u4f46\u540e\u7eed\u6b65\u9aa4\u4e0d\u662f\u76f4\u63a5\u5bf9\u53ef\u56de\u6536\u5bf9\u8c61\u8fdb\u884c\u6e05\u7406\uff0c\u800c\u662f\u8ba9\u6240\u6709\u5b58\u6d3b\u7684\u5bf9\u8c61\u90fd\u5411\u4e00\u7aef\u79fb\u52a8\uff0c\u518d\u6e05\u7406\u6389\u7aef\u8fb9\u754c\u4ee5\u5916\u7684\u5185\u5b58\u533a\u57df\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6807\u8bb0\u6574\u7406\u7b97\u6cd5\u4e00\u65b9\u9762\u5728\u6807\u8bb0-\u6e05\u9664\u7b97\u6cd5\u4e0a\u505a\u4e86\u5347\u7ea7\uff0c\u89e3\u51b3\u4e86\u5185\u5b58\u788e\u7247\u7684\u95ee\u9898\uff0c\u4e5f\u89c4\u907f\u4e86\u590d\u5236\u7b97\u6cd5\u53ea\u80fd\u5229\u7528\u4e00\u534a\u5185\u5b58\u533a\u57df\u7684\u5f0a\u7aef\u3002\u770b\u8d77\u6765\u5f88\u7f8e\u597d\uff0c\u4f46\u4ece\u4e0a\u56fe\u53ef\u4ee5\u770b\u5230\uff0c\u5b83\u5bf9\u5185\u5b58\u53d8\u52a8\u66f4\u9891\u7e41\uff0c\u9700\u8981\u6574\u7406\u6240\u6709\u5b58\u6d3b\u5bf9\u8c61\u7684\u5f15\u7528\u5730\u5740\uff0c\u5728\u6548\u7387\u4e0a\u6bd4\u590d\u5236\u7b97\u6cd5\u8981\u5dee\u5f88\u591a\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5206\u4ee3\u6536\u96c6\u7b97\u6cd5\u5206\u4ee3\u6536\u96c6\u7b97\u6cd5\uff08Generational Collection\uff09\u4e25\u683c\u6765\u8bf4\u5e76\u4e0d\u662f\u4e00\u79cd\u601d\u60f3\u6216\u7406\u8bba\uff0c\u800c\u662f\u878d\u5408\u4e0a\u8ff03\u79cd\u57fa\u7840\u7684\u7b97\u6cd5\u601d\u60f3\uff0c\u800c\u4ea7\u751f\u7684\u9488\u5bf9\u4e0d\u540c\u60c5\u51b5\u6240\u91c7\u7528\u4e0d\u540c\u7b97\u6cd5\u7684\u4e00\u5957\u7ec4\u5408\u62f3\u3002\u5bf9\u8c61\u5b58\u6d3b\u5468\u671f\u7684\u4e0d\u540c\u5c06\u5185\u5b58\u5212\u5206\u4e3a\u51e0\u5757\u3002\u4e00\u822c\u662f\u628a Java \u5806\u5206\u4e3a\u65b0\u751f\u4ee3\u548c\u8001\u5e74\u4ee3\uff0c\u8fd9\u6837\u5c31\u53ef\u4ee5\u6839\u636e\u5404\u4e2a\u5e74\u4ee3\u7684\u7279\u70b9\u91c7\u7528\u6700\u9002\u5f53\u7684\u6536\u96c6\u7b97\u6cd5\u3002\u5728\u65b0\u751f\u4ee3\u4e2d\uff0c\u6bcf\u6b21\u5783\u573e\u6536\u96c6\u65f6\u90fd\u53d1\u73b0\u6709\u5927\u6279\u5bf9\u8c61\u6b7b\u53bb\uff0c\u53ea\u6709\u5c11\u91cf\u5b58\u6d3b\uff0c\u90a3\u5c31\u9009\u7528\u590d\u5236\u7b97\u6cd5\uff0c\u53ea\u9700\u8981\u4ed8\u51fa\u5c11\u91cf\u5b58\u6d3b\u5bf9\u8c61\u7684\u590d\u5236\u6210\u672c\u5c31\u53ef\u4ee5\u5b8c\u6210\u6536\u96c6\u3002\u800c\u8001\u5e74\u4ee3\u4e2d\u56e0\u4e3a\u5bf9\u8c61\u5b58\u6d3b\u7387\u9ad8\u3001\u6ca1\u6709\u989d\u5916\u7a7a\u95f4\u5bf9\u5b83\u8fdb\u884c\u5206\u914d\u62c5\u4fdd\uff0c\u5c31\u5fc5\u987b\u4f7f\u7528\u6807\u8bb0-\u6e05\u7406\u6216\u8005\u6807\u8bb0 &#8212; \u6574\u7406\u7b97\u6cd5\u6765\u8fdb\u884c\u56de\u6536\u3002so\uff0c\u53e6\u4e00\u4e2a\u95ee\u9898\u6765\u4e86\uff0c\u90a3\u5185\u5b58\u533a\u57df\u5230\u5e95\u88ab\u5206\u4e3a\u54ea\u51e0\u5757\uff0c\u6bcf\u4e00\u5757\u53c8\u6709\u4ec0\u4e48\u7279\u522b\u9002\u5408\u4ec0\u4e48\u7b97\u6cd5\u5462\uff1f<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u5185\u5b58\u6a21\u578b\u4e0e\u56de\u6536\u7b56\u7565<\/h2>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/gitee.com\/xmtblog\/img\/raw\/master\/1582592860953.jpg\" alt=\"\" \/><figcaption>Java \u5185\u5b58\u6a21\u578b\u4e0e\u56de\u6536\u7b56\u7565<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Java \u5806\uff08Java Heap\uff09\u662fJVM\u6240\u7ba1\u7406\u7684\u5185\u5b58\u4e2d\u6700\u5927\u7684\u4e00\u5757\uff0c\u5806\u53c8\u662f\u5783\u573e\u6536\u96c6\u5668\u7ba1\u7406\u7684\u4e3b\u8981\u533a\u57df\uff0c\u8fd9\u91cc\u6211\u4eec\u4e3b\u8981\u5206\u6790\u4e00\u4e0b Java \u5806\u7684\u7ed3\u6784\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Java \u5806\u4e3b\u8981\u5206\u4e3a2\u4e2a\u533a\u57df-\u5e74\u8f7b\u4ee3\u4e0e\u8001\u5e74\u4ee3\uff0c\u5176\u4e2d\u5e74\u8f7b\u4ee3\u53c8\u5206 Eden \u533a\u548c Survivor \u533a\uff0c\u5176\u4e2d Survivor \u533a\u53c8\u5206 From \u548c To 2\u4e2a\u533a\u3002\u53ef\u80fd\u8fd9\u65f6\u5019\u5927\u5bb6\u4f1a\u6709\u7591\u95ee\uff0c\u4e3a\u4ec0\u4e48\u9700\u8981 Survivor \u533a\uff0c\u4e3a\u4ec0\u4e48Survivor \u8fd8\u8981\u52062\u4e2a\u533a\u3002\u4e0d\u7740\u6025\uff0c\u6211\u4eec\u4ece\u5934\u5230\u5c3e\uff0c\u770b\u770b\u5bf9\u8c61\u5230\u5e95\u662f\u600e\u4e48\u6765\u7684\uff0c\u800c\u5b83\u53c8\u662f\u600e\u4e48\u6ca1\u7684\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Eden \u533a<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">IBM \u516c\u53f8\u7684\u4e13\u4e1a\u7814\u7a76\u8868\u660e\uff0c\u6709\u5c06\u8fd198%\u7684\u5bf9\u8c61\u662f\u671d\u751f\u5915\u6b7b\uff0c\u6240\u4ee5\u9488\u5bf9\u8fd9\u4e00\u73b0\u72b6\uff0c\u5927\u591a\u6570\u60c5\u51b5\u4e0b\uff0c\u5bf9\u8c61\u4f1a\u5728\u65b0\u751f\u4ee3 Eden \u533a\u4e2d\u8fdb\u884c\u5206\u914d\uff0c\u5f53 Eden \u533a\u6ca1\u6709\u8db3\u591f\u7a7a\u95f4\u8fdb\u884c\u5206\u914d\u65f6\uff0c\u865a\u62df\u673a\u4f1a\u53d1\u8d77\u4e00\u6b21 Minor GC\uff0cMinor GC \u76f8\u6bd4 Major GC \u66f4\u9891\u7e41\uff0c\u56de\u6536\u901f\u5ea6\u4e5f\u66f4\u5feb\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u901a\u8fc7 