{"id":199,"date":"2020-03-12T21:15:07","date_gmt":"2020-03-12T13:15:07","guid":{"rendered":"https:\/\/blog.frost-s.tk\/?p=199"},"modified":"2022-08-10T17:11:14","modified_gmt":"2022-08-10T09:11:14","slug":"jvm%e6%a2%b3%e7%90%86-2","status":"publish","type":"post","link":"https:\/\/blog.frost-s.com\/index.php\/2020\/03\/12\/jvm%e6%a2%b3%e7%90%86-2\/","title":{"rendered":"JVM\u68b3\u7406"},"content":{"rendered":"\n

\u4e00\u3001java\u57fa\u7840\u77e5\u8bc6\u56de\u987e<\/h2>\n\n\n\n

1. \u5982\u4f55\u8ba1\u7b97\u5bf9\u8c61\u5df2\u6b7b<\/h3>\n\n\n\n

1.1 \u5f15\u7528\u8ba1\u6570\u5668\u7b97\u6cd5<\/h4>\n\n\n\n

\u5f15\u7528\u8ba1\u6570\u5668\u7b97\u6cd5\u662f\u7ed9\u6bcf\u4e2a\u5bf9\u8c61\u8bbe\u7f6e\u4e00\u4e2a\u8ba1\u6570\u5668\uff0c\u5f53\u6709\u5730\u65b9\u5f15\u7528\u8fd9\u4e2a\u5bf9\u8c61\u7684\u65f6\u5019\uff0c\u8ba1\u6570\u5668+1\uff0c\u5f53\u5f15\u7528\u5931\u6548\u7684\u65f6\u5019\uff0c\u8ba1\u6570\u5668-1\uff0c\u5f53\u8ba1\u6570\u5668\u4e3a0\u7684\u65f6\u5019\uff0cJVM\u5c31\u8ba4\u4e3a\u5bf9\u8c61\u4e0d\u518d\u88ab\u4f7f\u7528\uff0c\u662f\u201c\u5783\u573e\u201d\u4e86\u3002<\/p>\n\n\n\n

\u5f15\u7528\u8ba1\u6570\u5668\u5b9e\u73b0\u7b80\u5355\uff0c\u6548\u7387\u9ad8\uff1b\u4f46\u662f\u4e0d\u80fd\u89e3\u51b3\u5faa\u73af\u5f15\u7528\u95ee\u95ee\u9898\uff08A\u5bf9\u8c61\u5f15\u7528B\u5bf9\u8c61\uff0cB\u5bf9\u8c61\u53c8\u5f15\u7528A\u5bf9\u8c61\uff0c\u4f46\u662fA,B\u5bf9\u8c61\u5df2\u4e0d\u88ab\u4efb\u4f55\u5176\u4ed6\u5bf9\u8c61\u5f15\u7528\uff09\uff0c\u540c\u65f6\u6bcf\u6b21\u8ba1\u6570\u5668\u7684\u589e\u52a0\u548c\u51cf\u5c11\u90fd\u5e26\u6765\u4e86\u5f88\u591a\u989d\u5916\u7684\u5f00\u9500\uff0c\u6240\u4ee5\u5728JDK1.1\u4e4b\u540e\uff0c\u8fd9\u4e2a\u7b97\u6cd5\u5df2\u7ecf\u4e0d\u518d\u4f7f\u7528\u4e86\u3002<\/p>\n\n\n\n

1.2 \u53ef\u8fbe\u6027\u5206\u6790\u7b97\u6cd5<\/h4>\n\n\n\n

\u53ef\u8fbe\u6027\u5206\u6790\u7b97\u6cd5\u662f\u901a\u8fc7\u4e00\u4e9b\u201cGC Roots\u201d\u5bf9\u8c61\u4f5c\u4e3a\u8d77\u70b9\uff0c\u4ece\u8fd9\u4e9b\u8282\u70b9\u5f00\u59cb\u5f80\u4e0b\u641c\u7d22\uff0c\u641c\u7d22\u901a\u8fc7\u7684\u8def\u5f84\u6210\u4e3a\u5f15\u7528\u94fe\uff08Reference Chain\uff09\uff0c\u5f53\u4e00\u4e2a\u5bf9\u8c61\u6ca1\u6709\u88abGC Roots\u7684\u5f15\u7528\u94fe\u8fde\u63a5\u7684\u65f6\u5019\uff0c\u8bf4\u660e\u8fd9\u4e2a\u5bf9\u8c61\u662f\u4e0d\u53ef\u7528\u7684,\u5982\u4e0b\u56fe\u6240\u793a\u3002<\/p>\n\n\n\n

\"\"<\/div><\/a><\/figure>\n\n\n\n

GC Roots\u5bf9\u8c61\u5305\u62ec\uff1a<\/p>\n\n\n\n

  1. \u865a\u62df\u673a\u6808\uff08\u6808\u5e27\u4e2d\u7684\u672c\u5730\u53d8\u91cf\u8868\uff09\u4e2d\u7684\u5f15\u7528\u7684\u5bf9\u8c61\u3002<\/li>
  2. \u65b9\u6cd5\u533a\u57df\u4e2d\u7684\u7c7b\u9759\u6001\u5c5e\u6027\u5f15\u7528\u7684\u5bf9\u8c61\u3002<\/li>
  3. \u65b9\u6cd5\u533a\u57df\u4e2d\u5e38\u91cf\u5f15\u7528\u7684\u5bf9\u8c61\u3002<\/li>
  4. \u672c\u5730\u65b9\u6cd5\u6808\u4e2dJNI\uff08Native\u65b9\u6cd5\uff09\u7684\u5f15\u7528\u7684\u5bf9\u8c61\u3002<\/li><\/ol>\n\n\n\n

    \u4e0a\u9762\u53ea\u662f\u6807\u8bb0\u4e86\u5bf9\u8c61\u662f\u5426\u53ef\u4ee5\u88ab\u56de\u6536,\u5b9e\u9645\u4e0a\u5728java\u4e2d\u9996\u5148\u4f1a\u6807\u8bb0\u4e0b\u5bf9\u8c61\uff0c\u4f1a\u8c03\u7528\u5bf9\u8c61\u91cc\u9762\u7684protected void finalize()<\/code>\u8fd9\u4e2a\u65b9\u6cd5\uff0c\u8fd9\u4e2a\u65f6\u5019\u5bf9\u8c61\u8fd8\u6709\u6551\uff0c\u53ea\u8981\u5728\u8fd9\u4e2a\u65b9\u6cd5\u628a\u8be5\u5bf9\u8c61\u548c\u5f15\u7528\u94fe\u5bf9\u63a5\u4e0a\uff0c\u5176\u5b9e\u53ef\u4ee5\u9003\u8131\u88ab\u56de\u6536<\/p><\/blockquote>\n\n\n\n

    2. \u56de\u6536\u7684\u533a\u57df<\/h3>\n\n\n\n
    1. \u65b0\u751f\u4ee3<\/li>
    2. \u6c38\u4e45\u4ee3<\/li><\/ol>\n\n\n\n

      \u65b0\u751f\u4ee3\uff0c\u8fd9\u4e2a\u5f88\u5bb9\u6613\u7406\u89e3\uff0c\u4e00\u822c\u6765\u8bf4\u6c38\u4e45\u5e26\u662f\u6700\u4e0d\u597d\u56de\u6536\u7684\u3002\u6c38\u4e45\u4ee3\u4e3b\u8981\u56de\u6536\u4ee5\u4e0b\u90e8\u5206\u5185\u5bb9\uff1a<\/p>\n\n\n\n

      1. \u5e9f\u5f03\u5e38\u91cf<\/li>
      2. \u65e0\u7528\u7684\u7c7b<\/li><\/ol>\n\n\n\n

