{"id":87859,"date":"2026-07-31T01:00:30","date_gmt":"2026-07-30T17:00:30","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/87859.html"},"modified":"2026-07-31T01:00:30","modified_gmt":"2026-07-30T17:00:30","slug":"%e3%80%90jvm%e5%8e%9f%e7%90%86%e8%af%a6%e8%a7%a3%e3%80%9124-%e5%9e%83%e5%9c%be%e5%9b%9e%e6%94%b6%e7%ae%97%e6%b3%95-%e6%a0%87%e8%ae%b0%e6%b8%85%e9%99%a4%e5%a4%8d%e5%88%b6%e6%95%b4%e7%90%86%e5%88%86","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/87859.html","title":{"rendered":"\u3010JVM\u539f\u7406\u8be6\u89e3\u301124-\u5783\u573e\u56de\u6536\u7b97\u6cd5-\u6807\u8bb0\u6e05\u9664\u590d\u5236\u6574\u7406\u5206\u4ee3"},"content":{"rendered":"

24-\u5783\u573e\u56de\u6536\u7b97\u6cd5：\u6807\u8bb0-\u6e05\u9664\u3001\u590d\u5236\u3001\u6574\u7406\u4e0e\u5206\u4ee3<\/h2>\n

\u77e5\u9053\u4e86"\u54ea\u4e9b\u5bf9\u8c61\u6d3b\u7740\u3001\u54ea\u4e9b\u8be5\u6b7b"，\u4e0b\u4e00\u6b65\u5c31\u662f"\u5982\u4f55\u9ad8\u6548\u56de\u6536\u6b7b\u5bf9\u8c61"\u3002GC \u7b97\u6cd5\u7ecf\u8fc7\u51e0\u5341\u5e74\u7684\u6f14\u5316，\u6c89\u6dc0\u51fa\u56db\u79cd\u57fa\u7840\u8303\u5f0f：Mark-Sweep（\u6807\u8bb0-\u6e05\u9664）\u3001Copying（\u590d\u5236）\u3001Mark-Compact（\u6807\u8bb0-\u6574\u7406） \u548c Generational（\u5206\u4ee3\u6536\u96c6）\u3002\u672c\u7bc7\u5c06\u9010\u4e00\u62c6\u89e3\u5b83\u4eec\u7684\u539f\u7406\u3001\u4f18\u52a3\u4e0e\u9002\u7528\u573a\u666f，\u5e76\u8ba8\u8bba HotSpot \u4e2d\u7684\u5361\u8868\u673a\u5236\u5982\u4f55\u89e3\u51b3\u8de8\u4ee3\u5f15\u7528\u95ee\u9898\u3002<\/p>\n

Mark-Sweep：\u6807\u8bb0-\u6e05\u9664<\/h3>\n

\u8fd9\u662f\u6700\u57fa\u7840\u3001\u4e5f\u6700\u76f4\u89c2\u7684 GC \u7b97\u6cd5\u3002\u8fc7\u7a0b\u5206\u4e24\u6b65：<\/p>\n

  • \u6807\u8bb0\u9636\u6bb5：\u4ece GC Roots \u51fa\u53d1，\u904d\u5386\u5bf9\u8c61\u56fe，\u6807\u8bb0\u6240\u6709\u5b58\u6d3b\u5bf9\u8c61\u3002<\/li>\n
  • \u6e05\u9664\u9636\u6bb5：\u7ebf\u6027\u626b\u63cf\u5806，\u56de\u6536\u672a\u6807\u8bb0\u7684\u5bf9\u8c61\u3002<\/li>\n

    \u6807\u8bb0\u524d: [A*] [B] [C*] [D] [E*] (* \u4e3a\u5b58\u6d3b)
    \n\u6807\u8bb0\u540e: [A*] [ ] [C*] [ ] [E*]
    \n \u788e\u7247 \u788e\u7247<\/p>\n

    \u4f18\u70b9<\/h4>\n
      \n
    • \u5b9e\u73b0\u7b80\u5355，\u4e0d\u9700\u8981\u79fb\u52a8\u5bf9\u8c61\u3002<\/li>\n
    • \u5728\u5b58\u6d3b\u5bf9\u8c61\u6bd4\u4f8b\u8f83\u4f4e\u65f6\u6548\u7387\u8f83\u9ad8（\u5c11\u6807\u8bb0\u3001\u591a\u56de\u6536）\u3002<\/li>\n<\/ul>\n

      \u7f3a\u70b9<\/h4>\n
        \n
      • \u6548\u7387\u4e0d\u7a33\u5b9a：\u6807\u8bb0\u548c\u6e05\u9664\u90fd\u968f\u5806\u589e\u5927\u800c\u7ebf\u6027\u589e\u957f\u3002<\/li>\n
      • \u5185\u5b58\u788e\u7247：\u56de\u6536\u540e\u4ea7\u751f\u5927\u91cf\u4e0d\u8fde\u7eed\u7a7a\u95f4\u3002\u540e\u7eed\u5206\u914d\u5927\u5bf9\u8c61\u65f6\u53ef\u80fd\u627e\u4e0d\u5230\u8db3\u591f\u8fde\u7eed\u7a7a\u95f4，\u89e6\u53d1\u63d0\u524d GC\u3002<\/li>\n<\/ul>\n

