{"id":677,"date":"2016-05-21T19:24:00","date_gmt":"2016-05-21T19:24:00","guid":{"rendered":"http:\/\/blogs.softwareclue.com\/?p=677"},"modified":"2016-05-21T19:24:00","modified_gmt":"2016-05-21T19:24:00","slug":"java%e6%80%a7%e8%83%bd%e4%bc%98%e5%8c%96%e5%85%a8%e6%94%bb%e7%95%a5","status":"publish","type":"post","link":"http:\/\/blog.softwareclues.com\/zh\/java%e6%80%a7%e8%83%bd%e4%bc%98%e5%8c%96%e5%85%a8%e6%94%bb%e7%95%a5","title":{"rendered":"Java\u6027\u80fd\u4f18\u5316\u5168\u653b\u7565"},"content":{"rendered":"<blockquote><p><strong>\u6765\u81ea\uff1a\u6167\u90fd\u63a7\u4ef6\u7f51<\/strong><\/p>\n<p><strong>\u94fe\u63a5\uff1ahttps:\/\/www.evget.com\/article\/2016\/5\/17\/24105.html<\/strong><\/p>\n<p><strong>\u539f\u6587\uff1ahttp:\/\/www.oracle.com\/technetwork\/java\/javaseproducts\/mission-control\/java-mission-control-wp-2008279.pdf<\/strong><\/p><\/blockquote>\n<p>\u8ba9Java\u5e94\u7528\u7a0b\u5e8f\u8fd0\u884c\u662f\u4e00\u56de\u4e8b\uff0c\u4f46\u8ba9\u4ed6\u4eec\u8dd1\u5f97\u5feb\u5c31\u662f\u53e6\u5916\u4e00\u56de\u4e8b\u4e86\u3002\u5728\u9762\u5bf9\u5bf9\u8c61\u7684\u73af\u5883\u4e2d\uff0c\u6027\u80fd\u95ee\u9898\u5c31\u50cf\u6765\u52bf\u51f6\u731b\u7684\u91ce\u517d\u3002\u4f46JVM\u7684\u590d\u6742\u6027\u5c06\u6027\u80fd\u8c03\u6574\u7684\u590d\u6742\u7a0b\u5ea6\u589e\u52a0\u4e86\u4e00\u4e2a\u7ea7\u522b\u3002\u8fd9\u91ccRefcard\u6db5\u76d6\u4e86JVM internals\u3001class loading\uff08Java8\u4e2d\u66f4\u65b0\u4ee5\u6620\u5c04\u6700\u65b0\u7684\u5143\u7a7a\u95f4\uff09\u3001\u5783\u573e\u56de\u6536\u3001\u6545\u969c\u8bca\u65ad\u3001\u68c0\u6d4b\u3001\u5e76\u53d1\u6027\uff0c\u7b49\u7b49\u3002<\/p>\n<h2><strong>\u4ecb\u7ecd<\/strong><\/h2>\n<p>Java\u662f\u76ee\u524d\u8f6f\u4ef6\u5f00\u53d1\u9886\u57df\u4e2d\u4f7f\u7528\u6700\u5e7f\u6cdb\u7684\u7f16\u7a0b\u8bed\u8a00\u4e4b\u4e00\u3002Java\u5e94\u7528\u7a0b\u5e8f\u5728\u8bb8\u591a\u5782\u76f4\u9886\u57df\uff08\u94f6\u884c\u3001\u7535\u4fe1\u3001\u533b\u7597\u4fdd\u5065\u7b49\uff09\u4e2d\u90fd\u6709\u5e7f\u6cdb\u4f7f\u7528\u3002Refcard\u7684\u76ee\u7684\u662f\uff0c\u5e2e\u52a9\u5f00\u53d1\u8005\u901a\u8fc7\u4e13\u6ce8\u4e8eJVM\u5185\u90e8\uff0c\u6027\u80fd\u8c03\u6574\u539f\u5219\u548c\u6700\u4f73\u5b9e\u8df5\uff0c\u4ee5\u53ca\u5229\u7528\u73b0\u6709\u76d1\u6d4b\u548c\u6545\u969c\u8bca\u65ad\u5de5\u5177\uff0c\u6765\u63d0\u5347\u5e94\u7528\u7a0b\u5e8f\u5728\u5546\u4e1a\u73af\u5883\u4e2d\u7684\u6027\u80fd\u3002<\/p>\n<p>\u5b83\u80fd\u4ee5\u4e0d\u540c\u7684\u65b9\u5f0f\u5b9a\u4e49\u201coptimal