        3. \u5783\u573e\u56de\u6536\u7b97\u6cd5<\/h3>\n\n\n\n

        3.1 \u6807\u8bb0\u2014\u6e05\u9664\u7b97\u6cd5<\/h4>\n\n\n\n

        \u6807\u8bb0\u2014\u6e05\u9664\u7b97\u6cd5\u5305\u62ec\u4e24\u4e2a\u9636\u6bb5\uff1a\u201c\u6807\u8bb0\u201d\u548c\u201c\u6e05\u9664\u201d\u3002\u5728\u6807\u8bb0\u9636\u6bb5\uff0c\u786e\u5b9a\u6240\u6709\u8981\u56de\u6536\u7684\u5bf9\u8c61\uff0c\u5e76\u505a\u6807\u8bb0\u3002\u6e05\u9664\u9636\u6bb5\u7d27\u968f\u6807\u8bb0\u9636\u6bb5\uff0c\u5c06\u6807\u8bb0\u9636\u6bb5\u786e\u5b9a\u4e0d\u53ef\u7528\u7684\u5bf9\u8c61\u6e05\u9664\u3002<\/p>\n\n\n\n

        \u6807\u8bb0\u2014\u6e05\u9664\u7b97\u6cd5\u662f\u57fa\u7840\u7684\u6536\u96c6\u7b97\u6cd5\uff0c\u6807\u8bb0\u548c\u6e05\u9664\u9636\u6bb5\u7684\u6548\u7387\u4e0d\u9ad8\uff0c\u800c\u4e14\u6e05\u9664\u540e\u56de\u4ea7\u751f\u5927\u91cf\u7684\u4e0d\u8fde\u7eed\u7a7a\u95f4\uff0c\u8fd9\u6837\u5f53\u7a0b\u5e8f\u9700\u8981\u5206\u914d\u5927\u5185\u5b58\u5bf9\u8c61\u65f6\uff0c\u53ef\u80fd\u65e0\u6cd5\u627e\u5230\u8db3\u591f\u7684\u8fde\u7eed\u7a7a\u95f4\u3002\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n\n\n\n

        \"\"\/<\/div><\/a><\/figure>\n\n\n\n

        3.2 \u590d\u5236\u7b97\u6cd5<\/h4>\n\n\n\n

        \u590d\u5236\u7b97\u6cd5\u662f\u628a\u5185\u5b58\u5206\u6210\u5927\u5c0f\u76f8\u7b49\u7684\u4e24\u5757\uff0c\u6bcf\u6b21\u4f7f\u7528\u5176\u4e2d\u4e00\u5757\uff0c\u5f53\u5783\u573e\u56de\u6536\u7684\u65f6\u5019\uff0c\u628a\u5b58\u6d3b\u7684\u5bf9\u8c61\u590d\u5236\u5230\u53e6\u4e00\u5757\u4e0a\uff0c\u7136\u540e\u628a\u8fd9\u5757\u5185\u5b58\u6574\u4e2a\u6e05\u7406\u6389\u3002\u8fd9\u79cd\u65b9\u5f0f\u542c\u4e0a\u53bb\u786e\u5b9e\u662f\u975e\u5e38\u4e0d\u9519\u7684\u65b9\u6848\uff0c\u4f46\u662f\u603b\u7684\u6765\u8bf4\u5bf9\u5185\u5b58\u7684\u6d88\u8017\u5341\u5206\u9ad8\u3002<\/p>\n\n\n\n

        \"\"\/<\/div><\/a><\/figure>\n\n\n\n

        \u590d\u5236\u7b97\u6cd5\u5b9e\u73b0\u7b80\u5355\uff0c\u8fd0\u884c\u6548\u7387\u9ad8\uff0c\u4f46\u662f\u7531\u4e8e\u6bcf\u6b21\u53ea\u80fd\u4f7f\u7528\u5176\u4e2d\u7684\u4e00\u534a\uff0c\u9020\u6210\u5185\u5b58\u7684\u5229\u7528\u7387\u4e0d\u9ad8\u3002\u73b0\u5728\u7684JVM\u7528\u590d\u5236\u65b9\u6cd5\u6536\u96c6\u65b0\u751f\u4ee3\uff0c\u7531\u4e8e\u65b0\u751f\u4ee3\u4e2d\u5927\u90e8\u5206\u5bf9\u8c61\uff0898%\uff09\u90fd\u662f\u671d\u751f\u5915\u6b7b\u7684\uff0c\u6240\u4ee5\u4e24\u5757\u5185\u5b58\u7684\u6bd4\u4f8b\u4e0d\u662f1:1(\u5927\u6982\u662f8:1)\uff0c\u4e5f\u5c31\u662f\u5e38\u63d0\u5230\u7684\u4e00\u5757Eden(80%)\u548c\u4e24\u5757Survivor(20%)\u3002\u5f53\u7136\u4e5f\u4f1a\u5b58\u572810%\u4e0d\u591f\u7528\u7684\u60c5\u51b5\uff0c\u8fd9\u4e2a\u540e\u9762\u5728\u8fdb\u884c\u68b3\u7406\uff0c\u4f1a\u6709\u4e00\u4e2a\u8865\u507f\u673a\u5236\uff0c\u4e5f\u5c31\u662f\u5206\u914d\u62c5\u4fdd <\/p>\n\n\n\n

        3.3 \u6807\u8bb0\u2014\u6574\u7406\u7b97\u6cd5<\/h4>\n\n\n\n

        \u590d\u5236\u6536\u96c6\u7b97\u6cd5\u4f1a\u5b58\u5728\u4e00\u79cd\u6781\u7aef\u60c5\u51b5\uff0c\u5c31\u662f\u5bf9\u8c61\u90fd\u6ca1\u6b7b\u3002\u8fd9\u79cd\u60c5\u51b5\u4f1a\u5728\u8001\u5e74\u4ee3\u6709\u51e0\u7387\u7684\u51fa\u73b0\uff0c\u6240\u4ee5\u6839\u636e\u8001\u5e74\u4ee3\u7684\u7279\u70b9\u63d0\u51fa\u4e86\u6807\u8bb0\u2014\u6574\u7406\u7b97\u6cd5<\/code>\u3002 \u6807\u8bb0\u2014\u6574\u7406\u7b97\u6cd5\u548c\u6807\u8bb0\u2014\u6e05\u9664\u7b97\u6cd5\u4e00\u6837\uff0c\u4f46\u662f\u6807\u8bb0\u2014\u6574\u7406\u7b97\u6cd5\u4e0d\u662f\u628a\u5b58\u6d3b\u5bf9\u8c61\u590d\u5236\u5230\u53e6\u4e00\u5757\u5185\u5b58\uff0c\u800c\u662f\u628a\u5b58\u6d3b\u5bf9\u8c61\u5f80\u5185\u5b58\u7684\u4e00\u7aef\u79fb\u52a8\uff0c\u7136\u540e\u76f4\u63a5\u56de\u6536\u8fb9\u754c\u4ee5\u5916\u7684\u5185\u5b58\uff0c\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n\n\n\n

        \"\"\/<\/div><\/a><\/figure>\n\n\n\n

        3.4 \u5206\u4ee3\u6536\u96c6<\/h4>\n\n\n\n

        \u5206\u4ee3\u6536\u96c6\u662f\u6839\u636e\u5bf9\u8c61\u7684\u5b58\u6d3b\u65f6\u95f4\u628a\u5185\u5b58\u5206\u4e3a\u65b0\u751f\u4ee3\u548c\u8001\u5e74\u4ee3\uff0c\u6839\u636e\u4e2a\u4ee3\u5bf9\u8c61\u7684\u5b58\u6d3b\u7279\u70b9\uff0c\u6bcf\u4e2a\u4ee3\u91c7\u7528\u4e0d\u540c\u7684\u5783\u573e\u56de\u6536\u7b97\u6cd5\u3002\u65b0\u751f\u4ee3\u91c7\u7528\u6807\u8bb0\u2014\u590d\u5236\u7b97\u6cd5\uff0c\u8001\u5e74\u4ee3\u91c7\u7528\u6807\u8bb0\u2014\u6574\u7406\u7b97\u6cd5\u3002+<\/p>\n\n\n\n

