{"id":39768,"date":"2025-05-25T22:08:37","date_gmt":"2025-05-25T14:08:37","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/39768.html"},"modified":"2025-05-25T22:08:37","modified_gmt":"2025-05-25T14:08:37","slug":"jvm-%e5%9e%83%e5%9c%be%e5%9b%9e%e6%94%b6","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/39768.html","title":{"rendered":"JVM\u2014\u2014\u5783\u573e\u56de\u6536"},"content":{"rendered":"<h3>\u89e6\u53d1\u5783\u573e\u56de\u6536\u7684\u65b9\u5f0f&#xff1a;<\/h3>\n<ul>\n<li>\u5185\u5b58\u4e0d\u8db3\u65f6&#xff1a;\u5806\u5185\u5b58\u4e0d\u8db3&#xff0c;\u65e0\u6cd5\u4e3a\u65b0\u5bf9\u8c61\u5206\u914d\u5185\u5b58\u65f6\u89e6\u53d1\u5783\u573e\u56de\u6536<\/li>\n<li>\u624b\u52a8\u8bf7\u6c42\u5efa\u8bae&#xff1a;\u8c03\u7528System.gc()\u6216Runtime.getRuntime.gc()\u5efa\u8bae\u5783\u573e\u56de\u6536&#xff0c;\u4e0d\u4fdd\u8bc1\u7acb\u5373\u6267\u884c<\/li>\n<li>\u8bbe\u7f6eJVM\u53c2\u6570&#xff1a;-Xmx&#xff08;\u6700\u5927\u5806\u5185\u5b58&#xff09;&#xff0c;-Xms&#xff08;\u521d\u59cb\u5806\u5185\u5b58&#xff09;&#xff0c;-Xmn&#xff08;\u65b0\u751f\u4ee3\u5185\u5b58&#xff09;<\/li>\n<li>\u81ea\u5b9a\u4e49\u9608\u503c&#xff1a;\u4e0d\u540c\u5783\u573e\u56de\u6536\u5668\u5185\u90e8\u5b9e\u73b0\u4e86\u4e0d\u540c\u7b56\u7565&#xff0c;\u8bbe\u7f6e\u5bf9\u5e94\u7684\u5bf9\u8c61\u6570\u91cf\u6216\u5185\u5b58\u7a7a\u95f4\u9608\u503c<\/li>\n<\/ul>\n<h3>\u5224\u65ad\u5bf9\u8c61\u662f\u5426\u4e3a\u5783\u573e\u7684\u65b9\u6cd5\u6709\u54ea\u4e9b&#xff1f;<\/h3>\n<h4>\u5f15\u7528\u8ba1\u6570\u6cd5:<\/h4>\n<ul>\n<li>\u539f\u7406&#xff1a;\u4e3a\u6bcf\u4e2a\u5bf9\u8c61\u5206\u914d\u4e00\u4e2a\u5f15\u7528\u8ba1\u6570\u5668&#xff0c;\u6bcf\u5f53\u6709\u4e00\u4e2a\u5730\u65b9\u5f15\u7528\u8be5\u5bf9\u8c61&#xff0c;\u8ba1\u6570\u5668\u52a01&#xff0c;\u6bcf\u5f53\u5f15\u7528\u53d8\u91cf\u88ab\u79fb\u9664\u6216\u6307\u5411\u5176\u4ed6\u5bf9\u8c61\u65f6&#xff0c;\u8ba1\u6570\u5668\u51cf1\u3002\u8ba1\u6570\u5668\u4e3a0\u65f6\u8868\u793a\u6ca1\u6709\u5f15\u7528&#xff0c;\u53ef\u4ee5\u88ab\u56de\u6536\u3002<\/li>\n<li>\u7f3a\u9677&#xff1a;\u4e0d\u80fd\u89e3\u51b3\u5faa\u73af\u5f15\u7528\u95ee\u9898&#xff0c;\u5373\u4e24\u4e2a\u5bf9\u8c61\u4e92\u76f8\u5f15\u7528\u6216\u5f15\u7528\u94fe\u6210\u73af&#xff0c;\u5373\u4f7f\u8fd9\u4e9b\u5bf9\u8c61\u4e0d\u88ab\u4f7f\u7528\u4e5f\u65e0\u6cd5\u88ab\u56de\u6536<\/li>\n<\/ul>\n<h4>\u53ef\u8fbe\u6027\u5206\u6790\u7b97\u6cd5&#xff1a;<\/h4>\n<p>\u539f\u7406&#xff1a;\u4ece\u4e00\u7ec4GC