performance\uff08\u6700\u4f73\u6027\u80fd\uff09\u201d\uff0c\u4f46\u57fa\u672c\u8981\u7d20\u662f\uff1aJava\u7a0b\u5e8f\u5728\u4e1a\u52a1\u54cd\u5e94\u65f6\u95f4\u8981\u6c42\u5185\u6267\u884c\u8ba1\u7b97\u4efb\u52a1\u7684\u80fd\u529b\uff0c\u7a0b\u5e8f\u5728\u9ad8\u5bb9\u91cf\u4e0b\u6267\u884c\u4e1a\u52a1\u529f\u80fd\u7684\u80fd\u529b\uff0c\u5e76\u5177\u6709\u53ef\u9760\u6027\u9ad8\u548c\u5ef6\u8fdf\u4f4e\u7684\u7279\u70b9\u3002\u6709\u65f6,\u6570\u5b57\u672c\u8eab\u53d8\u5f97\u6a21\u5f0f\u5316\uff1a\u5bf9\u4e8e\u4e00\u4e9b\u5927\u578b\u7f51\u7ad9\uff0c\u4f18\u79c0\u7684\u9875\u9762\u54cd\u5e94\u65f6\u95f4\u5e94\u8be5\u5728500ms\u4ee5\u4e0b\u3002\u5728\u9002\u5f53\u7684\u65f6\u5019\uff0cRefcard\u5305\u62ec\u76ee\u6807\u6570\u5b57\u3002\u4f46\u5728\u5927\u591a\u6570\u60c5\u51b5\u4e0b\uff0c\u60a8\u9700\u8981\u6839\u636e\u4e1a\u52a1\u9700\u6c42\u548c\u73b0\u6709\u7684\u6027\u80fd\u57fa\u51c6\u81ea\u5df1\u51b3\u5b9a\u8fd9\u4e9b\u3002<\/p>\n<h2><strong>JVM Internals<\/strong><\/h2>\n<h4><strong>\u57fa\u7840\u77e5\u8bc6<\/strong><\/h4>\n<p><img decoding=\"async\" src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQtSSXIFrrXD62JyG3JIqFz02QPUodYpjlrsvYVddZhVt7RoRU59PNZVg\/640?wx_fmt=jpeg&amp;wxfrom=5&amp;wx_lazy=1\" data-s=\"300,640\" data-type=\"jpeg\" data-src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQtSSXIFrrXD62JyG3JIqFz02QPUodYpjlrsvYVddZhVt7RoRU59PNZVg\/0?wx_fmt=jpeg\" data-ratio=\"0.7086330935251799\" data-w=\"\" \/><\/p>\n<h4><\/h4>\n<h4><strong>\u4ee3\u7801\u7f16\u8bd1\u548cJIT<\/strong><\/h4>\n<p>\u7f16\u8bd1Java\u5b57\u8282\u7801\u663e\u7136\u6ca1\u6709\u76f4\u63a5\u4ece\u4e3b\u673a\u6267\u884c\u672c\u673a\u4ee3\u7801\u90a3\u4e48\u5feb\u3002\u4e3a\u4e86\u63d0\u9ad8\u6027\u80fd\uff0cHotspot JVM\u627e\u51fa\u6700\u7e41\u5fd9\u7684\u5b57\u8282\u7801\u533a\u57df\uff0c\u7136\u540e\u5c06\u5176\u7f16\u8bd1\u6210\u66f4\u9ad8\u6548\u5730\u539f\u751f\u3001\u673a\u5668\u4ee3\u7801\uff08\u81ea\u9002\u5e94\u4f18\u5316\uff09\u3002\u7136\u540e\u8fd9\u79cd\u672c\u5730\u4ee3\u7801\u5c31\u4f1a\u5b58\u50a8\u5728\u975e\u5806\u5185\u5b58\u4e2d\u7684\u4ee3\u7801\u7f13\u5b58\u4e2d\u3002<\/p>\n<p>\u6ce8\u610f\uff1a\u591a\u6570\u7684JVM\u662f\u901a\u8fc7\u7981\u7528JIT\u7f16\u8bd1\u5668\u5b9e\u73b0\u7684(Djava.compiler=NONE)\u3002\u60a8\u53ea\u9700\u8981\u8003\u8651\u7981\u7528\u7684\u5173\u952e\u6027\u4f18\u5316\uff0c\u6bd4\u5982JVM\u5d29\u6e83\u3002<\/p>\n<p>\u4e0b\u56fe\u8bf4\u660e\u4e86Java\u6e90\u4ee3\u7801\uff0c\u5373\u65f6\u7f16\u8bd1\u6d41\u7a0b\u548c\u751f\u547d\u5468\u671f\u3002<