        \u5783\u573e\u7b97\u6cd5\u7684\u5b9e\u73b0\u6d89\u53ca\u5927\u91cf\u7684\u7a0b\u5e8f\u7ec6\u8282\uff0c\u800c\u4e14\u4e0d\u540c\u7684\u865a\u62df\u673a\u5e73\u53f0\u5b9e\u73b0\u7684\u65b9\u6cd5\u4e5f\u5404\u4e0d\u76f8\u540c\u3002\u4e0a\u9762\u4ecb\u7ecd\u7684\u53ea\u4e0d\u8fc7\u662f\u57fa\u672c\u601d\u60f3\u3002<\/p>\n\n\n\n

        2\u3001\u5783\u573e\u6536\u96c6\u5668<\/h2>\n\n\n\n
        \"\"\/<\/div><\/a><\/figure>\n\n\n\n

        \u4e0a\u9762\u662f\u76ee\u524d\u6bd4\u8f83\u5e38\u7528\u7684\u5783\u573e\u6536\u96c6\u5668\uff0c\u548c\u4ed6\u4eec\u76f4\u63a5\u642d\u914d\u4f7f\u7528\u7684\u60c5\u51b5\uff0c\u4e0a\u9762\u662f\u65b0\u751f\u4ee3\u6536\u96c6\u5668\uff0c\u4e0b\u9762\u5219\u662f\u8001\u5e74\u4ee3\u6536\u96c6\u5668\uff0c\u8fd9\u4e9b\u6536\u96c6\u9f50\u90fd\u6709\u81ea\u5df1\u7684\u7279\u70b9\uff0c\u6839\u636e\u4e0d\u540c\u7684\u4e1a\u52a1\u573a\u666f\u8fdb\u884c\u642d\u914d\u4f7f\u7528\u3002<\/p>\n\n\n\n

        \u6536\u96c6\u5668<\/h3>\n\n\n\n

        1.1 Serial\u6536\u96c6\u5668<\/h4>\n\n\n\n

        Serial\u6536\u96c6\u5668\u662f\u4e00\u4e2a\u65b0\u751f\u4ee3\u6536\u96c6\u5668\uff0c\u5355\u7ebf\u7a0b\u6267\u884c\uff0c\u4f7f\u7528\u590d\u5236\u7b97\u6cd5\u3002\u5b83\u5728\u8fdb\u884c\u5783\u573e\u6536\u96c6\u65f6\uff0c\u5fc5\u987b\u6682\u505c\u5176\u4ed6\u6240\u6709\u7684\u5de5\u4f5c\u7ebf\u7a0b(\u7528\u6237\u7ebf\u7a0b)\u4e5f\u5c31\u662f\u4f20\u8bf4\u4e2d\u7684Stop The World<\/code>\u3002\u662fJvm client\u6a21\u5f0f\u4e0b\u9ed8\u8ba4\u7684\u65b0\u751f\u4ee3\u6536\u96c6\u5668\u3002\u5bf9\u4e8e\u9650\u5b9a\u5355\u4e2aCPU\u7684\u73af\u5883\u6765\u8bf4\uff0cSerial\u6536\u96c6\u5668\u7531\u4e8e\u6ca1\u6709\u7ebf\u7a0b\u4ea4\u4e92\u7684\u5f00\u9500\uff0c\u4e13\u5fc3\u505a\u5783\u573e\u6536\u96c6\u81ea\u7136\u53ef\u4ee5\u83b7\u5f97\u6700\u9ad8\u7684\u5355\u7ebf\u7a0b\u6536\u96c6\u6548\u7387\u3002<\/p>\n\n\n\n

        1.2 ParNew\u6536\u96c6\u5668<\/h4>\n\n\n\n

        ParNew\u6536\u96c6\u5668\u5176\u5b9e\u5c31\u662fserial\u6536\u96c6\u5668\u7684\u591a\u7ebf\u7a0b\u7248\u672c\uff0c\u9664\u4e86\u4f7f\u7528\u591a\u6761\u7ebf\u7a0b\u8fdb\u884c\u5783\u573e\u6536\u96c6\u4e4b\u5916\uff0c\u5176\u4f59\u884c\u4e3a\u4e0eSerial\u6536\u96c6\u5668\u4e00\u6837\u3002 \u4f7f\u7528\u65b9\u5f0f\u53ef\u4ee5\u4f7f\u7528-XX:+UseConcMarkSweepGC<\/code>\uff0c\u6216\u8005\u662f\u4f7f\u7528-XX:+UseParNewGC<\/code>\u6765\u5f3a\u5236\u5f00\u542f\uff0c\u53ef\u4ee5\u901a\u8fc7-XX:ParallelGCThreads<\/code> \u6765\u8c03\u6574\u6216\u8005\u9650\u5236\u5783\u573e\u6536\u96c6\u7684\u7ebf\u7a0b\u6570\u91cf\u3002<\/p>\n\n\n\n

        1.3 Parallel Scavenge\u6536\u96c6\u5668<\/h4>\n\n\n\n

        Parallel Scavenge\u6536\u96c6\u5668\u4e5f\u662f\u4e00\u4e2a\u65b0\u751f\u4ee3\u6536\u96c6\u5668\uff0c\u5b83\u4e5f\u662f\u4f7f\u7528\u590d\u5236\u7b97\u6cd5\u7684\u6536\u96c6\u5668\uff0c\u53c8\u662f\u5e76\u884c\u591a\u7ebf\u7a0b\u6536\u96c6\u5668\u3002parallel Scavenge\u6536\u96c6\u5668\u7684\u7279\u70b9\u662f\u5b83\u7684\u5173\u6ce8\u70b9\u4e0e\u5176\u4ed6\u6536\u96c6\u5668\u4e0d\u540c\uff0cCMS\u7b49\u6536\u96c6\u5668\u7684\u5173\u6ce8\u70b9\u662f\u5c3d\u53ef\u80fd\u5730\u7f29\u77ed\u5783\u573e\u6536\u96c6\u65f6\u7528\u6237\u7ebf\u7a0b\u7684\u505c\u987f\u65f6\u95f4\uff0c\u800cparallel Scavenge\u6536\u96c6\u5668\u7684\u76ee\u6807\u5219\u662f\u8fbe\u5230\u4e00\u4e2a\u53ef\u63a7\u5236\u7684\u541e\u5410\u91cf\u3002\u541e\u5410\u91cf= \u7a0b\u5e8f\u8fd0\u884c\u65f6\u95f4\/(\u7a0b\u5e8f\u8fd0\u884c\u65f6\u95f4 + \u5783\u573e\u6536\u96c6\u65f6\u95f4)\uff0c\u865a\u62df\u673a\u603b\u5171\u8fd0\u884c\u4e86100\u5206\u949f\u3002\u5176\u4e2d\u5783\u573e\u6536\u96c6\u82b1\u63891\u5206\u949f\uff0c\u90a3\u541e\u5410\u91cf\u5c31\u662f99%\u3002<\/p>\n\n\n\n

        Parallel Scavenge\u63d0\u4f9b\u4e86\u4e24\u4e2a\u53c2\u6570\u7528\u6765\u7cbe\u786e\u63a7\u5236\uff0c\u5206\u522b\u662f\u63a7\u5236\u6700\u5927\u5783\u573e\u6536\u96c6\u505c\u987f\u65f6\u95f4\u7684-XX:MaxGCPauseMillis<\/code>\u53c2\u6570\u4ee5\u53ca\u76f4\u63a5\u8bbe\u7f6e\u541e\u5410\u91cf\u5927\u5c0f\u7684-XX:GCTimeRatio<\/code>\u53c2\u6570<\/p>\n\n\n\n