root&#xff08;\u5783\u573e\u6536\u96c6\u6839&#xff09;\u5bf9\u8c61\u51fa\u53d1&#xff0c;\u5411\u4e0b\u8ffd\u6eaf\u5f15\u7528\u94fe&#xff08;\u7c7b\u4f3c\u4e8e\u6df1\u5ea6\u641c\u7d22&#xff09;&#xff0c;\u82e5\u67d0\u4e2a\u5bf9\u8c61\u4e0d\u4e0e\u4efb\u4f55\u5f15\u7528\u94fe\u76f8\u8fde&#xff0c;\u90a3\u4e48\u5c31\u8ba4\u4e3a\u8fd9\u4e2a\u5bf9\u8c61\u662f\u4e0d\u53ef\u8fbe\u7684&#xff0c;\u53ef\u4ee5\u88ab\u56de\u6536\u3002<\/p>\n<h5>GC root\u5305\u542b&#xff1a;<\/h5>\n<ul>\n<li>\u865a\u62df\u673a\u6808&#xff08;\u6808\u5e27\u4e2d\u7684\u672c\u5730\u53d8\u91cf\u8868&#xff09;\u4e2d\u5f15\u7528\u7684\u5bf9\u8c61<\/li>\n<li>\u672c\u5730\u65b9\u6cd5\u6808\u4e2d\u5f15\u7528\u7684\u5bf9\u8c61<\/li>\n<li>\u65b9\u6cd5\u533a\u4e2d\u9759\u6001\u5c5e\u6027\u5bf9\u8c61\u548c\u5e38\u91cf\u5bf9\u8c61<\/li>\n<li>\u6301\u6709\u9501\u7684\u5bf9\u8c61<\/li>\n<\/ul>\n<h3>\u5783\u573e\u56de\u6536\u7b97\u6cd5\u6709\u54ea\u4e9b&#xff1f;<\/h3>\n<h4>\u6807\u8bb0\u2014\u6e05\u9664\u7b97\u6cd5&#xff1a;<\/h4>\n<ul>\n<li>\u539f\u7406&#xff1a;\u5229\u7528\u53ef\u8fbe\u6027\u5206\u6790\u6807\u8bb0\u51fa\u9700\u8981\u56de\u6536\u7684\u6240\u6709\u5bf9\u8c61&#xff0c;\u518d\u7edf\u4e00\u56de\u6536<\/li>\n<li>\u7f3a\u9677&#xff1a;\u6807\u8bb0\u548c\u6e05\u9664\u7684\u8fc7\u7a0b\u6548\u7387\u90fd\u4e0d\u9ad8&#xff0c;\u4e14\u6e05\u9664\u7ed3\u675f\u540e\u5bb9\u6613\u4ea7\u751f\u5927\u91cf\u788e\u7247\u5316\u7a7a\u95f4&#xff0c;\u4e0d\u5229\u4e8e\u7a7a\u95f4\u7684\u518d\u5229\u7528\u3002<\/li>\n<\/ul>\n<h4>\u590d\u5236\u7b97\u6cd5&#xff1a;<\/h4>\n<ul>\n<li>\u539f\u7406&#xff1a;\u5c06\u5185\u5b58\u5206\u4e3a\u4e24\u90e8\u5206&#xff08;from\u548cto\u533a\u57df&#xff09;&#xff0c;\u6bcf\u6b21\u7533\u8bf7\u5185\u5b58\u65f6\u4f7f\u7528\u5176\u4e2d\u4e00\u5757&#xff08;\u4f5c\u4e3afrom\u533a\u57df&#xff09;\u3002\u5728\u53ef\u8fbe\u6027\u5206\u6790\u7684\u8fc7\u7a0b\u4e2d\u5c06\u5b58\u6d3b\u5bf9\u8c61\u6309\u987a\u5e8f\u7d27\u51d1\u590d\u5236\u5230to\u533a\u57df&#xff08;\u7a7a\u95f2\u5185\u5b58\u5757&#xff09;\u4e2d\u3002\u6700\u540e\u6e05\u7406from\u548cEden\u533a\u57df\u3002<\/li>\n<li>\u7f3a\u9677&#xff1a;\u6bcf\u6b21\u53ea\u80fd\u4f7f\u7528\u4e00\u534a\u7684\u5185\u5b58&#xff0c;\u5185\u5b58\u5229\u7528\u7387\u4f4e\u3002\u65e0\u9700\u663e\u5f0f\u6e05\u9664\u5783\u573e\u5bf9\u8c61&#xff0c;\u5b58\u6d3b\u5bf9\u8c61\u8f83\u591a\u65f6\u7531\u4e8e\u590d\u5236\u8f83\u591a\u5bfc\u81f4\u6548\u7387\u8f83\u4f4e<\/li>\n<\/ul>\n<h4>\u6807\u8bb0\u2014\u6574\u7406&#xff08;\u538b\u7f29&#xff09;\u7b97\u6cd5&#xff1a;<\/h4>\n<ul>\n<li>\u539f\u7406&#xff1a;\u6807\u8bb0\u8fc7\u7a0b\u4e0e\u6807\u8bb0\u2014\u6e05\u9664\u7b97\u6cd5\u4e00\u81f4&#xff0c;\u4f46\u6807\u8bb0\u540e\u4e0d\u4f1a\u7acb\u5373\u6e05\u7406&#xff0c;\u800c\u662f\u5c06\u6240\u6709\u5b58\u6d3b\u5bf9\u8c61\u90fd\u79fb\u52a8\u5230\u5185\u5b58\u7684\u4e00\u7aef\u3002\u79fb\u52a8\u7ed3\u675f\u540e\u76f4\u63a5\u6e05\u7406\u5269\u4f59\u90e8\u5206\u3002<\/li>\n<\/ul>\n<h4>\u5206\u4ee3\u56de\u6536\u7b97\u6cd5&#xff1a;<\/h4>\n<ul>\n<li>\u5c06\u5185\u5b58\u5212\u5206\u4e3a\u65b0\u751f\u4ee3\u548c\u8001\u5e74\u4ee3\u3002\u5206\u914d\u4f9d\u636e\u662f\u5bf9\u8c61\u7684\u751f\u547d\u5468\u671f\u3002\u5bf9\u8c61\u521b\u5efa\u65f6\u4f1a\u5728\u65b0\u751f\u4ee3\u4e2d\u7533\u8bf7\u5185\u5b58&#xff0c;\u65b0\u751f\u4ee3\u7684\u6bcf\u6b21GC\u90fd\u4f1a\u4f7f\u5b58\u6d3b\u4e0b\u6765\u7684\u5bf9\u8c61\u5e74\u9f84&#043;1&#xff0c;\u5f53\u5e74\u9f84\u8d85\u8fc7\u9608\u503c&#xff08;\u9ed8\u8ba415&#xff09;\u65f6\u4f1a\u5c06\u5bf9\u8c61\u664b\u5347\u5230\u8001\u5e74\u4ee3\u4e2d\u3002&#xff08;\u82e5\u5e78\u5b58\u533a\u5185\u5b58\u8d85\u8fc7\u767e\u5206\u4e4b50\u4e5f\u4f1a\u76f4\u63a5\u5c06\u5e74\u9f84\u8f83\u5927\u7684\u5bf9\u8c61\u76f4\u63a5\u664b\u5347\u5230\u8001\u5e74\u4ee3\u4e2d&#xff0c;\u907f\u514d\u9891\u7e41GC&#xff09;<\/li>\n<\/ul>\n<h3>STW&#xff08;stop the world&#xff09;<\/h3>\n<p>STW\u4f1a\u6682\u505c\u6240\u6709\u7528\u6237\u7ebf\u7a0b&#xff08;\u5982\u4e1a\u52a1\u903b\u8f91\u3001IO\u64cd\u4f5c&#xff09;&#xff0c;\u4ee5\u786e\u4fddGC\u51c6\u786e\u8bc6\u522b\u5b58\u6d3b\u5bf9\u8c61\u4e0e\u5783\u573e\u3002<\/p>\n<p>\u5426\u5219\u53ef\u80fd\u5bfc\u81f4\u4ee5\u4e0b\u95ee\u9898&#xff1a;<\/p>\n<li>\u5f15\u7528\u5173\u7cfb\u53d8\u5316\u200b\n<ul>\n<li>\u4f8b\u5982&#xff1a;\u7ebf\u7a0b A \u6b63\u5728\u626b\u63cf\u5bf9\u8c61\u00a0X&#xff0c;\u800c\u7ebf\u7a0b B \u7a81\u7136\u4fee\u6539\u00a0X\u00a0\u7684\u5f15\u7528&#xff0c;\u5bfc\u81f4 GC \u8bef\u5224&#xff08;\u6f0f\u6807\u6216\u9519\u6807&#xff09;\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u200b\u5bf9\u8c61\u79fb\u52a8\u95ee\u9898\u200b\n<ul>\n<li>\u5982\u679c GC \u6b63\u5728\u538b\u7f29\u5806&#xff08;\u5982 Serial \/ Parallel GC \u7684\u6574\u7406\u9636\u6bb5&#xff09;&#xff0c;\u7528\u6237\u7ebf\u7a0b\u53ef\u80fd\u8bbf\u95ee\u5230\u5df2\u88ab\u79fb\u52a8\u7684\u65e7\u5730\u5740&#xff0c;\u5bfc\u81f4\u5185\u5b58\u8bbf\u95ee\u9519\u8bef\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u200b\u5e76\u53d1\u7ade\u4e89\u200b\n<ul>\n<li>\u7528\u6237\u7ebf\u7a0b\u548c GC \u7ebf\u7a0b\u540c\u65f6\u64cd\u4f5c\u5806\u5185\u5b58&#xff0c;\u53ef\u80fd\u5f15\u53d1\u6570\u636e\u7ade\u4e89&#xff08;Data