        Mark-Sweep \u662f\u65e9\u671f JVM \u7684\u4e3b\u6d41\u7b97\u6cd5，\u4e5f\u662f CMS（Concurrent Mark Sweep）\u6536\u96c6\u5668\u7684\u6838\u5fc3\u3002CMS \u4e4b\u6240\u4ee5\u88ab\u6dd8\u6c70，\u788e\u7247\u95ee\u9898\u662f\u91cd\u8981\u539f\u56e0\u4e4b\u4e00\u2014\u2014\u957f\u671f\u8fd0\u884c\u540e\u9700\u8981 Full GC \u6765\u6574\u7406\u7a7a\u95f4\u3002<\/p>\n

        \u6f14\u8fdb：\u6807\u8bb0-\u6e05\u9664\u7684\u5bf9\u8c61\u5934\u5f00\u9500<\/h4>\n

        HotSpot \u5728\u5bf9\u8c61\u5934（Mark Word）\u4e2d\u7528\u4e00\u4e2a bit \u6807\u8bb0\u5bf9\u8c61\u7684\u5b58\u6d3b\u72b6\u6001\u3002\u6807\u8bb0\u9636\u6bb5\u4f1a\u4fee\u6539\u5bf9\u8c61\u5934，\u8fd9\u4e2a\u5199\u5165\u64cd\u4f5c\u5728\u5e76\u53d1\u6536\u96c6\u5668\u4e2d\u9700\u8981\u5199\u5c4f\u969c\u652f\u6301，\u662f CMS\/G1 \u6027\u80fd\u5f00\u9500\u7684\u6765\u6e90\u4e4b\u4e00\u3002<\/p>\n

        Copying：\u590d\u5236\u7b97\u6cd5<\/h3>\n

        \u590d\u5236\u7b97\u6cd5\u7684\u601d\u8def\u662f"\u7528\u7a7a\u95f4\u6362\u65f6\u95f4"：\u5c06\u5185\u5b58\u5e73\u5206\u4e3a\u4e24\u5757，\u6bcf\u6b21\u53ea\u7528\u5176\u4e2d\u4e00\u5757；GC \u65f6\u628a\u5b58\u6d3b\u5bf9\u8c61\u5168\u90e8\u590d\u5236\u5230\u53e6\u4e00\u5757，\u7136\u540e\u6e05\u7a7a\u5f53\u524d\u5757\u3002<\/p>\n

        From \u533a: [A*] [B] [C*] [D] [E*]
        \n \u2193 \u590d\u5236
        \nTo \u533a: [A*] [C*] [E*] [ … ]
        \nFrom \u533a\u6e05\u7a7a，\u89d2\u8272\u4e92\u6362<\/p>\n

        \u4f18\u70b9<\/h4>\n
          \n
        • \u65e0\u788e\u7247：\u590d\u5236\u540e\u7684\u5bf9\u8c61\u7d27\u5bc6\u6392\u5217\u3002<\/li>\n
        • \u5206\u914d\u5feb：\u5206\u914d\u65f6\u53ea\u9700\u79fb\u52a8\u6307\u9488（bump pointer）\u3002<\/li>\n
        • \u5f53\u5b58\u6d3b\u5bf9\u8c61\u5f88\u5c11\u65f6，\u590d\u5236\u6548\u7387\u975e\u5e38\u9ad8\u2014\u2014\u53ea\u642c\u8fd0\u5c11\u91cf\u5b58\u6d3b\u5bf9\u8c61\u5373\u53ef\u5b8c\u6210\u56de\u6536\u3002<\/li>\n<\/ul>\n

          \u7f3a\u70b9<\/h4>\n
            \n
          • \u7a7a\u95f4\u5229\u7528\u7387\u4f4e：\u53ef\u7528\u5185\u5b58\u76f4\u63a5\u51cf\u534a，\u8fd9\u662f\u65e0\u6cd5\u63a5\u53d7\u7684\u4ee3\u4ef7\u3002<\/li>\n
          • \u5b58\u6d3b\u5bf9\u8c61\u591a\u65f6\u590d\u5236\u5f00\u9500\u5927：\u6781\u7aef\u60c5\u51b5\u4e0b\u6240\u6709\u5bf9\u8c61\u90fd\u5b58\u6d3b，\u590d\u5236\u6210\u672c\u63a5\u8fd1\u5168\u5806\u626b\u63cf\u3002<\/li>\n<\/ul>\n

            HotSpot \u7684\u89e3\u51b3\u65b9\u6848\u662fAppel \u5f0f\u56de\u6536：\u65b0\u751f\u4ee3\u5e76\u4e0d\u6309 1:1 \u5212\u5206，\u800c\u662f Eden : Survivor0 : Survivor1 = 8 : 1 : 1，\u6bcf\u6b21\u53ea\u7528 Eden + \u4e00\u4e2a Survivor，\u56de\u6536\u65f6\u628a\u5b58\u6d3b\u5bf9\u8c61\u590d\u5236\u5230\u53e6\u4e00\u4e2a Survivor\u3002\u8fd9\u6837\u6d6a\u8d39\u7684\u7a7a\u95f4\u53ea\u6709 10%\u3002<\/p>\n

            |—– Eden (80%) —–|– S0 (10%) –|– S1 (10%) –|
            \n \u2191 \u2191
            \n \u4f7f\u7528\u4e2d \u7a7a（\u5907\u4efd\u533a）<\/p>\n