        MaxGCPauseMillis\u53c2\u6570\u5141\u8bb8\u7684\u503c\u662f\u4e00\u4e2a\u5927\u4e8e0\u7684\u6beb\u79d2\u6570\uff0c\u6536\u96c6\u5668\u5c06\u5c3d\u53ef\u80fd\u5730\u4fdd\u8bc1\u5185\u5b58\u56de\u6536\u82b1\u8d39\u7684\u65f6\u95f4\u4e0d\u8d85\u8fc7\u8bbe\u5b9a\u503c\u3002\u4e0d\u8fc7\u5927\u5bb6\u4e0d\u8981\u8ba4\u4e3a\u5982\u679c\u628a\u8fd9\u4e2a\u53c2\u6570\u7684\u503c\u8bbe\u7f6e\u5f97\u7a0d\u5c0f\u4e00\u70b9\u5c31\u80fd\u4f7f\u5f97\u7cfb\u7edf\u7684\u5783\u573e\u6536\u96c6\u901f\u5ea6\u53d8\u5f97\u66f4\u5feb\uff0cGC\u505c\u987f\u65f6\u95f4\u7f29\u77ed\u662f\u4ee5\u727a\u7272\u541e\u5410\u91cf\u548c\u65b0\u751f\u4ee3\u7a7a\u95f4\u6765\u6362\u53d6\u7684\uff1a\u7cfb\u7edf\u628a\u65b0\u751f\u4ee3\u8c03\u5c0f\u4e00\u4e9b\uff0c\u6536\u96c6300MB\u65b0\u751f\u4ee3\u80af\u5b9a\u6bd4\u6536\u96c6500MB\u5feb\u5427\uff0c\u8fd9\u4e5f\u76f4\u63a5\u5bfc\u81f4\u5783\u573e\u6536\u96c6\u53d1\u751f\u5f97\u66f4\u9891\u7e41\u4e00\u4e9b\uff0c\u539f\u676510\u79d2\u6536\u96c6\u4e00\u6b21\u3001\u6bcf\u6b21\u505c\u987f100\u6beb\u79d2\uff0c\u73b0\u5728\u53d8\u62105\u79d2\u6536\u96c6\u4e00\u6b21\u3001\u6bcf\u6b21\u505c\u987f70\u6beb\u79d2\u3002\u505c\u987f\u65f6\u95f4\u7684\u786e\u5728\u4e0b\u964d\uff0c\u4f46\u541e\u5410\u91cf\u4e5f\u964d\u4e0b\u6765\u4e86\u3002<\/p>\n\n\n\n

        GCTimeRatio\u53c2\u6570\u7684\u503c\u5e94\u5f53\u662f\u4e00\u4e2a\u5927\u4e8e0\u4e14\u5c0f\u4e8e100\u7684\u6574\u6570\uff0c\u4e5f\u5c31\u662f\u5783\u573e\u6536\u96c6\u65f6\u95f4\u5360\u603b\u65f6\u95f4\u7684\u6bd4\u7387\uff0c\u76f8\u5f53\u4e8e\u662f\u541e\u5410\u91cf\u7684\u5012\u6570\u3002\u5982\u679c\u628a\u6b64\u53c2\u6570\u8bbe\u7f6e\u4e3a19\uff0c\u90a3\u5141\u8bb8\u7684\u6700\u5927GC\u65f6\u95f4\u5c31\u5360\u603b\u65f6\u95f4\u76845%\uff08\u53731 \/\uff081+19\uff09\uff09\uff0c\u9ed8\u8ba4\u503c\u4e3a99\uff0c\u5c31\u662f\u5141\u8bb8\u6700\u59271%\uff08\u53731 \/\uff081+99\uff09\uff09\u7684\u5783\u573e\u6536\u96c6\u65f6\u95f4<\/p>\n\n\n\n

        Parallel Scavenge\u6536\u96c6\u5668\u4e5f\u7ecf\u5e38\u79f0\u4e3a\u201c\u541e\u5410\u91cf\u4f18\u5148\u201d\u6536\u96c6\u5668\u3002\u9664\u4e0a\u8ff0\u4e24\u4e2a\u53c2\u6570\u4e4b\u5916\uff0cParallel Scavenge\u6536\u96c6\u5668\u8fd8\u6709\u4e00\u4e2a\u53c2\u6570-XX:+UseAdaptiveSizePolicy<\/code>\u503c\u5f97\u5173\u6ce8\u3002\u8fd9\u662f\u4e00\u4e2a\u5f00\u5173\u53c2\u6570\uff0c\u5f53\u8fd9\u4e2a\u53c2\u6570\u6253\u5f00\u4e4b\u540e\uff0c\u5c31\u4e0d\u9700\u8981\u624b\u5de5\u6307\u5b9a\u65b0\u751f\u4ee3\u7684\u5927\u5c0f\uff08-Xmn\uff09\u3001Eden\u4e0eSurvivor\u533a\u7684\u6bd4\u4f8b\uff08-XX:SurvivorRatio\uff09\u3001\u664b\u5347\u8001\u5e74\u4ee3\u5bf9\u8c61\u5e74\u9f84\uff08-XX:PretenureSizeThreshold\uff09<\/code>\u7b49\u7ec6\u8282\u53c2\u6570\u4e86\uff0c\u865a\u62df\u673a\u4f1a\u6839\u636e\u5f53\u524d\u7cfb\u7edf\u7684\u8fd0\u884c\u60c5\u51b5\u6536\u96c6\u6027\u80fd\u76d1\u63a7\u4fe1\u606f\uff0c\u52a8\u6001\u8c03\u6574\u8fd9\u4e9b\u53c2\u6570\u4ee5\u63d0\u4f9b\u6700\u5408\u9002\u7684\u505c\u987f\u65f6\u95f4\u6216\u8005\u6700\u5927\u7684\u541e\u5410\u91cf\uff0c\u8fd9\u79cd\u8c03\u8282\u65b9\u5f0f\u79f0\u4e3aGC\u81ea\u9002\u5e94\u7684\u8c03\u8282\u7b56\u7565\uff08GC Ergonomics\uff09<\/p>\n\n\n\n

        1.4 Serial Old\u6536\u96c6\u5668<\/h4>\n\n\n\n

        Serial Old\u662fSerial\u6536\u96c6\u5668\u7684\u8001\u5e74\u4ee3\u7248\u672c\uff0c\u5b83\u540c\u6837\u662f\u4e00\u4e2a\u5355\u7ebf\u7a0b\u6536\u96c6\u5668\uff0c\u4f7f\u7528\u201c\u6807\u8bb0\uff0d\u6574\u7406\u201d\u7b97\u6cd5\u3002\u8fd9\u4e2a\u6536\u96c6\u5668\u7684\u4e3b\u8981\u610f\u4e49\u4e5f\u662f\u5728\u4e8e\u7ed9Client\u6a21\u5f0f\u4e0b\u7684\u865a\u62df\u673a\u4f7f\u7528\u3002\u5982\u679c\u5728Server\u6a21\u5f0f\u4e0b\uff0c\u90a3\u4e48\u5b83\u4e3b\u8981\u8fd8\u6709\u4e24\u5927\u7528\u9014\uff1a\u4e00\u79cd\u7528\u9014\u662f\u5728JDK 1.5\u4ee5\u53ca\u4e4b\u524d\u7684\u7248\u672c\u4e2d\u4e0eParallel Scavenge\u6536\u96c6\u5668\u642d\u914d\u4f7f\u7528\uff0c\u53e6\u4e00\u79cd\u7528\u9014\u5c31\u662f\u4f5c\u4e3aCMS\u6536\u96c6\u5668\u7684\u540e\u5907\u9884\u6848\uff0c\u5728\u5e76\u53d1\u6536\u96c6\u53d1\u751fConcurrent Mode Failure\u65f6\u4f7f\u7528\u3002\u8fd9\u4e24\u70b9\u90fd\u5c06\u5728\u540e\u9762\u7684\u5185\u5bb9\u4e2d\u8be6\u7ec6\u8bb2\u89e3\u3002<\/p>\n\n\n\n