Race&#xff09;&#xff0c;\u7834\u574f\u5806\u7684\u5b8c\u6574\u6027\u3002<\/li>\n<\/ul>\n<\/li>\n<h2>\u5783\u573e\u56de\u6536\u5668\u6709\u54ea\u4e9b&#xff1f;<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"958\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/05\/20250525140835-68332463d6c7f.png\" width=\"1986\" \/><\/p>\n<h5>\u54cd\u5e94\u901f\u5ea6\u4f18\u5148\u662f\u4ec0\u4e48&#xff1a;<\/h5>\n<p>\u5355\u6b21STW\u65f6\u95f4\u66f4\u77ed\u4f46\u66f4\u9891\u7e41\u6216\u5141\u8bb8\u7528\u6237\u7ebf\u7a0b\u548cGC\u7ebf\u7a0b\u5e76\u53d1&#xff0c;\u5bf9\u5ba2\u6237\u7aef\u4ea4\u4e92\u7684\u54cd\u5e94\u901f\u5ea6\u66f4\u5feb\u3002<\/p>\n<h5>\u541e\u5410\u91cf\u4f18\u5148\u662f\u4ec0\u4e48&#xff1a;<\/h5>\n<p>\u5355\u6b21STW\u65f6\u95f4\u66f4\u957f&#xff0c;\u4f46\u6b21\u6570\u5c11&#xff0c;\u9002\u5408\u8ba1\u7b97\u91cf\u5927\u4e14\u4ea4\u4e92\u4e0d\u591a\u7684\u573a\u666f\u3002<\/p>\n<h3>CMS\u56de\u6536\u5668\u8be6\u89e3&#xff1a;<\/h3>\n<p>\u8001\u5e74\u4ee3\u7684\u4e00\u79cd\u5e76\u53d1\u4f4e\u5ef6\u8fdf\u5783\u573e\u56de\u6536\u5668&#xff0c;\u65e8\u5728\u51cf\u5c11STW\u65f6\u95f4&#xff0c;\u9002\u7528\u4e8e\u54cd\u5e94\u65f6\u95f4\u654f\u611f\u7684\u670d\u52a1<\/p>\n<h4>\u6838\u5fc3\u7279\u70b9&#xff1a;<\/h4>\n<ul>\n<li>\u5e76\u53d1\u6807\u8bb0\u6e05\u7406&#xff1a;<\/li>\n<li>\u6807\u8bb0\u2014\u6e05\u9664\u7b97\u6cd5&#xff1a;<\/li>\n<li>\u5206\u4ee3\u56de\u6536&#xff1a;\u901a\u5e38\u4e0eparNew\u914d\u5408\u4f7f\u7528<\/li>\n<\/ul>\n<h4>\u5de5\u4f5c\u6d41\u7a0b&#xff1a;<\/h4>\n<h6>1\u3001\u521d\u59cb\u6807\u8bb0&#xff08;<span style=\"color:#fe2c24\">STW<\/span>&#xff09;&#xff1a;<\/h6>\n<ul>\n<li>\u5feb\u901f\u6807\u8bb0GC Roots\u5bf9\u8c61&#xff0c;STW\u65f6\u95f4\u6781\u77ed<\/li>\n<\/ul>\n<h6>2\u3001\u5e76\u53d1\u6807\u8bb0&#xff1a;<\/h6>\n<ul>\n<li>\u9012\u5f52\u904d\u5386\u5f15\u7528\u94fe&#xff0c;\u6807\u8bb0\u6240\u6709\u5b58\u6d3b\u5bf9\u8c61<\/li>\n<li>\u5e76\u53d1\u6267\u884c&#xff0c;\u4e0d\u963b\u585e\u7528\u6237\u7ebf\u7a0b<\/li>\n<li>\u7531\u4e8e\u7528\u6237\u7ebf\u7a0b\u53ef\u80fd\u4fee\u6539\u5f15\u7528&#xff0c;\u5bfc\u81f4\u201c\u6d6e\u52a8\u5783\u573e\u201d&#xff08;\u672c\u6b21GC\u65e0\u6cd5\u56de\u6536&#xff09;<\/li>\n<\/ul>\n<h6>3\u3001\u91cd\u65b0\u6807\u8bb0&#xff08;<span style=\"color:#fe2c24\">STW<\/span>&#xff09;&#xff1a;<\/h6>\n<ul>\n<li>\u4fee\u6b63\u5e76\u53d1\u65f6\u7528\u6237\u7ebf\u7a0b\u66f4\u6539\u7684\u5f15\u7528&#xff08;\u5173\u6ce8\u65b0\u589e\u5f15\u7528&#xff0c;\u9632\u6b62\u56de\u6536\u65b0\u7684\u5b58\u6d3b\u5bf9\u8c61&#xff0c;\u4f46\u65e0\u6cd5\u907f\u514d\u6d6e\u52a8\u5783\u573e&#xff09;<\/li>\n<li>\u6bd4\u521d\u59cb\u6807\u8bb0\u65f6\u95f4\u7a0d\u957f&#xff0c;\u4f46\u6bd4full