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQtJEu3RgXicmT2YvrfInib7r3Sco36xdFLmAqf2icu7CZicoYpWCkghLnE9g\/640?wx_fmt=jpeg&amp;wxfrom=5&amp;wx_lazy=1\" data-s=\"300,640\" data-type=\"jpeg\" data-src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQtJEu3RgXicmT2YvrfInib7r3Sco36xdFLmAqf2icu7CZicoYpWCkghLnE9g\/0?wx_fmt=jpeg\" data-ratio=\"1.116152450090744\" data-w=\"551\" \/><\/p>\n<h4><\/h4>\n<h4><strong>\u5185\u5b58\u7a7a\u95f4<\/strong><\/h4>\n<p>HotSpot Java Virtual Machine\u662f\u7531\u4ee5\u4e0b\u7684\u5b58\u50a8\u7a7a\u95f4\u7ec4\u6210\u3002<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQtTnIy0RXxAcq6jOqwTWBjLqlhTffhc7QRLdYMdTFoTCmBFbHap7IXNg\/640?wx_fmt=png&amp;wxfrom=5&amp;wx_lazy=1\" data-s=\"300,640\" data-type=\"png\" data-src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQtTnIy0RXxAcq6jOqwTWBjLqlhTffhc7QRLdYMdTFoTCmBFbHap7IXNg\/0?wx_fmt=png\" data-ratio=\"0.2643884892086331\" data-w=\"\" \/><\/p>\n<h2><\/h2>\n<h2><strong>\u7c7b\u52a0\u8f7d<\/strong><\/h2>\n<p>Java\u7684\u53e6\u4e00\u4e2a\u91cd\u8981\u7279\u70b9\u662f\uff0c\u5728JVM\u542f\u52a8\u4e4b\u540e\uff0c\u5b83\u80fd\u591f\u52a0\u8f7d\u7f16\u8bd1\u7684Java\u7c7b\uff08\u5b57\u8282\u7801\uff09\u3002\u6839\u636e\u7a0b\u5e8f\u7684\u5927\u5c0f\uff0c\u5728\u521a\u521a\u91cd\u542f\u4e4b\u540e\uff0c\u7a0b\u5e8f\u5728\u7c7b\u52a0\u8f7d\u8fc7\u7a0b\u4e2d\u6027\u80fd\u4f1a\u663e\u8457\u964d\u4f4e\u3002\u8fd9\u79cd\u73b0\u8c61\u662f\u56e0\u4e3a\u5185\u90e8JIT\u7f16\u8bd1\u5668\u5728\u91cd\u542f\u4e4b\u540e\u9700\u8981\u91cd\u65b0\u5f00\u59cb\u4f18\u5316\u3002<\/p>\n<p>\u81eaJDK 1.7\u7248\u672c\u4e4b\u540e\uff0c\u6709\u4e00\u4e9b\u6539\u8fdb\u503c\u5f97\u5927\u5bb6\u91cd\u89c6\u3002\u4f8b\u5982\u9ed8\u8ba4\u7684JDK class loader\u5177\u6709\u66f4\u597d\u7684\u88c5\u5728\u7c7b\u5e76\u53d1\u80fd\u529b\u3002<\/p>\n<h4><strong>\u70ed\u70b9<\/strong><\/h4>\n<p><img decoding=\"async\" src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQtu8ksic8X63iafAnJicUWLGMC5k4Yic5T4P7eEYhn45n9k26t9KlsEw6Nzw\/640?wx_fmt=png&amp;wxfrom=5&amp;wx_lazy=1\" data-s=\"300,640\" data-type=\"png\" data-src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQtu8ksic8X63iafAnJicUWLGMC5k4Yic5T4P7eEYhn45n9k26t9KlsEw6Nzw\/0?wx_fmt=png\" data-ratio=\"0.4064748201438849\" data-w=\"\" \/><br \/>\n<img decoding=\"async\" src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQtTZspOnB9Qr15XdNqCGa96dh79zDZ3hP53sz9WcH7mEGqcJkoGicJhWQ\/640?wx_fmt=jpeg&amp;wxfrom=5&amp;wx_lazy=1\" data-s=\"300,640\" data-type=\"jpeg\" data-src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQtTZspOnB9Qr15XdNqCGa96dh79zDZ3hP53sz9WcH7mEGqcJkoGicJhWQ\/0?wx_fmt=jpeg\" data-ratio=\"0.8758992805755396\" data-w=\"\" \/><\/p>\n<h2><\/h2>\n<h2><strong>\u6545\u969c\u8bca\u65ad\u548c\u76d1\u89c6<\/strong><\/h2>\n<p><img