        1.5 Parallel Old \u6536\u96c6\u5668<\/h4>\n\n\n\n

        Parallel Old\u662fParallel Scavenge\u6536\u96c6\u5668\u7684\u8001\u5e74\u4ee3\u7248\u672c\uff0c\u4f7f\u7528\u591a\u7ebf\u7a0b\u548c\u201c\u6807\u8bb0\uff0d\u6574\u7406\u201d\u7b97\u6cd5\u3002\u8fd9\u4e2a\u6536\u96c6\u5668\u662f\u5728JDK 1.6\u4e2d\u624d\u5f00\u59cb\u63d0\u4f9b\u7684\uff0c\u5728\u6b64\u4e4b\u524d\uff0c\u65b0\u751f\u4ee3\u7684Parallel Scavenge\u6536\u96c6\u5668\u4e00\u76f4\u5904\u4e8e\u6bd4\u8f83\u5c34\u5c2c\u7684\u72b6\u6001\u3002\u539f\u56e0\u662f\uff0c\u5982\u679c\u65b0\u751f\u4ee3\u9009\u62e9\u4e86Parallel Scavenge\u6536\u96c6\u5668\uff0c\u8001\u5e74\u4ee3\u9664\u4e86Serial Old\uff08PS MarkSweep\uff09\u6536\u96c6\u5668\u5916\u522b\u65e0\u9009\u62e9\uff08\u8fd8\u8bb0\u5f97\u4e0a\u9762\u8bf4\u8fc7Parallel Scavenge\u6536\u96c6\u5668\u65e0\u6cd5\u4e0eCMS\u6536\u96c6\u5668\u914d\u5408\u5de5\u4f5c\u5417\uff1f\uff09\u3002\u7531\u4e8e\u8001\u5e74\u4ee3Serial Old\u6536\u96c6\u5668\u5728\u670d\u52a1\u7aef\u5e94\u7528\u6027\u80fd\u4e0a\u7684\u201c\u62d6\u7d2f\u201d\uff0c\u4f7f\u7528\u4e86Parallel Scavenge\u6536\u96c6\u5668\u4e5f\u672a\u5fc5\u80fd\u5728\u6574\u4f53\u5e94\u7528\u4e0a\u83b7\u5f97\u541e\u5410\u91cf\u6700\u5927\u5316\u7684\u6548\u679c\uff0c\u7531\u4e8e\u5355\u7ebf\u7a0b\u7684\u8001\u5e74\u4ee3\u6536\u96c6\u4e2d\u65e0\u6cd5\u5145\u5206\u5229\u7528\u670d\u52a1\u5668\u591aCPU\u7684\u5904\u7406\u80fd\u529b\uff0c\u5728\u8001\u5e74\u4ee3\u5f88\u5927\u800c\u4e14\u786c\u4ef6\u6bd4\u8f83\u9ad8\u7ea7\u7684\u73af\u5883\u4e2d\uff0c\u8fd9\u79cd\u7ec4\u5408\u7684\u541e\u5410\u91cf\u751a\u81f3\u8fd8\u4e0d\u4e00\u5b9a\u6709ParNew\u52a0CMS\u7684\u7ec4\u5408\u201c\u7ed9\u529b\u201d\u3002<\/p>\n\n\n\n

        \u76f4\u5230Parallel Old\u6536\u96c6\u5668\u51fa\u73b0\u540e\uff0c\u201c\u541e\u5410\u91cf\u4f18\u5148\u201d\u6536\u96c6\u5668\u7ec8\u4e8e\u6709\u4e86\u6bd4\u8f83\u540d\u526f\u5176\u5b9e\u7684\u5e94\u7528\u7ec4\u5408\uff0c\u5728\u6ce8\u91cd\u541e\u5410\u91cf\u4ee5\u53caCPU\u8d44\u6e90\u654f\u611f\u7684\u573a\u5408\uff0c\u90fd\u53ef\u4ee5\u4f18\u5148\u8003\u8651Parallel Scavenge\u52a0Parallel Old\u6536\u96c6\u5668\u3002<\/p>\n\n\n\n

        1.5CMS \u6536\u96c6\u5668<\/h4>\n\n\n\n

        CMS\uff08Concurrent Mark Sweep\uff09\u6536\u96c6\u5668\u662f\u4e00\u79cd\u4ee5\u83b7\u53d6\u6700\u77ed\u56de\u6536\u505c\u987f\u65f6\u95f4\u4e3a\u76ee\u6807\u7684\u6536\u96c6\u5668\u3002\u76ee\u524d\u5f88\u5927\u4e00\u90e8\u5206\u7684Java\u5e94\u7528\u96c6\u4e2d\u5728\u4e92\u8054\u7f51\u7ad9\u6216\u8005B\/S\u7cfb\u7edf\u7684\u670d\u52a1\u7aef\u4e0a\uff0c\u8fd9\u7c7b\u5e94\u7528\u5c24\u5176\u91cd\u89c6\u670d\u52a1\u7684\u54cd\u5e94\u901f\u5ea6\uff0c\u5e0c\u671b\u7cfb\u7edf\u505c\u987f\u65f6\u95f4\u6700\u77ed\uff0c\u4ee5\u7ed9\u7528\u6237\u5e26\u6765\u8f83\u597d\u7684\u4f53\u9a8c\u3002CMS\u6536\u96c6\u5668\u5c31\u975e\u5e38\u7b26\u5408\u8fd9\u7c7b\u5e94\u7528\u7684\u9700\u6c42\u3002<\/p>\n\n\n\n

        \u4ece\u540d\u5b57\uff08\u5305\u542b\u201cMark Sweep\u201d\uff09\u4e0a\u5c31\u53ef\u4ee5\u770b\u51fa\uff0cCMS\u6536\u96c6\u5668\u662f\u57fa\u4e8e\u201c\u6807\u8bb0\u2014\u6e05\u9664\u201d\u7b97\u6cd5\u5b9e\u73b0\u7684\uff0c\u5b83\u7684\u8fd0\u4f5c\u8fc7\u7a0b\u76f8\u5bf9\u4e8e\u524d\u9762\u51e0\u79cd\u6536\u96c6\u5668\u6765\u8bf4\u66f4\u590d\u6742\u4e00\u4e9b\uff0c\u6574\u4e2a\u8fc7\u7a0b\u5206\u4e3a4\u4e2a\u6b65\u9aa4\uff0c\u5305\u62ec\uff1a<\/p>\n\n\n\n

        1. \u521d\u59cb\u6807\u8bb0\uff08CMS initial mark\uff09<\/li>
        2. \u5e76\u53d1\u6807\u8bb0\uff08CMS concurrent mark\uff09<\/li>
        3. \u91cd\u65b0\u6807\u8bb0\uff08CMS remark\uff09<\/li>
        4. \u5e76\u53d1\u6e05\u9664\uff08CMS concurrent sweep\uff09<\/li><\/ol>\n\n\n\n