            \u8fd9\u5c31\u662f\u65b0\u751f\u4ee3\u91c7\u7528\u590d\u5236\u7b97\u6cd5\u7684\u6839\u672c\u539f\u56e0\u2014\u2014\u65b0\u751f\u4ee3"\u671d\u751f\u5915\u706d"\u7684\u7279\u6027\u8ba9\u590d\u5236\u6210\u672c\u6781\u4f4e\u3002<\/p>\n

            Survivor \u533a\u7684\u4f5c\u7528<\/h4>\n

            Survivor \u4e0d\u662f"\u4e3a\u4e86\u5907\u4efd"\u800c\u5b58\u5728，\u5b83\u7684\u672c\u8d28\u662f**\u201c\u664b\u5347\u7f13\u51b2\u533a\u201d**：\u7ecf\u5386\u591a\u6b21 Minor GC \u4ecd\u5b58\u6d3b\u7684\u5bf9\u8c61\u4f1a\u88ab\u664b\u5347\u5230\u8001\u5e74\u4ee3\u3002-XX:MaxTenuringThreshold（\u9ed8\u8ba4 15）\u63a7\u5236\u664b\u5347\u5e74\u9f84\u9608\u503c\u3002<\/p>\n

            # \u8c03\u6574\u664b\u5347\u9608\u503c<\/span>
            \njava<\/span> -XX:MaxTenuringThreshold<\/span>=<\/span>10<\/span> -cp<\/span> MyApp com.example.Main<\/p>\n

            Mark-Compact：\u6807\u8bb0-\u6574\u7406<\/h3>\n

            \u6807\u8bb0-\u6574\u7406\u7b97\u6cd5\u7ed3\u5408\u4e86\u524d\u4e24\u8005\u7684\u601d\u8def：\u5148\u6807\u8bb0\u5b58\u6d3b\u5bf9\u8c61（\u540c Mark-Sweep），\u7136\u540e\u5c06\u5b58\u6d3b\u5bf9\u8c61\u5411\u4e00\u7aef\u79fb\u52a8，\u6e05\u7406\u8fb9\u754c\u4ee5\u5916\u7684\u7a7a\u95f4\u3002<\/p>\n

            \u6807\u8bb0\u524d: [A*] [B] [C*] [D] [E*]
            \n\u6574\u7406\u540e: [A*] [C*] [E*] [——- \u7a7a ——-]<\/p>\n

            \u4f18\u70b9<\/h4>\n
              \n
            • \u65e0\u788e\u7247：\u79fb\u52a8\u540e\u7a7a\u95f4\u8fde\u7eed\u3002<\/li>\n
            • \u7a7a\u95f4\u5229\u7528\u7387\u9ad8：\u4e0d\u50cf\u590d\u5236\u7b97\u6cd5\u90a3\u6837\u6d6a\u8d39\u4e00\u534a\u7a7a\u95f4\u3002<\/li>\n<\/ul>\n

              \u7f3a\u70b9<\/h4>\n
                \n
              • \u79fb\u52a8\u5bf9\u8c61\u5f00\u9500\u5927：\u79fb\u52a8\u540e\u9700\u8981\u66f4\u65b0\u6240\u6709\u6307\u5411\u8fd9\u4e9b\u5bf9\u8c61\u7684\u5f15\u7528，\u5199\u5c4f\u969c\u6216 STW \u4e0d\u53ef\u5c11\u3002<\/li>\n
              • \u6682\u505c\u65f6\u95f4\u66f4\u957f：\u76f8\u6bd4 Mark-Sweep，\u6574\u7406\u9636\u6bb5\u66f4\u8017\u65f6\u3002<\/li>\n<\/ul>\n

                \u8001\u5e74\u4ee3\u901a\u5e38\u91c7\u7528 Mark-Compact，\u56e0\u4e3a\u8001\u5e74\u4ee3\u5b58\u6d3b\u7387\u9ad8，\u590d\u5236\u7b97\u6cd5\u6210\u672c\u4e0d\u53ef\u63a5\u53d7\u3002\u4f46\u4e5f\u8981\u6ce8\u610f：\u79fb\u52a8\u5bf9\u8c61\u4f1a\u5bfc\u81f4\u66f4\u957f\u7684 STW，\u6240\u4ee5\u6709\u4e9b\u6536\u96c6\u5668（\u5982 CMS）\u9009\u62e9\u4e0d\u6574\u7406，\u7528 Mark-Sweep \u6362\u53d6\u66f4\u4f4e\u7684\u505c\u987f\u3002<\/p>\n

                Generational：\u5206\u4ee3\u6536\u96c6<\/h3>\n

                \u5206\u4ee3\u6536\u96c6\u4e0d\u662f\u4e00\u79cd\u72ec\u7acb\u7684\u7b97\u6cd5，\u800c\u662f\u4e00\u79cd\u7406\u8bba\u6846\u67b6\u2014\u2014\u5b83\u57fa\u4e8e\u5f31\u4ee3\u5047\u8bf4（Weak Generational Hypothesis）：<\/p>\n