GC\u77ed<\/li>\n<\/ul>\n<h6>4\u3001\u5e76\u53d1\u6e05\u9664&#xff1a;<\/h6>\n<ul>\n<li>\u6e05\u9664\u672a\u6807\u8bb0\u5bf9\u8c61&#xff0c;\u56de\u6536\u5185\u5b58&#xff0c;\u4f46\u4f1a\u4ea7\u751f\u788e\u7247\u5316\u5185\u5b58<\/li>\n<li>\u5e76\u53d1\u6267\u884c&#xff0c;\u4e0d\u963b\u585e\u7528\u6237\u7ebf\u7a0b<\/li>\n<\/ul>\n<h6>Full GC&#xff08;\u5931\u8d25\u9000\u5316&#xff09;<\/h6>\n<ul>\n<li>\u957f\u671f\u788e\u7247\u5316\u5185\u5b58\u5806\u79ef\u53ef\u80fd\u5bfc\u81f4\u664b\u5347\u5931\u8d25&#xff0c;\u9000\u5316\u4e3aSerial Old GC&#xff08;\u5355\u7ebf\u7a0b\u6807\u8bb0\u2014\u6574\u7406&#xff09;&#xff0c;\u5927\u5e45\u589e\u52a0STW\u65f6\u95f4<\/li>\n<\/ul>\n<h3>G1\u56de\u6536\u5668\u8be6\u89e3&#xff1a;<\/h3>\n<h4>\u72ec\u7279\u52a8\u6001\u5185\u5b58\u6a21\u578b&#xff1a;<\/h4>\n<p>\u4e0d\u518d\u7269\u7406\u4e25\u683c\u5212\u5206\u4ee3&#xff0c;\u800c\u662f\u903b\u8f91\u4fdd\u7559\u4ee3\u7684\u6982\u5ff5&#xff0c;\u901a\u8fc7Region&#xff08;\u533a\u57df&#xff09;\u52a8\u6001\u586b\u5145<\/p>\n<p>G1\u5c06\u5806\u5212\u5206\u4e3a\u591a\u4e2a\u56fa\u5b9a\u5927\u5c0f\u7684Region&#xff08;1mb~32mb&#xff0c;\u53ef\u901a\u8fc7-XX&#xff1a;GHeapRegionSize\u8c03\u6574&#xff09;&#xff0c;\u5e76\u52a8\u6001\u5206\u914d\u7ed9\u4e0d\u540c\u4ee3&#xff1a;<\/p>\n<ul>\n<li>Eden Regions&#xff08;\u4f0a\u7538\u533a&#xff09;<\/li>\n<li>Survivor Regions&#xff08;\u5e78\u5b58\u533a&#xff09;<\/li>\n<li>Old Regions&#xff08;\u8001\u5e74\u4ee3&#xff09;<\/li>\n<li>Humongous Regions&#xff08;\u5b58\u653e\u8d85\u8fc7Region\u5927\u5c0f50%\u7684\u5bf9\u8c61&#xff09;<\/li>\n<\/ul>\n<p>\u4f18\u52bf&#xff1a;<\/p>\n<ul>\n<li>\u907f\u514d\u5168\u5806\u56de\u6536&#xff0c;\u53ea\u56de\u6536\u5305\u542b\u5783\u573e\u6700\u591a\u7684Region<\/li>\n<li>\u5927\u5bf9\u8c61\u5355\u72ec\u5b58\u50a8&#xff0c;\u51cf\u5c11\u590d\u5236\u5f00\u9500<\/li>\n<\/ul>\n<h4>\u5de5\u4f5c\u6d41\u7a0b&#xff1a;<\/h4>\n<p>\u56de\u6536\u8fc7\u7a0b\u5206\u4e3aMinor GC\u548cMixed GC&#xff0c;\u5e76\u6700\u7ec8\u53ef\u80fd\u89e6\u53d1full GC&#xff08;\u5e94\u8be5\u5c3d\u91cf\u907f\u514d&#xff09;<\/p>\n<h5>Minor