          \u5176\u4e2d\uff0c\u521d\u59cb\u6807\u8bb0\u3001\u91cd\u65b0\u6807\u8bb0\u8fd9\u4e24\u4e2a\u6b65\u9aa4\u4ecd\u7136\u9700\u8981\u201cStop The World\u201d\u3002\u521d\u59cb\u6807\u8bb0\u4ec5\u4ec5\u53ea\u662f\u6807\u8bb0\u4e00\u4e0bGC Roots\u80fd\u76f4\u63a5\u5173\u8054\u5230\u7684\u5bf9\u8c61\uff0c\u901f\u5ea6\u5f88\u5feb\uff0c\u5e76\u53d1\u6807\u8bb0\u9636\u6bb5\u5c31\u662f\u8fdb\u884cGC Roots Tracing\u7684\u8fc7\u7a0b\uff0c\u800c\u91cd\u65b0\u6807\u8bb0\u9636\u6bb5\u5219\u662f\u4e3a\u4e86\u4fee\u6b63\u5e76\u53d1\u6807\u8bb0\u671f\u95f4\u56e0\u7528\u6237\u7a0b\u5e8f\u7ee7\u7eed\u8fd0\u4f5c\u800c\u5bfc\u81f4\u6807\u8bb0\u4ea7\u751f\u53d8\u52a8\u7684\u90a3\u4e00\u90e8\u5206\u5bf9\u8c61\u7684\u6807\u8bb0\u8bb0\u5f55\uff0c\u8fd9\u4e2a\u9636\u6bb5\u7684\u505c\u987f\u65f6\u95f4\u4e00\u822c\u4f1a\u6bd4\u521d\u59cb\u6807\u8bb0\u9636\u6bb5\u7a0d\u957f\u4e00\u4e9b\uff0c\u4f46\u8fdc\u6bd4\u5e76\u53d1\u6807\u8bb0\u7684\u65f6\u95f4\u77ed\u3002<\/p>\n\n\n\n

          CMS\u6536\u96c6\u5668\u65e0\u6cd5\u5904\u7406\u6d6e\u52a8\u5783\u573e\uff08Floating Garbage\uff09\uff0c\u53ef\u80fd\u51fa\u73b0\u201cConcurrent Mode Failure\u201d<\/code>\u5931\u8d25\u800c\u5bfc\u81f4\u53e6\u4e00\u6b21Full GC\u7684\u4ea7\u751f\u3002\u7531\u4e8eCMS\u5e76\u53d1\u6e05\u7406\u9636\u6bb5\u7528\u6237\u7ebf\u7a0b\u8fd8\u5728\u8fd0\u884c\u7740\uff0c\u4f34\u968f\u7a0b\u5e8f\u8fd0\u884c\u81ea\u7136\u5c31\u8fd8\u4f1a\u6709\u65b0\u7684\u5783\u573e\u4e0d\u65ad\u4ea7\u751f\uff0c\u8fd9\u4e00\u90e8\u5206\u5783\u573e\u51fa\u73b0\u5728\u6807\u8bb0\u8fc7\u7a0b\u4e4b\u540e\uff0cCMS\u65e0\u6cd5\u5728\u5f53\u6b21\u6536\u96c6\u4e2d\u5904\u7406\u6389\u5b83\u4eec\uff0c\u53ea\u597d\u7559\u5f85\u4e0b\u4e00\u6b21GC\u65f6\u518d\u6e05\u7406\u6389\u3002\u8fd9\u4e00\u90e8\u5206\u5783\u573e\u5c31\u79f0\u4e3a\u201c\u6d6e\u52a8\u5783\u573e\u201d\u3002\u4e5f\u662f\u7531\u4e8e\u5728\u5783\u573e\u6536\u96c6\u9636\u6bb5\u7528\u6237\u7ebf\u7a0b\u8fd8\u9700\u8981\u8fd0\u884c\uff0c\u90a3\u4e5f\u5c31\u8fd8\u9700\u8981\u9884\u7559\u6709\u8db3\u591f\u7684\u5185\u5b58\u7a7a\u95f4\u7ed9\u7528\u6237\u7ebf\u7a0b\u4f7f\u7528\uff0c\u56e0\u6b64CMS\u6536\u96c6\u5668\u4e0d\u80fd\u50cf\u5176\u4ed6\u6536\u96c6\u5668\u90a3\u6837\u7b49\u5230\u8001\u5e74\u4ee3\u51e0\u4e4e\u5b8c\u5168\u88ab\u586b\u6ee1\u4e86\u518d\u8fdb\u884c\u6536\u96c6\uff0c\u9700\u8981\u9884\u7559\u4e00\u90e8\u5206\u7a7a\u95f4\u63d0\u4f9b\u5e76\u53d1\u6536\u96c6\u65f6\u7684\u7a0b\u5e8f\u8fd0\u4f5c\u4f7f\u7528\u3002\u5728JDK 1.5\u7684\u9ed8\u8ba4\u8bbe\u7f6e\u4e0b\uff0cCMS\u6536\u96c6\u5668\u5f53\u8001\u5e74\u4ee3\u4f7f\u7528\u4e8668%\u7684\u7a7a\u95f4\u540e\u5c31\u4f1a\u88ab\u6fc0\u6d3b\uff0c\u8fd9\u662f\u4e00\u4e2a\u504f\u4fdd\u5b88\u7684\u8bbe\u7f6e\uff0c\u5982\u679c\u5728\u5e94\u7528\u4e2d\u8001\u5e74\u4ee3\u589e\u957f\u4e0d\u662f\u592a\u5feb\uff0c\u53ef\u4ee5\u9002\u5f53\u8c03\u9ad8\u53c2\u6570-XX:CMSInitiatingOccupancyFraction<\/code>\u7684\u503c\u6765\u63d0\u9ad8\u89e6\u53d1\u767e\u5206\u6bd4\uff0c\u4ee5\u4fbf\u964d\u4f4e\u5185\u5b58\u56de\u6536\u6b21\u6570\u4ece\u800c\u83b7\u53d6\u66f4\u597d\u7684\u6027\u80fd\uff0c\u5728JDK 1.6\u4e2d\uff0cCMS\u6536\u96c6\u5668\u7684\u542f\u52a8\u9608\u503c\u5df2\u7ecf\u63d0\u5347\u81f392%\u3002\u8981\u662fCMS\u8fd0\u884c\u671f\u95f4\u9884\u7559\u7684\u5185\u5b58\u65e0\u6cd5\u6ee1\u8db3\u7a0b\u5e8f\u9700\u8981\uff0c\u5c31\u4f1a\u51fa\u73b0\u4e00\u6b21\u201cConcurrent Mode Failure\u201d<\/code>\u5931\u8d25\uff0c\u8fd9\u65f6\u865a\u62df\u673a\u5c06\u542f\u52a8\u540e\u5907\u9884\u6848\uff1a\u4e34\u65f6\u542f\u7528Serial Old\u6536\u96c6\u5668\u6765\u91cd\u65b0\u8fdb\u884c\u8001\u5e74\u4ee3\u7684\u5783\u573e\u6536\u96c6\uff0c\u8fd9\u6837\u505c\u987f\u65f6\u95f4\u5c31\u5f88\u957f\u4e86\u3002\u6240\u4ee5\u8bf4\u53c2\u6570-XX:CMSInitiatingOccupancyFraction<\/code>\u8bbe\u7f6e\u5f97\u592a\u9ad8\u5f88\u5bb9\u6613\u5bfc\u81f4\u5927\u91cf\u201cConcurrent Mode Failure\u201d\u5931\u8d25\uff0c\u6027\u80fd\u53cd\u800c\u964d\u4f4e\u3002<\/p>\n\n\n\n