              • \u7edd\u5927\u591a\u6570\u5bf9\u8c61\u671d\u751f\u5915\u706d\u3002<\/li>\n
              • \u71ac\u8fc7\u8d8a\u591a\u6b21 GC \u7684\u5bf9\u8c61\u8d8a\u96be\u4ee5\u6d88\u4ea1\u3002<\/li>\n

                \u57fa\u4e8e\u8fd9\u4e24\u70b9\u89c2\u5bdf，HotSpot \u628a\u5806\u5206\u4e3a\u65b0\u751f\u4ee3（Young Generation）\u548c\u8001\u5e74\u4ee3（Old Generation），\u9488\u5bf9\u4e0d\u540c\u4ee3\u91c7\u7528\u4e0d\u540c\u7b97\u6cd5：<\/p>\n

                  \n
                • \u65b0\u751f\u4ee3：\u5b58\u6d3b\u7387\u4f4e，\u7528 Copying（Minor GC）\u3002<\/li>\n
                • \u8001\u5e74\u4ee3：\u5b58\u6d3b\u7387\u9ad8，\u7528 Mark-Sweep \u6216 Mark-Compact（Major GC \/ Full GC）\u3002<\/li>\n<\/ul>\n

                  |———— \u65b0\u751f\u4ee3 (1\/3) ————|——– \u8001\u5e74\u4ee3 (2\/3) ——–|
                  \n| Eden | S0 | S1 | | |
                  \n| \u590d\u5236\u7b97\u6cd5 Mark-Compact \/ Mark-Sweep<\/p>\n

                  Minor GC \u4e0e Full GC<\/h4>\n
                    \n
                  • Minor GC \/ Young GC：\u53ea\u56de\u6536\u65b0\u751f\u4ee3，\u9891\u7387\u9ad8\u3001\u505c\u987f\u77ed\u3002<\/li>\n
                  • Major GC：\u56de\u6536\u8001\u5e74\u4ee3，\u5e38\u4e0e Minor GC \u8054\u52a8\u3002<\/li>\n
                  • Full GC：\u56de\u6536\u6574\u4e2a\u5806\u53ca\u5143\u7a7a\u95f4，\u505c\u987f\u6700\u957f，\u5e94\u5c3d\u91cf\u907f\u514d\u3002<\/li>\n<\/ul>\n

                    \u5de5\u7a0b\u4e0a GC \u8c03\u4f18\u7684\u6838\u5fc3\u76ee\u6807\u5f80\u5f80\u662f\u51cf\u5c11 Full GC \u9891\u7387\u2014\u2014\u901a\u8fc7\u5408\u7406\u8bbe\u7f6e\u65b0\u751f\u4ee3\/\u8001\u5e74\u4ee3\u6bd4\u4f8b\u3001\u664b\u5347\u9608\u503c\u3001 Survivor \u5927\u5c0f，\u8ba9\u77ed\u547d\u5bf9\u8c61\u5728\u65b0\u751f\u4ee3\u5c31\u88ab\u6d88\u5316\u6389，\u4e0d\u8fdb\u5165\u8001\u5e74\u4ee3\u6c61\u67d3\u8001\u5e74\u4ee3\u3002<\/p>\n

                    \u8de8\u4ee3\u5f15\u7528\u4e0e\u5361\u8868<\/h3>\n

                    \u5206\u4ee3\u6536\u96c6\u6709\u4e00\u4e2a\u7ed5\u4e0d\u5f00\u7684\u95ee\u9898：\u8de8\u4ee3\u5f15\u7528\u3002\u65b0\u751f\u4ee3\u5bf9\u8c61\u53ef\u80fd\u88ab\u8001\u5e74\u4ee3\u5bf9\u8c61\u5f15\u7528，\u53cd\u4e4b\u4ea6\u7136\u3002Minor GC \u65f6\u5982\u679c\u53ea\u626b\u65b0\u751f\u4ee3\u6839，\u5c31\u4f1a\u6f0f\u6389\u8001\u5e74\u4ee3\u6307\u5411\u65b0\u751f\u4ee3\u7684\u5f15\u7528，\u5bfc\u81f4\u8bef\u56de\u6536\u3002<\/p>\n

                    \u7b80\u5355\u65b9\u6848\u7684\u4ee3\u4ef7<\/h4>\n

                    \u4e00\u79cd\u6734\u7d20\u505a\u6cd5\u662f：Minor GC \u65f6\u628a\u6574\u4e2a\u8001\u5e74\u4ee3\u5f53\u4f5c\u989d\u5916 GC Roots \u6765\u626b\u63cf\u3002\u4f46\u8001\u5e74\u4ee3\u901a\u5e38\u5f88\u5927，\u5168\u626b\u4e00\u904d\u6210\u672c\u4e0d\u53ef\u63a5\u53d7\u3002<\/p>\n