decoding=\"async\" src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQt1gyibY6oiaH9T2bgaqlTKicb8BDwQcjoaC7JfsQECV5N8kNtFFFY8Kj2Q\/640?wx_fmt=png&amp;wxfrom=5&amp;wx_lazy=1\" data-s=\"300,640\" data-type=\"png\" data-src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQt1gyibY6oiaH9T2bgaqlTKicb8BDwQcjoaC7JfsQECV5N8kNtFFFY8Kj2Q\/0?wx_fmt=png\" data-ratio=\"0.6672661870503597\" data-w=\"\" \/><\/p>\n<h2><\/h2>\n<h2><strong>\u5783\u573e\u56de\u6536<\/strong><\/h2>\n<p>Java\u5783\u573e\u56de\u6536\u6d41\u7a0b\u5bf9\u4e8e\u7a0b\u5e8f\u6027\u80fd\u662f\u81f3\u5173\u91cd\u8981\u7684\u3002\u4e3a\u4e86\u63d0\u4f9b\u6709\u6548\u7684\u5783\u573e\u56de\u6536\uff0cHeap\uff08\u5806\uff09\u672c\u8d28\u4e0a\u662f\u5212\u5206\u5728\u5b50\u533a\u57df\u4e2d\u3002<\/p>\n<h4><strong>\u5806\u533a\u57df<\/strong><\/h4>\n<p><img decoding=\"async\" src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQtibMTQS2fib4O3wlIjdwxqBPJhQtEibUxahn6qP9DhDZtNQS3nduacjhMw\/640?wx_fmt=png&amp;wxfrom=5&amp;wx_lazy=1\" data-s=\"300,640\" data-type=\"png\" data-src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQtibMTQS2fib4O3wlIjdwxqBPJhQtEibUxahn6qP9DhDZtNQS3nduacjhMw\/0?wx_fmt=png\" data-ratio=\"0.3669064748201439\" data-w=\"\" \/><br \/>\n<img decoding=\"async\" src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQt5l9qjXm3P2pjO76H92lrnwuAovl3CZenITHEaKLbQG9bkGAmwjX0dA\/640?wx_fmt=jpeg&amp;wxfrom=5&amp;wx_lazy=1\" data-s=\"300,640\" data-type=\"jpeg\" data-src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQt5l9qjXm3P2pjO76H92lrnwuAovl3CZenITHEaKLbQG9bkGAmwjX0dA\/0?wx_fmt=jpeg\" data-ratio=\"0.7877697841726619\" data-w=\"\" \/><\/p>\n<h4><\/h4>\n<h4><strong>GC Collectors<\/strong><\/h4>\n<p>\u9009\u62e9\u6b63\u786e\u7684collector\u6216GC policy\u53ef\u4ee5\u5c06\u7a0b\u5e8f\u7684\u6027\u80fd\u3001\u53ef\u6269\u5c55\u6027\u548c\u53ef\u9760\u6027\u4f18\u5316\u5230\u6700\u4f73\u72b6\u6001\u3002\u8bb8\u591a\u5e94\u7528\u7a0b\u5e8f\u5bf9\u4e8e\u54cd\u5e94\u65f6\u95f4\u5ef6\u8fdf\u90fd\u5f88\u654f\u611f\uff0c\u56e0\u6b64\u5927\u591a\u9700\u8981\u4f7f\u7528\u5e76\u53d1\u7684\u56de\u6536\u5668\uff0c\u4f8b\u5982HotSpot CMS\u6216IBM GC policy