          CMS\u662f\u4e00\u6b3e\u57fa\u4e8e\u201c\u6807\u8bb0\u2014\u6e05\u9664\u201d\u7b97\u6cd5\u5b9e\u73b0\u7684\u6536\u96c6\u5668\uff0c\u5982\u679c\u8bfb\u8005\u5bf9\u524d\u9762\u8fd9\u79cd\u7b97\u6cd5\u4ecb\u7ecd\u8fd8\u6709\u5370\u8c61\u7684\u8bdd\uff0c\u5c31\u53ef\u80fd\u60f3\u5230\u8fd9\u610f\u5473\u7740\u6536\u96c6\u7ed3\u675f\u65f6\u4f1a\u6709\u5927\u91cf\u7a7a\u95f4\u788e\u7247\u4ea7\u751f\u3002\u7a7a\u95f4\u788e\u7247\u8fc7\u591a\u65f6\uff0c\u5c06\u4f1a\u7ed9\u5927\u5bf9\u8c61\u5206\u914d\u5e26\u6765\u5f88\u5927\u9ebb\u70e6\uff0c\u5f80\u5f80\u4f1a\u51fa\u73b0\u8001\u5e74\u4ee3\u8fd8\u6709\u5f88\u5927\u7a7a\u95f4\u5269\u4f59\uff0c\u4f46\u662f\u65e0\u6cd5\u627e\u5230\u8db3\u591f\u5927\u7684\u8fde\u7eed\u7a7a\u95f4\u6765\u5206\u914d\u5f53\u524d\u5bf9\u8c61\uff0c\u4e0d\u5f97\u4e0d\u63d0\u524d\u89e6\u53d1\u4e00\u6b21Full GC\u3002\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0cCMS\u6536\u96c6\u5668\u63d0\u4f9b\u4e86\u4e00\u4e2a-XX:+UseCMSCompactAtFullCollection<\/code>\u5f00\u5173\u53c2\u6570\uff08\u9ed8\u8ba4\u5c31\u662f\u5f00\u542f\u7684\uff09\uff0c\u7528\u4e8e\u5728CMS\u6536\u96c6\u5668\u9876\u4e0d\u4f4f\u8981\u8fdb\u884cFullGC\u65f6\u5f00\u542f\u5185\u5b58\u788e\u7247\u7684\u5408\u5e76\u6574\u7406\u8fc7\u7a0b\uff0c\u5185\u5b58\u6574\u7406\u7684\u8fc7\u7a0b\u662f\u65e0\u6cd5\u5e76\u53d1\u7684\uff0c\u7a7a\u95f4\u788e\u7247\u95ee\u9898\u6ca1\u6709\u4e86\uff0c\u4f46\u505c\u987f\u65f6\u95f4\u4e0d\u5f97\u4e0d\u53d8\u957f\u3002\u865a\u62df\u673a\u8bbe\u8ba1\u8005\u8fd8\u63d0\u4f9b\u4e86\u53e6\u5916\u4e00\u4e2a\u53c2\u6570-XX:CMSFullGCsBeforeCompaction<\/code>\uff0c\u8fd9\u4e2a\u53c2\u6570\u662f\u7528\u4e8e\u8bbe\u7f6e\u6267\u884c\u591a\u5c11\u6b21\u4e0d\u538b\u7f29\u7684Full GC\u540e\uff0c\u8ddf\u7740\u6765\u4e00\u6b21\u5e26\u538b\u7f29\u7684\uff08\u9ed8\u8ba4\u503c\u4e3a0\uff0c\u8868\u793a\u6bcf\u6b21\u8fdb\u5165Full GC\u65f6\u90fd\u8fdb\u884c\u788e\u7247\u6574\u7406\uff09\u3002<\/p>\n\n\n\n

          1.6 G1\u6536\u96c6\u5668<\/h4>\n\n\n\n

          G1\u662f\u4e00\u6b3e\u9762\u5411\u670d\u52a1\u7aef\u5e94\u7528\u7684\u5783\u573e\u6536\u96c6\u5668\u3002HotSpot\u5f00\u53d1\u56e2\u961f\u8d4b\u4e88\u5b83\u7684\u4f7f\u547d\u662f\uff08\u5728\u6bd4\u8f83\u957f\u671f\u7684\uff09\u672a\u6765\u53ef\u4ee5\u66ff\u6362\u6389JDK 1.5\u4e2d\u53d1\u5e03\u7684CMS\u6536\u96c6\u5668\u3002\u4e0e\u5176\u4ed6GC\u6536\u96c6\u5668\u76f8\u6bd4\uff0cG1\u5177\u5907\u5982\u4e0b\u7279\u70b9\u3002<\/p>\n\n\n\n

          \u5e76\u884c\u4e0e\u5e76\u53d1\uff1aG1\u80fd\u5145\u5206\u5229\u7528\u591aCPU\u3001\u591a\u6838\u73af\u5883\u4e0b\u7684\u786c\u4ef6\u4f18\u52bf\uff0c\u4f7f\u7528\u591a\u4e2aCPU\uff08CPU\u6216\u8005CPU\u6838\u5fc3\uff09\u6765\u7f29\u77edStop-The-World\u505c\u987f\u7684\u65f6\u95f4\uff0c\u90e8\u5206\u5176\u4ed6\u6536\u96c6\u5668\u539f\u672c\u9700\u8981\u505c\u987fJava\u7ebf\u7a0b\u6267\u884c\u7684GC\u52a8\u4f5c\uff0cG1\u6536\u96c6\u5668\u4ecd\u7136\u53ef\u4ee5\u901a\u8fc7\u5e76\u53d1\u7684\u65b9\u5f0f\u8ba9Java\u7a0b\u5e8f\u7ee7\u7eed\u6267\u884c\u3002<\/p>\n\n\n\n

          \u5206\u4ee3\u6536\u96c6\uff1a\u4e0e\u5176\u4ed6\u6536\u96c6\u5668\u4e00\u6837\uff0c\u5206\u4ee3\u6982\u5ff5\u5728G1\u4e2d\u4f9d\u7136\u5f97\u4ee5\u4fdd\u7559\u3002\u867d\u7136G1\u53ef\u4ee5\u4e0d\u9700\u8981\u5176\u4ed6\u6536\u96c6\u5668\u914d\u5408\u5c31\u80fd\u72ec\u7acb\u7ba1\u7406\u6574\u4e2aGC\u5806\uff0c\u4f46\u5b83\u80fd\u591f\u91c7\u7528\u4e0d\u540c\u7684\u65b9\u5f0f\u53bb\u5904\u7406\u65b0\u521b\u5efa\u7684\u5bf9\u8c61\u548c\u5df2\u7ecf\u5b58\u6d3b\u4e86\u4e00\u6bb5\u65f6\u95f4\u3001\u71ac\u8fc7\u591a\u6b21GC\u7684\u65e7\u5bf9\u8c61\u4ee5\u83b7\u53d6\u66f4\u597d\u7684\u6536\u96c6\u6548\u679c\u3002<\/p>\n\n\n\n

          \u7a7a\u95f4\u6574\u5408\uff1a\u4e0eCMS\u7684\u201c\u6807\u8bb0\u2014\u6e05\u7406\u201d\u7b97\u6cd5\u4e0d\u540c\uff0cG1\u4ece\u6574\u4f53\u6765\u770b\u662f\u57fa\u4e8e\u201c\u6807\u8bb0\u2014\u6574\u7406\u201d\u7b97\u6cd5\u5b9e\u73b0\u7684\u6536\u96c6\u5668\uff0c\u4ece\u5c40\u90e8\uff08\u4e24\u4e2aRegion\u4e4b\u95f4\uff09\u4e0a\u6765\u770b\u662f\u57fa\u4e8e\u201c\u590d\u5236\u201d\u7b97\u6cd5\u5b9e\u73b0\u7684\uff0c\u4f46\u65e0\u8bba\u5982\u4f55\uff0c\u8fd9\u4e24\u79cd\u7b97\u6cd5\u90fd\u610f\u5473\u7740G1\u8fd0\u4f5c\u671f\u95f4\u4e0d\u4f1a\u4ea7\u751f\u5185\u5b58\u7a7a\u95f4\u788e\u7247\uff0c\u6536\u96c6\u540e\u80fd\u63d0\u4f9b\u89c4\u6574\u7684\u53ef\u7528\u5185\u5b58\u3002\u8fd9\u79cd\u7279\u6027\u6709\u5229\u4e8e\u7a0b\u5e8f\u957f\u65f6\u95f4\u8fd0\u884c\uff0c\u5206\u914d\u5927\u5bf9\u8c61\u65f6\u4e0d\u4f1a\u56e0\u4e3a\u65e0\u6cd5\u627e\u5230\u8fde\u7eed\u5185\u5b58\u7a7a\u95f4\u800c\u63d0\u524d\u89e6\u53d1\u4e0b\u4e00\u6b21GC\u3002<\/p>\n\n\n\n