GC&#xff08;STW&#xff09;<\/h5>\n<p>\u7c7b\u4f3c\u4e8eParNew\u56de\u6536\u5668&#xff0c;\u4f46\u662f\u4f7f\u7528Region<\/p>\n<ul>\n<li>Eden\u533a\u6ee1\u65f6\u89e6\u53d1<\/li>\n<li>\u5e76\u884c\u6807\u8bb0\u5b58\u6d3b\u5bf9\u8c61&#xff08;STW&#xff09;<\/li>\n<li>\u590d\u5236\u5b58\u6d3b\u5bf9\u8c61&#xff08;STW&#xff09;\u5230Survivor\u533a\u6216Old\u533a<\/li>\n<li>\u6e05\u7a7aEden\u533a\u548cfrom\u533a&#xff0c;\u8c03\u6574Region\u5e03\u5c40<\/li>\n<\/ul>\n<h5>\u5e76\u53d1\u6807\u8bb0\u5468\u671f&#xff08;\u7c7b\u4f3c\u4e8eCMS\u7684\u56de\u6536\u6d41\u7a0b&#xff09;<\/h5>\n<ul>\n<li>\u8001\u5e74\u4ee3\u8fbe\u5230\u9608\u503c&#xff08;-XX&#xff1a;InitiatingHeapOccupancyPercent&#xff0c;\u9ed8\u8ba445%&#xff09;\u65f6\u6267\u884c<\/li>\n<\/ul>\n<h6>1\u3001\u521d\u59cb\u6807\u8bb0&#xff08;<span style=\"color:#fe2c24\">STW<\/span>&#xff09;&#xff1a;<\/h6>\n<ul>\n<li>\u5feb\u901f\u6807\u8bb0GC Roots\u5bf9\u8c61&#xff0c;STW\u65f6\u95f4\u6781\u77ed<\/li>\n<\/ul>\n<h6>2\u3001\u5e76\u53d1\u6807\u8bb0&#xff1a;<\/h6>\n<ul>\n<li>\u9012\u5f52\u904d\u5386\u5f15\u7528\u94fe&#xff0c;\u6807\u8bb0\u6240\u6709\u5b58\u6d3b\u5bf9\u8c61<\/li>\n<li>\u5e76\u53d1\u6267\u884c&#xff0c;\u4e0d\u963b\u585e\u7528\u6237\u7ebf\u7a0b<\/li>\n<li>\u7531\u4e8e\u7528\u6237\u7ebf\u7a0b\u53ef\u80fd\u4fee\u6539\u5f15\u7528&#xff0c;\u5bfc\u81f4\u201c\u6d6e\u52a8\u5783\u573e\u201d&#xff08;\u672c\u6b21GC\u65e0\u6cd5\u56de\u6536&#xff09;<\/li>\n<\/ul>\n<h6>3\u3001\u6700\u7ec8\u6807\u8bb0&#xff08;<span style=\"color:#fe2c24\">STW<\/span>&#xff09;&#xff1a;<\/h6>\n<ul>\n<li>\u4fee\u6b63\u5e76\u53d1\u65f6\u7528\u6237\u7ebf\u7a0b\u66f4\u6539\u7684\u5f15\u7528&#xff08;\u5173\u6ce8\u65b0\u589e\u5f15\u7528&#xff0c;\u9632\u6b62\u56de\u6536\u65b0\u7684\u5b58\u6d3b\u5bf9\u8c61&#xff0c;\u4f46\u65e0\u6cd5\u907f\u514d\u6d6e\u52a8\u5783\u573e&#xff09;<\/li>\n<\/ul>\n<h6>4\u3001\u7edf\u8ba1\u5b58\u6d3b\u5bf9\u8c61<\/h6>\n<ul>\n<li>\u7edf\u8ba1Region\u7684\u5b58\u6d3b\u5bf9\u8c61&#xff0c;\u4e3aMixed GC\u505a\u51c6\u5907<\/li>\n<\/ul>\n<h5>Mixed GC&#xff08;STW&#xff09;<\/h5>\n<ul>\n<li>\u5e76\u53d1\u6807\u8bb0\u5b8c\u6210\u540e&#xff0c;\u9009\u62e9\u5783\u573e\u6bd4\u4f8b\u9ad8\u7684Region\u8fdb\u884c\u56de\u6536<\/li>\n<li>\u590d\u5236\u5b58\u6d3b\u5bf9\u8c61\u5230\u7a7a\u95f2Region&#xff08;\u7c7b\u4f3cMinor GC&#xff09;<\/li>\n<li>\u6e05\u7406\u5783\u573eRegion&#xff0c;\u8c03\u6574\u5185\u5b58\u5e03\u5c40<\/li>\n<\/ul>\n<h5>Full GC&#xff08;\u5931\u8d25\u56de\u9000&#xff09;<\/h5>\n<ul>\n<li>\u5e76\u53d1\u6a21\u5f0f\u5931\u8d25&#xff08;\u56de\u6536\u901f\u5ea6\u8ddf\u4e0d\u4e0a\u5206\u914d\u901f\u5ea6&#xff09;\u6216\u5806\u5185\u5b58\u4e0d\u8db3\u65f6\u89e6\u53d1<\/li>\n<li>\u9000\u5316\u4e3aSerial