                    \u5361\u8868（Card Table）<\/h4>\n

                    HotSpot \u91c7\u7528\u5361\u8868\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898：\u628a\u8001\u5e74\u4ee3\u5212\u5206\u4e3a\u56fa\u5b9a\u5927\u5c0f\u7684"\u5361\u7247"（Card，\u901a\u5e38\u662f 512 \u5b57\u8282），\u6bcf\u5f20\u5361\u5bf9\u5e94\u5361\u8868\u4e2d\u7684\u4e00\u4e2a\u5b57\u8282\u3002\u5f53\u8001\u5e74\u4ee3\u5bf9\u8c61\u5199\u5165\u4e00\u4e2a\u6307\u5411\u65b0\u751f\u4ee3\u7684\u5f15\u7528\u65f6，\u901a\u8fc7\u5199\u5c4f\u969c\u628a\u5bf9\u5e94\u5361\u6807\u8bb0\u4e3a"\u810f"（dirty）\u3002<\/p>\n

                    \u8001\u5e74\u4ee3: |—\u53610—|—\u53611—|—\u53612—|—\u53613—|
                    \n\u5361\u8868: 0 1 0 0
                    \n dirty<\/p>\n

                    Minor GC \u65f6\u53ea\u626b\u63cf"\u810f\u5361"\u5bf9\u5e94\u7684\u8001\u5e74\u4ee3\u533a\u57df，\u628a\u8fd9\u4e9b\u5bf9\u8c61\u4f5c\u4e3a\u9644\u52a0 GC Roots\u3002\u8fd9\u6837\u628a"\u5168\u626b\u8001\u5e74\u4ee3"\u964d\u4e3a"\u53ea\u626b\u810f\u5361"，\u6781\u5927\u964d\u4f4e\u4e86\u8de8\u4ee3\u5f15\u7528\u7684\u626b\u63cf\u6210\u672c\u3002<\/p>\n

                    \u5199\u5c4f\u969c\u7684\u5f00\u9500<\/h4>\n

                    \u5199\u5c4f\u969c（write barrier）\u662f JVM \u5728\u6bcf\u6b21\u5f15\u7528\u5199\u5165\u65f6\u63d2\u5165\u7684\u989d\u5916\u903b\u8f91\u3002HotSpot \u4f7f\u7528\u7cbe\u5316\u5361\u8868（Card Table Refinement）：\u5199\u5c4f\u969c\u53ea\u505a"\u7f6e\u810f"\u8fd9\u4e00\u6700\u4fbf\u5b9c\u7684\u64cd\u4f5c，\u626b\u63cf\u4ea4\u7ed9 GC \u7ebf\u7a0b\u5f02\u6b65"\u7cbe\u5316"\u3002\u8fd9\u79cd\u8bbe\u8ba1\u5728\u541e\u5410\u91cf\u4e0e\u5ef6\u8fdf\u4e4b\u95f4\u53d6\u5f97\u4e86\u5e73\u8861\u3002<\/p>\n

                    G1 \u8fdb\u4e00\u6b65\u5f15\u5165 Remembered Set（RSet），\u6bcf\u4e2a region \u7ef4\u62a4\u6307\u5411\u81ea\u5df1\u7684\u5361\u8868\u96c6\u5408，\u5b9e\u73b0"\u8c01\u6307\u5411\u6211"\u7684\u53cd\u5411\u7d22\u5f15\u3002ZGC \u548c Shenandoah \u5219\u901a\u8fc7\u67d3\u8272\u6307\u9488\u4e0e\u5e76\u53d1\u6574\u7406\u89c4\u907f\u4e86\u5361\u8868\u7684\u90e8\u5206\u5f00\u9500\u3002<\/p>\n

                    \u5176\u4ed6\u8bb0\u5fc6\u96c6\u5b9e\u73b0<\/h4>\n

                    \u9664\u5361\u8868\u5916，\u8bb0\u5fc6\u96c6\u8fd8\u6709\u51e0\u79cd\u5b9e\u73b0：<\/p>\n

                      \n
                    • \u5b57\u8282\u6570\u7ec4（HotSpot \u5361\u8868）：\u6bcf 512B \u4e00\u5b57\u8282\u3002<\/li>\n
                    • \u4f4d\u56fe：\u6bcf\u4e2a\u5bf9\u8c61\u5bf9\u5e94\u4e00\u4e2a bit，\u66f4\u7cbe\u786e\u4f46\u66f4\u65b0\u6210\u672c\u9ad8\u3002<\/li>\n
                    • \u5bf9\u8c61\u6570\u7ec4：\u7cbe\u786e\u8bb0\u5f55\u5f15\u7528\u5bf9\u8c61，\u5185\u5b58\u5360\u7528\u5927\u3002<\/li>\n<\/ul>\n

                      \u5361\u8868\u662f\u7cbe\u5ea6\u4e0e\u6210\u672c\u7684\u6298\u4e2d\u9009\u62e9，\u4e5f\u662f HotSpot \u957f\u671f\u6cbf\u7528\u7684\u65b9\u6848\u3002<\/p>\n