balanced\u3002<\/p>\n<p>\u6211\u4eec\u5f3a\u70c8\u5efa\u8bae\u60a8\u901a\u8fc7\u9002\u5f53\u7684\u6027\u80fd\u548c\u8d1f\u8f7d\u6d4b\u8bd5\u786e\u5b9a\u6700\u5408\u9002\u7684GC\u7b56\u7565\u3002\u5e94\u8be5\u5728\u751f\u4ea7\u73af\u5883\u4e2d\u6267\u884c\u5168\u9762\u76d1\u63a7\u7b56\u7565\uff0c\u4ee5\u8ddf\u8e2a\u6574\u4f53\u7684JVM\u6027\u80fd\uff0c\u5e76\u786e\u5b9a\u5728\u4e4b\u540e\u9700\u8981\u6539\u8fdb\u7684\u9886\u57df\u3002<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQtEOm3puibM8pU1g6xC6lMy7JzooLPvZdEmOBeLvXq2S2iaHNxsNveMygg\/640?wx_fmt=png&amp;wxfrom=5&amp;wx_lazy=1\" data-s=\"300,640\" data-type=\"png\" data-src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQtEOm3puibM8pU1g6xC6lMy7JzooLPvZdEmOBeLvXq2S2iaHNxsNveMygg\/0?wx_fmt=png\" data-ratio=\"0.4658273381294964\" data-w=\"\" \/><br \/>\n<img decoding=\"async\" src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQtpWfWcypx3KaMHxZIgclyRp6oOsAHHWBNiape1N9pDCsh5GSR02dHfUQ\/640?wx_fmt=png&amp;wxfrom=5&amp;wx_lazy=1\" data-s=\"300,640\" data-type=\"png\" data-src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQtpWfWcypx3KaMHxZIgclyRp6oOsAHHWBNiape1N9pDCsh5GSR02dHfUQ\/0?wx_fmt=png\" data-ratio=\"0.564748201438849\" data-w=\"\" \/><br \/>\n<img decoding=\"async\" src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQtNaJMr3QGQKS3U6CHlqic2HRSu49uxsKtl3QYaeib68a8hzETJX95NtDQ\/640?wx_fmt=png&amp;wxfrom=5&amp;wx_lazy=1\" data-s=\"300,640\" data-type=\"png\" data-src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQtNaJMr3QGQKS3U6CHlqic2HRSu49uxsKtl3QYaeib68a8hzETJX95NtDQ\/0?wx_fmt=png\" data-ratio=\"0.6672661870503597\" data-w=\"\" \/><\/p>\n<h4><\/h4>\n<h4><strong>Garbage First (G1) Collector<\/strong><\/h4>\n<p>HotSpot G1 collector\u662f\u4e13\u4e3a\u662f\u4e13\u4e3a\u6ee1\u8db3\u7528\u6237\u5b9a\u4e49\u7684\u5783\u573e\u56de\u6536\uff08GC\uff09\u9ad8\u6982\u7387\u6682\u505c\u65f6\u95f4\u8bbe\u8ba1\u7684\uff0c\u540c\u65f6\u5b9e\u73b0\u9ad8\u541e\u5410\u91cf\u3002<\/p>\n<p>\u6700\u65b0\u7684HotSpot collector\u5c06heap\u57fa\u672c\u5212\u5206\u5230\u4e00\u7ec4\u5927\u5c0f\u76f8\u7b49\u7684\u5806\u533a\u57df\uff0c\u865a\u62df\u5185\u5b58\u7684\u6bcf\u4e2a\u533a\u57df\u8fde\u7eed\u8303\u56f4\u3002\u5b83\u5c06\u56de\u6536\u538b\u7f29\u7684\u6d3b\u52a8\u96c6\u4e2d\u5728heap\u533a\u57df\uff0c\u90a3\u91cc\u5145\u6ee1\u4e86\u53ef\u56de\u6536\u7684\u5bf9\u8c61\uff08garbage first\uff09\u3002\u6362\u53e5\u8bdd\u8bf4\u5c31\u662f\uff0c\u8fd9\u4e2a\u533a\u57df\u6709\u6700\u4f4e\u9650\u5ea6\u7684\u201clive\u201d\u5bf9\u8c61\u3002<\/p>\n<p>Oracle\u5efa\u8bae\u5728\u4ee5\u4e0b\u4f8b\u5b50\u548c\u60c5\u51b5\u4e0b\u4f7f\u7528G1 