Old&#xff08;\u5355\u7ebf\u7a0b\u6807\u8bb0\u2014\u6574\u7406&#xff09;&#xff0c;STW\u65f6\u95f4\u957f<\/li>\n<\/ul>\n<h4>G1\u4e0eCMS\u7684\u5bf9\u6bd4&#xff1a;<\/h4>\n<h5>\u4f7f\u7528\u8303\u56f4\u4e0d\u540c&#xff1a;<\/h5>\n<ul>\n<li>CMS\u662f\u8001\u5e74\u4ee3\u6536\u96c6\u5668<\/li>\n<li>G1\u6536\u96c6\u8303\u56f4\u662f\u65b0\u751f\u4ee3\u548c\u8001\u5e74\u4ee3<\/li>\n<\/ul>\n<h5>STW\u65f6\u95f4&#xff1a;<\/h5>\n<ul>\n<li>CMS\u4ee5\u6700\u5c0f\u7684\u505c\u987f\u65f6\u95f4\u4e3a\u76ee\u6807<\/li>\n<li>G1\u53ef\u9884\u6d4b\u5783\u573e\u56de\u6536\u7684\u505c\u987f\u65f6\u95f4&#xff0c;\u517c\u987e\u54cd\u5e94\u901f\u5ea6\u548c\u541e\u5410\u91cf<\/li>\n<\/ul>\n<h5>\u5783\u573e\u788e\u7247&#xff1a;<\/h5>\n<ul>\n<li>CMS\u4f1a\u4ea7\u751f\u788e\u7247\u5316\u5185\u5b58<\/li>\n<li>G1\u4f7f\u7528\u7684\u662f\u590d\u5236\u7b97\u6cd5&#xff0c;\u65e0\u788e\u7247\u5316\u5185\u5b58<\/li>\n<\/ul>\n<h3>\u8de8\u4ee3\u5f15\u7528\u53ca\u4f18\u5316\u65b9\u5f0f<\/h3>\n<p>\u8de8\u4ee3\u5f15\u7528\u6307\u65b0\u751f\u4ee3\u548c\u8001\u5e74\u4ee3\u5bf9\u8c61\u95f4\u53ef\u80fd\u5b58\u5728\u4e92\u76f8\u5f15\u7528\u7684\u5173\u7cfb&#xff0c;\u5728\u6267\u884cminor gc\u65f6\u5c31\u9700\u8981\u8fdb\u884c\u5168\u5806\u626b\u63cf\u6765\u786e\u5b9a\u5e78\u5b58\u5bf9\u8c61<\/p>\n<h4>\u89e3\u51b3\u65b9\u6848&#xff1a;<\/h4>\n<h5>1\u3001\u8bb0\u5fc6\u96c6&#xff1a;<\/h5>\n<p>\u8bb0\u5f55\u8001\u5e74\u4ee3\u533a\u57df\u6307\u5411\u65b0\u751f\u4ee3\u533a\u57df\u7684\u5f15\u7528&#xff0c;\u76f4\u63a5\u52a0\u5165\u5230GC roots\u4e2d<\/p>\n<h5>2\u3001\u5361\u8868&#xff1a;<\/h5>\n<ul>\n<li>\u8bb0\u5fc6\u96c6\u7684\u5177\u4f53\u5b9e\u73b0&#xff0c;\u5c06\u8001\u5e74\u4ee3\u5212\u5206\u4e3a\u591a\u4e2a\u5361\u9875&#xff08;\u9ed8\u8ba4512\u5b57\u8282&#xff09;<\/li>\n<li>\u5199\u5c4f\u969c&#xff1a;\u5f15\u7528\u53d8\u52a8\u65f6\u52a8\u6001\u66f4\u65b0\u5361\u8868&#xff0c;\u6807\u8bb0\u810f\u5361<\/li>\n<li>minor GC\u626b\u63cf\u65f6\u53ea\u9700\u8981\u626b\u63cf\u810f\u5361\u9875\u800c\u65e0\u9700\u5168\u5806\u626b\u63cf<\/li>\n<\/ul>\n<h5>3\u3001RSet&#xff1a;<\/h5>\n<ul>\n<li>G1\u56de\u6536\u5668\u5bf9\u8bb0\u5fc6\u96c6\u7684\u5177\u4f53\u5b9e\u73b0&#xff0c;\u7c7b\u4f3c\u4e8e\u5361\u8868<\/li>\n<li>Region\u5185\u90e8\u4f1a\u8bb0\u5f55\u5176\u4ed6Region\u5bf9\u5f53\u524dRegion\u5bf9\u8c61\u7684\u5f15\u7528<\/li>\n<\/ul>\n<h3>\u5e76\u53d1\u6807\u8bb0\u65f6\u7684\u5e76\u53d1\u5b89\u5168&#xff1a;<\/h3>\n<h4>CMS\u589e\u91cf\u66f4\u65b0&#xff1a;<\/h4>\n<ul>\n<li>\u5f53\u51fa\u73b0\u9ed1\u8272\u5bf9\u8c61\u65b0\u589e\u4e0e\u767d\u8272\u5bf9\u8c61\u7684\u5f15\u7528\u65f6&#xff