          \u53ef\u9884\u6d4b\u7684\u505c\u987f\uff1a\u8fd9\u662fG1\u76f8\u5bf9\u4e8eCMS\u7684\u53e6\u4e00\u5927\u4f18\u52bf\uff0c\u964d\u4f4e\u505c\u987f\u65f6\u95f4\u662fG1\u548cCMS\u5171\u540c\u7684\u5173\u6ce8\u70b9\uff0c\u4f46G1\u9664\u4e86\u8ffd\u6c42\u4f4e\u505c\u987f\u5916\uff0c\u8fd8\u80fd\u5efa\u7acb\u53ef\u9884\u6d4b\u7684\u505c\u987f\u65f6\u95f4\u6a21\u578b\uff0c\u80fd\u8ba9\u4f7f\u7528\u8005\u660e\u786e\u6307\u5b9a\u5728\u4e00\u4e2a\u957f\u5ea6\u4e3aM\u6beb\u79d2\u7684\u65f6\u95f4\u7247\u6bb5\u5185\uff0c\u6d88\u8017\u5728\u5783\u573e\u6536\u96c6\u4e0a\u7684\u65f6\u95f4\u4e0d\u5f97\u8d85\u8fc7N\u6beb\u79d2\uff0c\u8fd9\u51e0\u4e4e\u5df2\u7ecf\u662f\u5b9e\u65f6Java\uff08RTSJ\uff09\u7684\u5783\u573e\u6536\u96c6\u5668\u7684\u7279\u5f81\u4e86\u3002<\/p>\n\n\n\n

          \u5728G1\u4e4b\u524d\u7684\u5176\u4ed6\u6536\u96c6\u5668\u8fdb\u884c\u6536\u96c6\u7684\u8303\u56f4\u90fd\u662f\u6574\u4e2a\u65b0\u751f\u4ee3\u6216\u8005\u8001\u5e74\u4ee3\uff0c\u800cG1\u4e0d\u518d\u662f\u8fd9\u6837\u3002\u4f7f\u7528G1\u6536\u96c6\u5668\u65f6\uff0cJava\u5806\u7684\u5185\u5b58\u5e03\u5c40\u5c31\u4e0e\u5176\u4ed6\u6536\u96c6\u5668\u6709\u5f88\u5927\u5dee\u522b\uff0c\u5b83\u5c06\u6574\u4e2aJava\u5806\u5212\u5206\u4e3a\u591a\u4e2a\u5927\u5c0f\u76f8\u7b49\u7684\u72ec\u7acb\u533a\u57df\uff08Region\uff09\uff0c\u867d\u7136\u8fd8\u4fdd\u7559\u6709\u65b0\u751f\u4ee3\u548c\u8001\u5e74\u4ee3\u7684\u6982\u5ff5\uff0c\u4f46\u65b0\u751f\u4ee3\u548c\u8001\u5e74\u4ee3\u4e0d\u518d\u662f\u7269\u7406\u9694\u79bb\u7684\u4e86\uff0c\u5b83\u4eec\u90fd\u662f\u4e00\u90e8\u5206Region\uff08\u4e0d\u9700\u8981\u8fde\u7eed\uff09\u7684\u96c6\u5408\u3002<\/p>\n\n\n\n

          2 \u603b\u7ed3<\/h3>\n\n\n\n

          \u5404\u4e2a\u6536\u96c6\u5668\u90fd\u6709\u81ea\u5df1\u9002\u5e94\u7684\u4e1a\u52a1\u573a\u666f\uff0c\u4e00\u822c\u6765\u8bf4\u5728\u751f\u4ea7\u4e2d\u90fd\u4f1a\u4f7f\u7528ParNew\uff0bCMS<\/code>\u7684\u65b9\u5f0f\u5206\u4ee3\u6536\u96c6\u56de\u6536\u3002\u9488\u5bf9\u4e8e\u65b0\u751f\u4ee3\u6765\u8bf4\uff0c\u6839\u636e\u5176\u7279\u6027\uff0c\u603b\u7684\u6765\u8bf4\u8fd8\u662f\u4f7f\u7528\u590d\u5236\u7b97\u6cd5\u3002\u800c\u9488\u5bf9\u4e8e\u8001\u5e74\u4ee3\u6765\u8bf4\u7b97\u6cd5\u4e00\u822c\u4f1a\u4f7f\u7528\u4e24\u79cd\uff0c\u6807\u8bb0\uff0d\u6e05\u9664\u548c\u6807\u8bb0\uff0d\u6574\u7406\uff0c\u6bcf\u4e00\u79cd\u90fd\u6709\u81ea\u5df1\u9002\u7528\u7684\u573a\u666f\u3002\u4f46\u662f\u5728\u76ee\u524d\u6211\u9047\u5230\u7684\u751f\u4ea7\u4e2d\u8fd8\u662f\u4f7f\u7528CMS \u6807\u8bb0\u6e05\u9664\u7684\u8fd9\u79cd\u6bd4\u8f83\u591a\uff0c\u4e5f\u662f\u6bd4\u8f83\u5e38\u7528\u7684\uff0c\u867d\u7136\u6807\u8bb0\uff0d\u6e05\u9664\u8fd9\u79cd\u7b97\u6cd5\u4f1a\u5bfc\u81f4\u5927\u91cf\u7684\u5185\u5b58\u788e\u7247\uff0c\u4f46\u662f\u4e5f\u662f\u53ef\u4ee5\u901a\u8fc7\u4e00\u79cd\u66b4\u529b\u7684\u65b9\u5f0f\u89e3\u51b3\uff0c\u5c31\u662fFULL GC\uff0cG1\u6536\u96c6\u5668\u662f\u6bd4\u8f83\u5b8c\u7f8e\u7684\u4e00\u79cd\u6536\u96c6\u5668\uff0c\u4f46\u662f\u5728\u76ee\u524d\u7684\u751f\u4ea7\u4e2d\u4f9d\u65e7\u7528\u5f97\u5f88\u5c11\u3002+<\/p>\n","protected":false},"excerpt":{"rendered":"

          \u4e00\u3001java\u57fa\u7840\u77e5\u8bc6\u56de\u987e 1. \u5982\u4f55\u8ba1\u7b97\u5bf9\u8c61\u5df2\u6b7b 1.1 \u5f15\u7528\u8ba1\u6570\u5668\u7b97\u6cd5 \u5f15\u7528\u8ba1\u6570\u5668\u7b97\u6cd5\u662f\u7ed9\u6bcf\u4e2a\u5bf9\u8c61\u8bbe\u7f6e\u4e00\u4e2a\u8ba1 […]<\/p>\n","protected":false},"author":1,"featured_media":45,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10],"tags":[],"_links":{"self":[{"href":"https:\/\/blog.frost-s.com\/index.php\/wp-json\/wp\/v2\/posts\/199"}],"collection":[{"href":"https:\/\/blog.frost-s.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.frost-s.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.frost-s.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.frost-s.com\/index.php\/wp-json\/wp\/v2\/comments?post=199"}],"version-history":[{"count":5,"href":"https:\/\/blog.frost-s.com\/index.php\/wp-json\/wp\/v2\/posts\/199\/revisions"}],"predecessor-version":[{"id":987,"href":"https:\/\/blog.frost-s.com\/index.php\/wp-json\/wp\/v2\/posts\/199\/revisions\/987"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blog.frost-s.com\/index.php\/wp-json\/wp\/v2\/media\/45"}],"wp:attachment":[{"href":"https:\/\/blog.frost-s.com\/index.php\/wp-json\/wp\/v2\/media?parent=199"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.frost-s.com\/index.php\/wp-json\/wp\/v2\/categories?post=199"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.frost-s.com\/index.php\/wp-json\/wp\/v2\/tags?post=199"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}