collector\uff0c\u5c24\u5176\u662f\u5bf9\u4e8e\u76ee\u524d\u6b63\u5728\u4f7f\u7528CMS\u6216parallel collectors\u7684\uff1a<\/p>\n<ul class=\"list-paddingleft-2\">\n<li>\u4e13\u4e3alarge heaps(&gt;= 6 GB)\uff0c\u5e76\u9650\u5236GC\u5ef6\u8fdf\uff08\u6682\u505c\u65f6\u95f4&lt;= 0.5\u79d2)\u7684\u5e94\u7528\u7a0b\u5e8f\u8bbe\u8ba1\u3002<\/li>\n<li>\u8d85\u8fc750%\u7684Java heap\u88ab\u5b9e\u65f6\u6570\u636e\u5360\u7528\uff08\u5bf9\u8c61\u4e0d\u80fd\u88abGC\u56de\u6536\uff09\u3002<\/li>\n<li>\u5bf9\u8c61\u5206\u6790\u7387\u548c\u4fc3\u8fdb\u4f5c\u7528\u663e\u8457\u53d8\u5316\u3002<\/li>\n<li>\u4e0d\u671f\u671b\u8fc7\u957f\u7684\u5783\u573e\u56de\u6536\u6216\u538b\u7f29\u505c\u987f\uff08\u8d85\u8fc70.5\u81f31\u79d2\uff09\u3002<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQtN4DzeIdcflxicXLwAXByf9El1kLlsk7tmosQxp6pTPPa6LTickuslWHQ\/640?wx_fmt=jpeg&amp;wxfrom=5&amp;wx_lazy=1\" data-s=\"300,640\" data-type=\"jpeg\" data-src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQtN4DzeIdcflxicXLwAXByf9El1kLlsk7tmosQxp6pTPPa6LTickuslWHQ\/0?wx_fmt=jpeg\" data-ratio=\"0.7338129496402878\" data-w=\"\" \/><\/p>\n<h4><\/h4>\n<h4><strong>Java Heap\u5c3a\u5bf8<\/strong><\/h4>\n<p>\u4f60\u4e00\u5b9a\u8981\u77e5\u9053\u6ca1\u6709GC\u7b56\u7565\u53ef\u4ee5\u633d\u6551Java Heap\u5c3a\u5bf8\u4e0d\u8db3\u7684\u73b0\u8c61\u3002\u8fd9\u4e9b\u6f14\u4e60\u6d89\u53ca\u5230\u4e3a\u4e0d\u540c\u7684\u5b58\u50a8\u7a7a\u95f4\uff08\u5305\u62ec\u65b0\u65e7\u4e0d\u540c\u7684\u7248\u672c\uff09\u914d\u7f6e\u6700\u5927\u548c\u6700\u5c0f\u7684\u5bb9\u91cf\uff0c\u5305\u62ec\u5143\u6570\u636e\u548c\u672c\u5730\u5185\u5b58\u5bb9\u91cf\u3002\u8fd9\u91cc\u6709\u4e00\u4e9b\u5efa\u8bae\u51c6\u5219\uff1a<\/p>\n<ul class=\"list-paddingleft-2\">\n<li>\u572832-bit\u621664-bit JVM\u4e4b\u95f4\u8fdb\u884c\u660e\u667a\u7684\u9009\u62e9\u3002\u5982\u679c\u7a0b\u5e8f\u8fd0\u884c\u9700\u8981\u8d85\u8fc72GB\u5185\u5b58\uff0c\u5e76\u4e14JVM\u6682\u505c\u65f6\u95f4\u5728\u53ef\u63a5\u53d7\u8303\u56f4\u5185\uff0c\u53ef\u4ee5\u8003\u8651\u4f7f\u752864-bit JVM\u3002<\/li>\n<li>\u6c38\u8fdc\u5c06\u5e94\u7528\u7a0b\u5e8f\u653e\u5728\u7b2c\u4e00\u8003\u8651\u3002\u786e\u4fdd\u5c06\u5176\u914d\u7f6e\u597d\uff0c\u5e76\u6839\u636e\u7a0b\u5e8f\u7684\u5185\u5b58\u5360\u7528\u91cf\u8c03\u6574heap\u5c3a\u5bf8\u3002\u5efa\u8bae\u901a\u8fc7\u6027\u80fd\u548c\u8d1f\u8f7d\u6d4b\u8bd5\u6765\u8861\u91cf\u5b9e\u65f6\u6570\u636e\u5360\u6709\u91cf\u3002<\/li>\n<li>larger heap\u5e76\u4e0d\u603b\u662f\u8868\u73b0\u5f97\u66f4\u597d\u3001\u66f4\u5feb\uff0c\u56e0\u6b64\u4e0d\u9700\u8981\u8fc7\u5ea6\u8c03\u6574Java