                      \u5404\u7b97\u6cd5\u4f18\u7f3a\u70b9\u5bf9\u6bd4<\/h3>\n\n\u7b97\u6cd5\u662f\u5426\u79fb\u52a8\u788e\u7247\u7a7a\u95f4\u5f00\u9500\u505c\u987f\u65f6\u95f4\u9002\u7528\u573a\u666f<\/tr>\n\n\n\n\n\n
                      Mark-Sweep<\/td>\n\u5426<\/td>\n\u6709<\/td>\n\u65e0\u989d\u5916\u5f00\u9500<\/td>\n\u4e2d\u7b49<\/td>\n\u8001\u5e74\u4ee3\u3001\u4f4e\u5ef6\u8fdf\u573a\u666f（CMS）<\/td>\n<\/tr>\n
                      Copying<\/td>\n\u662f<\/td>\n\u65e0<\/td>\n\u6d6a\u8d39\u4e00\u534a（\u6216 10%）<\/td>\n\u77ed（\u5b58\u6d3b\u5c11\u65f6）<\/td>\n\u65b0\u751f\u4ee3\u3001Survivor \u533a<\/td>\n<\/tr>\n
                      Mark-Compact<\/td>\n\u662f<\/td>\n\u65e0<\/td>\n\u65e0\u989d\u5916\u5f00\u9500<\/td>\n\u957f<\/td>\n\u8001\u5e74\u4ee3\u3001\u541e\u5410\u91cf\u4f18\u5148<\/td>\n<\/tr>\n
                      Generational<\/td>\n\u89c6\u4ee3\u800c\u5b9a<\/td>\n\u89c6\u4ee3\u800c\u5b9a<\/td>\n\u7efc\u5408\u53ef\u63a7<\/td>\n\u7efc\u5408\u8f83\u4f18<\/td>\n\u4e3b\u6d41 JVM \u9ed8\u8ba4\u7b56\u7565<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                      \u9009\u62e9\u4f9d\u636e\u53ef\u4ee5\u5f52\u7eb3\u4e3a\u4e24\u6761\u4e3b\u7ebf：<\/p>\n

                        \n
                      • \u541e\u5410\u91cf\u4f18\u5148：\u9009\u62e9 Mark-Compact，\u505c\u987f\u957f\u4f46\u7a7a\u95f4\u5229\u7528\u7387\u9ad8\u3002<\/li>\n
                      • \u5ef6\u8fdf\u4f18\u5148：\u9009\u62e9 Mark-Sweep \u6216\u590d\u5236\u7b97\u6cd5，\u505c\u987f\u77ed\u4f46\u6709\u788e\u7247\u6216\u7a7a\u95f4\u6d6a\u8d39\u3002<\/li>\n<\/ul>\n

                        \u73b0\u4ee3\u6536\u96c6\u5668（G1\u3001ZGC\u3001Shenandoah）\u901a\u8fc7\u5206\u533a（Region） + \u5e76\u53d1\u6574\u7406\u6253\u7834\u4e86"\u5fc5\u987b\u4e8c\u9009\u4e00"\u7684\u56f0\u5c40，\u4f46\u5e95\u5c42\u4ecd\u4ee5\u8fd9\u56db\u79cd\u7b97\u6cd5\u4e3a\u6839\u57fa\u3002<\/p>\n

                        \u4ee3\u7801\u793a\u4f8b：\u89c2\u5bdf\u4e0d\u540c\u7b97\u6cd5\u7684\u884c\u4e3a<\/h3>\n

                        \/**
                        \n * \u6f14\u793a\u5206\u4ee3 GC \u4e0b\u4e0d\u540c\u5bf9\u8c61\u7684\u751f\u547d\u5468\u671f
                        \n * \u9002\u7528 JDK 8\/11\/17
                        \n *
                        \n * \u8fd0\u884c\u53c2\u6570：
                        \n * java -Xms20m -Xmx20m -Xmn10m
                        \n * -XX:SurvivorRatio=8 -XX:+UseSerialGC
                        \n * -Xlog:gc* -cp MyApp GcAlgorithmDemo
                        \n *\/<\/span>
                        \npublic<\/span> class<\/span> GcAlgorithmDemo<\/span> {<\/span><\/p>\n

                        private<\/span> static<\/span> final<\/span> int<\/span> _1MB =<\/span> 1024<\/span> *<\/span> 1024<\/span>;<\/span><\/p>\n

                        public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> throws<\/span> Exception<\/span> {<\/span>
                        \n \/\/ \u77ed\u547d\u5bf9\u8c61，\u65b0\u751f\u4ee3\u4e2d\u5373\u88ab\u56de\u6536<\/span>
                        \n for<\/span> (<\/span>int<\/span> i =<\/span> 0<\/span>;<\/span> i <<\/span> 100<\/span>;<\/span> i++<\/span>)<\/span> {<\/span>
                        \n allocateTransient<\/span>(<\/span>)<\/span>;<\/span>
                        \n }<\/span><\/p>\n

                        \/\/ \u957f\u547d\u5bf9\u8c61，\u4f1a\u664b\u5347\u5230\u8001\u5e74\u4ee3<\/span>
                        \n byte<\/span>[<\/span>]<\/span> longLived =<\/span> new<\/span> byte<\/span>[<\/span>4<\/span> *<\/span> _1MB]<\/span>;<\/span><\/p>\n