Minor GC \u4e4b\u540e\uff0cEden \u4f1a\u88ab\u6e05\u7a7a\uff0cEden \u533a\u4e2d\u7edd\u5927\u90e8\u5206\u5bf9\u8c61\u4f1a\u88ab\u56de\u6536\uff0c\u800c\u90a3\u4e9b\u65e0\u9700\u56de\u6536\u7684\u5b58\u6d3b\u5bf9\u8c61\uff0c\u5c06\u4f1a\u8fdb\u5230 Survivor \u7684 From \u533a\uff08\u82e5 From \u533a\u4e0d\u591f\uff0c\u5219\u76f4\u63a5\u8fdb\u5165 Old \u533a\uff09\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Survivor \u533a<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Survivor \u533a\u76f8\u5f53\u4e8e\u662f Eden \u533a\u548c Old \u533a\u7684\u4e00\u4e2a\u7f13\u51b2\uff0c\u7c7b\u4f3c\u4e8e\u6211\u4eec\u4ea4\u901a\u706f\u4e2d\u7684\u9ec4\u706f\u3002Survivor \u53c8\u5206\u4e3a2\u4e2a\u533a\uff0c\u4e00\u4e2a\u662f From \u533a\uff0c\u4e00\u4e2a\u662f To \u533a\u3002\u6bcf\u6b21\u6267\u884c Minor GC\uff0c\u4f1a\u5c06 Eden \u533a\u548c From \u5b58\u6d3b\u7684\u5bf9\u8c61\u653e\u5230 Survivor \u7684 To \u533a\uff08\u5982\u679c To \u533a\u4e0d\u591f\uff0c\u5219\u76f4\u63a5\u8fdb\u5165 Old \u533a\uff09\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e3a\u5565\u9700\u8981\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0d\u5c31\u662f\u65b0\u751f\u4ee3\u5230\u8001\u5e74\u4ee3\u4e48\uff0c\u76f4\u63a5 Eden \u5230 Old \u4e0d\u597d\u4e86\u5417\uff0c\u4e3a\u5565\u8981\u8fd9\u4e48\u590d\u6742\u3002\u60f3\u60f3\u5982\u679c\u6ca1\u6709 Survivor \u533a\uff0cEden \u533a\u6bcf\u8fdb\u884c\u4e00\u6b21 Minor GC\uff0c\u5b58\u6d3b\u7684\u5bf9\u8c61\u5c31\u4f1a\u88ab\u9001\u5230\u8001\u5e74\u4ee3\uff0c\u8001\u5e74\u4ee3\u5f88\u5feb\u5c31\u4f1a\u88ab\u586b\u6ee1\u3002\u800c\u6709\u5f88\u591a\u5bf9\u8c61\u867d\u7136\u4e00\u6b21 Minor GC \u6ca1\u6709\u6d88\u706d\uff0c\u4f46\u5176\u5b9e\u4e5f\u5e76\u4e0d\u4f1a\u8e66\u8df6\u591a\u4e45\uff0c\u6216\u8bb8\u7b2c\u4e8c\u6b21\uff0c\u7b2c\u4e09\u6b21\u5c31\u9700\u8981\u88ab\u6e05\u9664\u3002\u8fd9\u65f6\u5019\u79fb\u5165\u8001\u5e74\u533a\uff0c\u5f88\u660e\u663e\u4e0d\u662f\u4e00\u4e2a\u660e\u667a\u7684\u51b3\u5b9a\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6240\u4ee5\uff0cSurvivor \u7684\u5b58\u5728\u610f\u4e49\u5c31\u662f\u51cf\u5c11\u88ab\u9001\u5230\u8001\u5e74\u4ee3\u7684\u5bf9\u8c61\uff0c\u8fdb\u800c\u51cf\u5c11 Major GC \u7684\u53d1\u751f\u3002Survivor \u7684\u9884\u7b5b\u9009\u4fdd\u8bc1\uff0c\u53ea\u6709\u7ecf\u538616\u6b21 Minor GC \u8fd8\u80fd\u5728\u65b0\u751f\u4ee3\u4e2d\u5b58\u6d3b\u7684\u5bf9\u8c61\uff0c\u624d\u4f1a\u88ab\u9001\u5230\u8001\u5e74\u4ee3\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e3a\u5565\u9700\u8981\u4fe9\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u8bbe\u7f6e\u4e24\u4e2a Survivor \u533a\u6700\u5927\u7684\u597d\u5904\u5c31\u662f\u89e3\u51b3\u5185\u5b58\u788e\u7247\u5316\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6211\u4eec\u5148\u5047\u8bbe\u4e00\u4e0b\uff0cSurvivor \u5982\u679c\u53ea\u6709\u4e00\u4e2a\u533a\u57df\u4f1a\u600e\u6837\u3002Minor GC \u6267\u884c\u540e\uff0cEden \u533a\u88ab\u6e05\u7a7a\u4e86\uff0c\u5b58\u6d3b\u7684\u5bf9\u8c61\u653e\u5230\u4e86 Survivor \u533a\uff0c\u800c\u4e4b\u524d Survivor \u533a\u4e2d\u7684\u5bf9\u8c61\uff0c\u53ef\u80fd\u4e5f\u6709\u4e00\u4e9b\u662f\u9700\u8981\u88ab\u6e05\u9664\u7684\u3002\u95ee\u9898\u6765\u4e86\uff0c\u8fd9\u65f6\u5019\u6211\u4eec\u600e\u4e48\u6e05\u9664\u5b83\u4eec\uff1f\u5728\u8fd9\u79cd\u573a\u666f\u4e0b\uff0c\u6211\u4eec\u53ea\u80fd\u6807\u8bb0\u6e05\u9664\uff0c\u800c\u6211\u4eec\u77e5\u9053\u6807\u8bb0\u6e05\u9664\u6700\u5927\u7684\u95ee\u9898\u5c31\u662f\u5185\u5b58\u788e\u7247\uff0c\u5728\u65b0\u751f\u4ee3\u8fd9\u79cd\u7ecf\u5e38\u4f1a\u6d88\u4ea1\u7684\u533a\u57df\uff0c\u91c7\u7528\u6807\u8bb0\u6e05\u9664\u5fc5\u7136\u4f1a\u8ba9\u5185\u5b58\u4ea7\u751f\u4e25\u91cd\u7684\u788e\u7247\u5316\u3002\u56e0\u4e3a Survivor \u67092\u4e2a\u533a\u57df\uff0c\u6240\u4ee5\u6bcf\u6b21 Minor GC\uff0c\u4f1a\u5c06\u4e4b\u524d Eden \u533a\u548c From \u533a\u4e2d\u7684\u5b58\u6d3b\u5bf9\u8c61\u590d\u5236\u5230 To \u533a\u57df\u3002\u7b2c\u4e8c\u6b21 Minor GC \u65f6\uff0cFrom \u4e0e To \u804c\u8d23\u5151\u6362\uff0c\u8fd9\u65f6\u5019\u4f1a\u5c06 Eden \u533a\u548c To \u533a\u4e2d\u7684\u5b58\u6d3b\u5bf9\u8c61\u518d\u590d\u5236\u5230 From \u533a\u57df\uff0c\u4ee5\u6b64\u53cd\u590d\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u79cd\u673a\u5236\u6700\u5927\u7684\u597d\u5904\u5c31\u662f\uff0c\u6574\u4e2a\u8fc7\u7a0b\u4e2d\uff0c\u6c38\u8fdc\u6709\u4e00\u4e2a Survivor space \u662f\u7a7a\u7684\uff0c\u53e6\u4e00\u4e2a\u975e\u7a7a\u7684 Survivor space \u662f\u65e0\u788e\u7247\u7684\u3002\u90a3\u4e48\uff0cSurvivor \u4e3a\u4ec0\u4e48\u4e0d\u5206\u66f4\u591a\u5757\u5462\uff1f\u6bd4\u65b9\u8bf4\u5206\u6210\u4e09\u4e2a\u3001\u56db\u4e2a\u3001\u4e94\u4e2a?