0c;\u5199\u5c4f\u969c\u4f1a\u62e6\u622a\u8fd9\u4e00\u64cd\u4f5c&#xff0c;\u5e76\u5c06\u8be5\u9ed1\u8272\u5bf9\u8c61\u52a0\u5165\u589e\u91cf\u66f4\u65b0\u961f\u5217\u4e2d<\/li>\n<li>\u91cd\u65b0\u6807\u8bb0\u9636\u6bb5&#xff0c;CMS\u4f1a\u904d\u5386\u589e\u91cf\u66f4\u65b0\u961f\u5217&#xff0c;\u5c06\u9ed1\u8272\u5bf9\u8c61\u964d\u7ea7\u4e3a\u7070\u8272\u91cd\u65b0\u626b\u63cf\u5f15\u7528\u94fe&#xff0c;\u907f\u514d\u6f0f\u6807<\/li>\n<\/ul>\n<h4>G1\u5feb\u7167&#xff08;satb&#xff09;&#xff1a;<\/h4>\n<ul>\n<li>\u8bb0\u5f55\u5e76\u53d1\u6807\u8bb0\u5f00\u59cb\u524d\u7684\u5f15\u7528\u5173\u7cfb\u4f5c\u4e3a\u5feb\u7167&#xff0c;\u5199\u5c4f\u969c\u4f1a\u62e6\u622a\u5f15\u7528\u66f4\u65b0&#xff08;\u8986\u76d6\u6216\u5220\u9664&#xff09;\u5e76\u8bb0\u5f55\u65e7\u5f15\u7528<\/li>\n<li>\u82e5\u51fa\u73b0\u5feb\u7167\u4e2d\u4e0d\u5b58\u5728\u7684\u65b0\u5bf9\u8c61&#xff0c;\u5219\u76f4\u63a5\u6807\u8bb0\u4e3a\u5b58\u6d3b\u72b6\u6001&#xff08;\u9690\u5f0f\u6807\u8bb0&#xff0c;\u4e0d\u67d3\u8272&#xff09;<\/li>\n<li>\u5bf9\u4e8e\u5f15\u7528\u5220\u9664&#xff0c;\u5199\u5c4f\u969c\u4f1a\u8bb0\u5f55\u65e7\u5f15\u7528&#xff0c;\u5e76\u52a0\u5165satb\u961f\u5217\u4e2d&#xff0c;\u5728\u6700\u7ec8\u6807\u8bb0\u9636\u6bb5&#xff0c;\u4f1a\u5c06\u961f\u5217\u4e2d\u5b58\u5728\u4e8e\u5feb\u7167\u7684\u5bf9\u8c61\u6807\u8bb0\u4e3a\u9ed1\u8272&#xff0c;\u907f\u514d\u6f0f\u6807 \u00a0<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb757\u6b21\uff0c\u70b9\u8d5e9\u6b21\uff0c\u6536\u85cf16\u6b21\u3002\u5355\u6b21STW\u65f6\u95f4\u66f4\u77ed\u4f46\u66f4\u9891\u7e41\u6216\u5141\u8bb8\u7528\u6237\u7ebf\u7a0b\u548cGC\u7ebf\u7a0b\u5e76\u53d1\uff0c\u5bf9\u5ba2\u6237\u7aef\u4ea4\u4e92\u7684\u54cd\u5e94\u901f\u5ea6\u66f4\u5feb\u3002\uff081mb~32mb\uff0c\u53ef\u901a\u8fc7-XX\uff1aGHeapRegionSize\u8c03\u6574\uff09\uff0c\u5e76\u3002\u5355\u6b21STW\u65f6\u95f4\u66f4\u957f\uff0c\u4f46\u6b21\u6570\u5c11\uff0c\u9002\u5408\u8ba1\u7b97\u91cf\u5927\u4e14\u4ea4\u4e92\u4e0d\u591a\u7684\u573a\u666f\u3002\u7c7b\u4f3c\u4e8eParNew\u56de\u6536\u5668\uff0c\u4f46\u662f\u4f7f\u7528Region\u3002\uff0c\u65e8\u5728\u51cf\u5c11STW\u65f6\u95f4\uff0c\u9002\u7528\u4e8e\u3002\uff08\u7c7b\u4f3c\u4e8e\u6df1\u5ea6\u641c\u7d22\uff09\uff0c<\/p>\n","protected":false},"author":2,"featured_media":39767,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[426],"topic":[],"class_list":["post-39768","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-jvm"],"yoast_head":"<!-- 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