                        \/\/ \u518d\u5206\u914d\u4e00\u6279，\u89e6\u53d1 Minor GC<\/span>
                        \n for<\/span> (<\/span>int<\/span> i =<\/span> 0<\/span>;<\/span> i <<\/span> 5<\/span>;<\/span> i++<\/span>)<\/span> {<\/span>
                        \n byte<\/span>[<\/span>]<\/span> tmp =<\/span> new<\/span> byte<\/span>[<\/span>2<\/span> *<\/span> _1MB]<\/span>;<\/span>
                        \n Thread<\/span>.<\/span>sleep<\/span>(<\/span>200<\/span>)<\/span>;<\/span>
                        \n }<\/span>
                        \n }<\/span><\/p>\n

                        static<\/span> void<\/span> allocateTransient<\/span>(<\/span>)<\/span> {<\/span>
                        \n byte<\/span>[<\/span>]<\/span> tmp =<\/span> new<\/span> byte<\/span>[<\/span>512<\/span> *<\/span> 1024<\/span>]<\/span>;<\/span> \/\/ 512KB<\/span>
                        \n \/\/ \u65b9\u6cd5\u8fd4\u56de，tmp \u5931\u53bb\u5f15\u7528，\u4e0b\u6b21 Minor GC \u5373\u88ab\u56de\u6536<\/span>
                        \n }<\/span>
                        \n}<\/span><\/p>\n

                        JDK 11+ \u7684 GC \u65e5\u5fd7：<\/p>\n

                        java<\/span> -Xlog:gc*=<\/span>info -cp<\/span> MyApp GcAlgorithmDemo<\/p>\n

                        \u8f93\u51fa\u4e2d\u53ef\u4ee5\u770b\u5230：<\/p>\n

                          \n
                        • GC(0) Pause Young (Allocation Failure) \u2014\u2014 \u65b0\u751f\u4ee3\u5206\u914d\u5931\u8d25\u89e6\u53d1 Minor GC，\u4f7f\u7528\u590d\u5236\u7b97\u6cd5\u3002<\/li>\n
                        • \u540e\u7eed Pause Full \u8868\u793a\u664b\u5347\u5931\u8d25\u6216\u8001\u5e74\u4ee3\u7a7a\u95f4\u4e0d\u8db3，\u89e6\u53d1 Full GC，\u4f7f\u7528 Mark-Compact\u3002<\/li>\n<\/ul>\n

                          \u901a\u8fc7\u5bf9\u6bd4 -XX:+UseSerialGC（Mark-Compact \u8001\u5e74\u4ee3）\u548c -XX:+UseConcMarkSweepGC（Mark-Sweep \u8001\u5e74\u4ee3）\u7684\u65e5\u5fd7，\u53ef\u4ee5\u76f4\u89c2\u611f\u53d7\u4e24\u79cd\u7b97\u6cd5\u5728\u505c\u987f\u65f6\u95f4\u548c\u788e\u7247\u8868\u73b0\u4e0a\u7684\u5dee\u5f02\u3002<\/p>\n

                          \u5b9e\u8df5\u8981\u70b9<\/h3>\n

                          1. \u4e0d\u8981\u76f2\u76ee\u6269\u5927\u65b0\u751f\u4ee3<\/p>\n

                          \u65b0\u751f\u4ee3\u8fc7\u5927\u4f1a\u8ba9 Minor GC \u5468\u671f\u53d8\u957f\u4f46\u5355\u6b21\u505c\u987f\u589e\u52a0；\u65b0\u751f\u4ee3\u8fc7\u5c0f\u5219 Minor GC \u9891\u7e41\u3001\u664b\u5347\u538b\u529b\u5927\u3002\u4e00\u822c\u5efa\u8bae\u65b0\u751f\u4ee3\u5360\u5806\u7684 1\/3 ~ 1\/2\u3002<\/p>\n

                          2. Survivor \u4e0d\u80fd\u592a\u5c0f<\/p>\n

                          Survivor \u592a\u5c0f\u4f1a\u5bfc\u81f4\u5b58\u6d3b\u5bf9\u8c61\u653e\u4e0d\u4e0b，\u76f4\u63a5\u664b\u5347\u8001\u5e74\u4ee3，\u9020\u6210"\u8fc7\u65e9\u664b\u5347"\u3002\u76d1\u63a7 -XX:+PrintAdaptiveSizePolicy（JDK 8）\u6216 -Xlog:gc+ergo（JDK 11+）\u53ef\u770b\u5230 JVM \u52a8\u6001\u8c03\u6574 Survivor \u5927\u5c0f\u7684\u8fc7\u7a0b\u3002<\/p>\n

                          3. CMS \u7684\u788e\u7247\u4ee3\u4ef7<\/p>\n

                          CMS \u91c7\u7528 Mark-Sweep，\u957f\u671f\u8fd0\u884c\u540e\u788e\u7247\u4f1a\u89e6\u53d1\u5e76\u53d1\u6a21\u5f0f\u5931\u8d25（Concurrent Mode Failure），\u9000\u5316\u4e3a Serial Old \u7684 Mark-Compact Full GC，\u505c\u987f\u53ef\u80fd\u8fbe\u5230\u79d2\u7ea7\u3002\u8fd9\u662f CMS \u88ab G1 \u53d6\u4ee3\u7684\u5173\u952e\u539f\u56e0\u3002<\/p>\n