\u663e\u7136\uff0c\u5982\u679c Survivor \u533a\u518d\u7ec6\u5206\u4e0b\u53bb\uff0c\u6bcf\u4e00\u5757\u7684\u7a7a\u95f4\u5c31\u4f1a\u6bd4\u8f83\u5c0f\uff0c\u5bb9\u6613\u5bfc\u81f4 Survivor \u533a\u6ee1\uff0c\u4e24\u5757 Survivor \u533a\u53ef\u80fd\u662f\u7ecf\u8fc7\u6743\u8861\u4e4b\u540e\u7684\u6700\u4f73\u65b9\u6848\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Old \u533a<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u8001\u5e74\u4ee3\u5360\u636e\u77402\/3\u7684\u5806\u5185\u5b58\u7a7a\u95f4\uff0c\u53ea\u6709\u5728 Major GC \u7684\u65f6\u5019\u624d\u4f1a\u8fdb\u884c\u6e05\u7406\uff0c\u6bcf\u6b21 GC \u90fd\u4f1a\u89e6\u53d1\u201cStop-The-World\u201d\u3002\u5185\u5b58\u8d8a\u5927\uff0cSTW \u7684\u65f6\u95f4\u4e5f\u8d8a\u957f\uff0c\u6240\u4ee5\u5185\u5b58\u4e5f\u4e0d\u4ec5\u4ec5\u662f\u8d8a\u5927\u5c31\u8d8a\u597d\u3002\u7531\u4e8e\u590d\u5236\u7b97\u6cd5\u5728\u5bf9\u8c61\u5b58\u6d3b\u7387\u8f83\u9ad8\u7684\u8001\u5e74\u4ee3\u4f1a\u8fdb\u884c\u5f88\u591a\u6b21\u7684\u590d\u5236\u64cd\u4f5c\uff0c\u6548\u7387\u5f88\u4f4e\uff0c\u6240\u4ee5\u8001\u5e74\u4ee3\u8fd9\u91cc\u91c7\u7528\u7684\u662f\u6807\u8bb0 &#8212; \u6574\u7406\u7b97\u6cd5\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u9664\u4e86\u4e0a\u8ff0\u6240\u8bf4\uff0c\u5728\u5185\u5b58\u62c5\u4fdd\u673a\u5236\u4e0b\uff0c\u65e0\u6cd5\u5b89\u7f6e\u7684\u5bf9\u8c61\u4f1a\u76f4\u63a5\u8fdb\u5230\u8001\u5e74\u4ee3\uff0c\u4ee5\u4e0b\u51e0\u79cd\u60c5\u51b5\u4e5f\u4f1a\u8fdb\u5165\u8001\u5e74\u4ee3\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u5927\u5bf9\u8c61<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5927\u5bf9\u8c61\u6307\u9700\u8981\u5927\u91cf\u8fde\u7eed\u5185\u5b58\u7a7a\u95f4\u7684\u5bf9\u8c61\uff0c\u8fd9\u90e8\u5206\u5bf9\u8c61\u4e0d\u7ba1\u662f\u4e0d\u662f\u201c\u671d\u751f\u5915\u6b7b\u201d\uff0c\u90fd\u4f1a\u76f4\u63a5\u8fdb\u5230\u8001\u5e74\u4ee3\u3002\u8fd9\u6837\u505a\u4e3b\u8981\u662f\u4e3a\u4e86\u907f\u514d\u5728 Eden \u533a\u53ca2\u4e2a Survivor \u533a\u4e4b\u95f4\u53d1\u751f\u5927\u91cf\u7684\u5185\u5b58\u590d\u5236\u3002\u5f53\u4f60\u7684\u7cfb\u7edf\u6709\u975e\u5e38\u591a\u201c\u671d\u751f\u5915\u6b7b\u201d\u7684\u5927\u5bf9\u8c61\u65f6\uff0c\u5f97\u6ce8\u610f\u4e86\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u957f\u671f\u5b58\u6d3b\u5bf9\u8c61<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u865a\u62df\u673a\u7ed9\u6bcf\u4e2a\u5bf9\u8c61\u5b9a\u4e49\u4e86\u4e00\u4e2a\u5bf9\u8c61\u5e74\u9f84\uff08Age\uff09\u8ba1\u6570\u5668\u3002\u6b63\u5e38\u60c5\u51b5\u4e0b\u5bf9\u8c61\u4f1a\u4e0d\u65ad\u7684\u5728 Survivor \u7684 From \u533a\u4e0e To \u533a\u4e4b\u95f4\u79fb\u52a8\uff0c\u5bf9\u8c61\u5728 Survivor \u533a\u4e2d\u6bcf\u7ecf\u5386\u4e00\u6b21 Minor GC\uff0c\u5e74\u9f84\u5c31\u589e\u52a01\u5c81\u3002\u5f53\u5e74\u9f84\u589e\u52a0\u523015\u5c81\u65f6\uff0c\u8fd9\u65f6\u5019\u5c31\u4f1a\u88ab\u8f6c\u79fb\u5230\u8001\u5e74\u4ee3\u3002\u5f53\u7136\uff0c\u8fd9\u91cc\u768415\uff0cJVM \u4e5f\u652f\u6301\u8fdb\u884c\u7279\u6b8a\u8bbe\u7f6e\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u52a8\u6001\u5bf9\u8c61\u5e74\u9f84<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u865a\u62df\u673a\u5e76\u4e0d\u91cd\u89c6\u8981\u6c42\u5bf9\u8c61\u5e74\u9f84\u5fc5\u987b\u523015\u5c81\uff0c\u624d\u4f1a\u653e\u5165\u8001\u5e74\u533a\uff0c\u5982\u679c Survivor \u7a7a\u95f4\u4e2d\u76f8\u540c\u5e74\u9f84\u6240\u6709\u5bf9\u8c61\u5927\u5c0f\u7684\u603b\u5408\u5927\u4e8e Survivor \u7a7a\u95f4\u7684\u4e00\u534a\uff0c\u5e74\u9f84\u5927\u4e8e\u7b49\u4e8e\u8be5\u5e74\u9f84\u7684\u5bf9\u8c61\u5c31\u53ef\u4ee5\u76f4\u63a5\u8fdb\u53bb\u8001\u5e74\u533a\uff0c\u65e0\u9700\u7b49\u4f60\u201c\u6210\u5e74\u201d\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u5176\u5b9e\u6709\u70b9\u7c7b\u4f3c\u4e8e\u8d1f\u8f7d\u5747\u8861\uff0c\u8f6e\u8be2\u662f\u8d1f\u8f7d\u5747\u8861\u7684\u4e00\u79cd\uff0c\u4fdd\u8bc1\u6bcf\u53f0\u673a\u5668\u90fd\u5206\u5f97\u540c\u6837\u7684\u8bf7\u6c42\u3002\u770b\u4f3c\u5f88\u5747\u8861\uff0c\u4f46\u6bcf\u53f0\u673a\u7684\u786c\u4ef6\u4e0d\u901a\uff0c\u5065\u5eb7\u72b6\u51b5\u4e0d\u540c\uff0c\u6211\u4eec\u8fd8\u53ef\u4ee5\u57fa\u4e8e\u6bcf\u53f0\u673a\u63a5\u53d7\u7684\u8bf7\u6c42\u6570\uff0c\u6216\u6bcf\u53f0\u673a\u7684\u54cd\u5e94\u65f6\u95f4\u7b49\uff0c\u6765\u8c03\u6574\u6211\u4eec\u7684\u8d1f\u8f7d\u5747\u8861\u7b97\u6cd5\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u672c\u6587\u90e8\u5206\u5185\u5bb9\u53c2\u8003\u81ea\u4e66\u7c4d\uff1a\u300a\u6df1\u5165\u7406\u89e3Java\u865a\u62df\u673a\u300b\u3002<\/p>\n<!-- <audio autoplay=\"autoplay\" height=\"100\" width=\"100\" hidden=\"true\"><source src=\"https:\/\/c.coka.la\/orAvPR.mp3\" type=\"audio\/mp3\"\/><\/audio><img decoding=\"async\" src=\"https:\/\/images.weserv.nl\/?url=https:\/\/ws3.sinaimg.cn\/large\/8fa5dcfcgy1g4em3rzar5j20ib089ae0.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/> --><p><!-- <img decoding=\"async\" src=\"https:\/\/raw.githubusercontent.com\/xmt1139057136\/xttblog\/master\/8fa5dcfcgy1g4em3rzar5j20ib089ae0.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/>--><img decoding=\"async\" src=\"https:\/\/saas.51autoparts.cn\/api\/admin\/sys-file\/oss\/file?fileName=84db51f8561e448f9a4fda2eff0811f9.