                          4. G1 \u7684"\u6df7\u5408\u56de\u6536"\u672c\u8d28<\/p>\n

                          G1 \u7684 Mixed GC \u65e2\u56de\u6536 Young Region \u53c8\u56de\u6536\u90e8\u5206 Old Region，\u76f8\u5f53\u4e8e\u628a\u5206\u4ee3\u6536\u96c6\u4e0e\u5206\u533a\u7ed3\u5408\u3002\u7406\u89e3\u4e86 Copying + \u5361\u8868，\u518d\u770b G1 \u4f1a\u987a\u7406\u6210\u7ae0\u3002<\/p>\n

                          5. \u76d1\u63a7\u5bf9\u8c61\u664b\u5347\u901f\u7387<\/p>\n

                          \u901a\u8fc7 jstat -gc <pid> 1s \u89c2\u5bdf\u8001\u5e74\u4ee3\u4f7f\u7528\u91cf\u589e\u957f\u901f\u7387\u3002\u5982\u679c\u589e\u957f\u8fc7\u5feb，\u8bf4\u660e\u77ed\u547d\u5bf9\u8c61\u9003\u9038\u5230\u4e86\u8001\u5e74\u4ee3，\u5e94\u6392\u67e5 Survivor \u914d\u7f6e\u6216\u5927\u5bf9\u8c61\u9608\u503c -XX:PretenureSizeThreshold\u3002<\/p>\n

                          \u5c0f\u7ed3<\/h3>\n
                            \n
                          • Mark-Sweep：\u5b9e\u73b0\u7b80\u5355，\u4f46\u4ea7\u751f\u788e\u7247，\u9002\u5408\u4f4e\u5ef6\u8fdf\u573a\u666f\u3002<\/li>\n
                          • Copying：\u65e0\u788e\u7247\u3001\u5206\u914d\u5feb，\u4f46\u6d6a\u8d39\u7a7a\u95f4，\u9002\u5408\u65b0\u751f\u4ee3\u3002<\/li>\n
                          • Mark-Compact：\u65e0\u788e\u7247\u3001\u7a7a\u95f4\u5229\u7528\u7387\u9ad8，\u4f46\u505c\u987f\u957f，\u9002\u5408\u8001\u5e74\u4ee3\u3002<\/li>\n
                          • Generational：\u57fa\u4e8e\u5f31\u4ee3\u5047\u8bf4，\u5206\u800c\u6cbb\u4e4b，\u662f\u4e3b\u6d41 JVM \u7684\u57fa\u7840\u6846\u67b6\u3002<\/li>\n
                          • \u5361\u8868\u901a\u8fc7\u5199\u5c4f\u969c\u8bb0\u5f55\u8de8\u4ee3\u5f15\u7528，\u628a"\u5168\u626b\u8001\u5e74\u4ee3"\u964d\u4e3a"\u53ea\u626b\u810f\u5361"，\u662f\u5206\u4ee3\u6536\u96c6\u7684\u5173\u952e\u652f\u6491\u3002<\/li>\n<\/ul>\n

                            \u4e0b\u4e00\u7bc7\u6211\u4eec\u5c06\u8fdb\u5165\u5177\u4f53\u7684\u6536\u96c6\u5668\u5b9e\u73b0，\u5148\u770b\u6700\u65e9\u51fa\u73b0\u3001\u4e5f\u6700\u7b80\u5355\u7684\u4e24\u4e2a：Serial \u4e0e ParNew\u3002<\/p>\n

                            \u66f4\u591a\u5185\u5bb9：JVM\u8c03\u4f18\u5b9e\u6218<\/p>\n","protected":false},"excerpt":{"rendered":"

                            24-\u5783\u573e\u56de\u6536\u7b97\u6cd5：\u6807\u8bb0-\u6e05\u9664\u3001\u590d\u5236\u3001\u6574\u7406\u4e0e\u5206\u4ee3
                            \n\u77e5\u9053\u4e86\\”\u54ea\u4e9b\u5bf9\u8c61\u6d3b\u7740\u3001\u54ea\u4e9b\u8be5\u6b7b\\”，\u4e0b\u4e00\u6b65\u5c31\u662f\\”\u5982\u4f55\u9ad8\u6548\u56de\u6536\u6b7b\u5bf9\u8c61\\”\u3002GC \u7b97\u6cd5\u7ecf\u8fc7\u51e0\u5341\u5e74\u7684\u6f14\u5316，\u6c89\u6dc0\u51fa\u56db\u79cd\u57fa\u7840\u8303\u5f0f：Mark-Sweep（\u6807\u8bb0-\u6e05\u9664）\u3001Copying（\u590d\u5236）\u3001Mark-Compact（\u6807\u8bb0-\u6574\u7406） \u548c Generational（\u5206\u4ee3\u6536\u96c6）\u3002\u672c<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[426,427],"topic":[],"class_list":["post-87859","post","type-post","status-publish","format-standard","hentry","category-server","tag-jvm","tag-427"],"yoast_head":"\n\u3010JVM\u539f\u7406\u8be6\u89e3\u301124-\u5783\u573e\u56de\u6536\u7b97\u6cd5-\u6807\u8bb0\u6e05\u9664\u590d\u5236\u6574\u7406\u5206\u4ee3 - 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