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/><\/p><p>\u6700\u540e\uff0c\u6b22\u8fce\u5173\u6ce8\u6211\u7684\u4e2a\u4eba\u5fae\u4fe1\u516c\u4f17\u53f7\uff1a\u4e1a\u4f59\u8349\uff08yyucao\uff09\uff01<b>\u53ef\u52a0\u4f5c\u8005\u5fae\u4fe1\u53f7\uff1a<font color=\"red\">xttblog2<\/font>\u3002\u5907\u6ce8\uff1a\u201c1\u201d\uff0c\u6dfb\u52a0\u535a\u4e3b\u5fae\u4fe1\u62c9\u4f60\u8fdb\u5fae\u4fe1\u7fa4\u3002\u5907\u6ce8\u9519\u8bef\u4e0d\u4f1a\u540c\u610f\u597d\u53cb\u7533\u8bf7\u3002<\/b>\u518d\u6b21\u611f\u8c22\u60a8\u7684\u5173\u6ce8\uff01\u540e\u7eed\u6709\u7cbe\u5f69\u5185\u5bb9\u4f1a\u7b2c\u4e00\u65f6\u95f4\u53d1\u7ed9\u60a8\uff01\u539f\u521b\u6587\u7ae0\u6295\u7a3f\u8bf7\u53d1\u9001\u81f3532009913@qq.com\u90ae\u7bb1\u3002\u5546\u52a1\u5408\u4f5c\u4e5f\u53ef\u6dfb\u52a0\u4f5c\u8005\u5fae\u4fe1\u8fdb\u884c\u8054\u7cfb\uff01<\/p><p>\u672c\u6587\u539f\u6587\u51fa\u5904\uff1a<a href=\"https:\/\/www.xttblog.com\">\u4e1a\u4f59\u8349<\/a>\uff1a &raquo; <a href=\"https:\/\/www.xttblog.com\/?p=4818\">\u54b1\u4eec\u4ece\u5934\u5230\u5c3e\u8bf4\u4e00\u6b21 Java \u5783\u573e\u56de\u6536<\/a><\/p><!-- <div class=\"bd-reward-stl\"><button id=\"bdRewardBtn\"><span><\/span><\/button><\/div> -->","protected":false},"excerpt":{"rendered":"<p>\u4e4b\u524d\u4e0a\u5b66\u7684\u65f6\u5019\u6709\u8fd9\u4e2a\u4e00\u4e2a\u6897\uff0c\u8bf4\u5728\u98df\u5802\u91cc\u5403\u996d\uff0c\u5403\u5b8c\u628a\u9910\u76d8\u7aef\u8d70\u6e05\u7406\u7684\uff0c\u662f C++ \u7a0b\u5e8f\u5458\uff0c\u5403\u5b8c\u76f4\u63a5\u5c31\u8d70\u7684\uff0c\u662f Ja [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[1174,328,1964,1963,1744],"class_list":["post-4818","post","type-post","status-publish","format-standard","hentry","category-java","tag-gc","tag-majorgc","tag-minorgc","tag-useparallelgc"],"_links":{"self":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/4818","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4818"}],"version-history":[{"count":1,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/4818\/revisions"}],"predecessor-version":[{"id":4819,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/4818\/revisions\/4819"}],"wp:attachment":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4818"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4818"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4818"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}