heap\u3002\u5e76\u884c\u4e2d\u7684JVM\u6027\u80fd\u8c03\u4f18\uff0c\u627e\u51c6\u673a\u4f1a\u51cf\u5c11\u6216\u201cspread\u201d\u7a0b\u5e8f\u7684\u5185\u5b58\u5360\u6709\u91cf\uff0c\u4ee5\u4fdd\u8bc1JVM\u7684\u5e73\u5747\u54cd\u5e94\u65f6\u95f4\uff1c1%\u3002<\/li>\n<li>\u5bf9\u4e8e32-bit JVM\uff0c\u4e3a\u4e86\u4ece\u5143\u6570\u636e\u548c\u672c\u5730heap\u4e2d\u7559\u51fa\u4e00\u4e9b\u5185\u5b58\uff0c\u8003\u86512GB\u7684\u6700\u5927heap\u5c3a\u5bf8\u3002<\/li>\n<li>\u5bf9\u4e8e64-bit JVM\uff0c\u6211\u4eec\u8981\u60f3\u529e\u6cd5\u5728\u5782\u76f4\u548c\u6c34\u5e73\u5c42\u9762\u8fdb\u884c\u6269\u5c55\uff0c\u800c\u4e0d\u662f\u8bd5\u56fe\u5c06Java heap\u5c3a\u5bf8\u589e\u52a0\u523015GB\u4ee5\u4e0a\u3002\u8fd9\u79cd\u505a\u6cd5\u5f80\u5f80\u63d0\u4f9b\u66f4\u597d\u7684\u541e\u5410\u91cf\uff0c\u66f4\u597d\u5730\u5229\u7528\u786c\u4ef6\uff0c\u63d0\u9ad8\u5e94\u7528\u7a0b\u5e8f\u7684\u6545\u969c\u5207\u6362\u529f\u80fd\u3002<\/li>\n<li>\u4e0d\u8bb8\u91cd\u590d\u5f00\u53d1\uff1a\u5145\u5206\u5229\u7528\u5f00\u6e90\u4ee5\u53ca\u5546\u4e1a\u6545\u969c\u6392\u9664\u7684\u4f18\u52bf\u548c\u76d1\u63a7\u5de5\u5177\uff0c\u4f7f\u8fd9\u4e9b\u53d8\u6210\u53ef\u80fd\u3002APM\uff08\u5e94\u7528\u6027\u80fd\u7ba1\u7406\uff09\u4ea7\u54c1\u5728\u8fc7\u53bb\u5341\u5e74\u91cc\u53d1\u5c55\u8fc5\u731b\u3002<\/li>\n<\/ul>\n<h4><strong>JDK 1.8 Metaspace\u6307\u5357<\/strong><\/h4>\n<p><img decoding=\"async\" src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQtCONrEVfyuo8HOluC3rvUG4MQMBLicpgykD2P1CBzRkwUzKLyZqr9Cvw\/640?wx_fmt=png&amp;wxfrom=5&amp;wx_lazy=1\" data-s=\"300,640\" data-type=\"png\" data-src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQtCONrEVfyuo8HOluC3rvUG4MQMBLicpgykD2P1CBzRkwUzKLyZqr9Cvw\/0?wx_fmt=png\" data-ratio=\"0.35071942446043164\" data-w=\"\" \/><\/p>\n<h4><\/h4>\n<h4><strong>Hot Spots<\/strong><\/h4>\n<p><img decoding=\"async\" src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQtAGbTfrSHOToibN2icIFKA8umDibaCgFib2JKlNqQczYRBibcwt9cJ4Pxd5g\/640?wx_fmt=jpeg&amp;wxfrom=5&amp;wx_lazy=1\" data-s=\"300,640\" data-type=\"jpeg\" data-src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQtAGbTfrSHOToibN2icIFKA8umDibaCgFib2JKlNqQczYRBibcwt9cJ4Pxd5g\/0?wx_fmt=jpeg\" data-ratio=\"0.7859712230215827\" data-w=\"\" \/><\/p>\n<h4><\/h4>\n<h4><strong>\u6545\u969c\u8bca\u65ad\u548c\u76d1\u89c6<\/strong><\/h4>\n<p><img decoding=\"async\" src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQtKGkGj33dk1E9ybpCMXhsPTvEck4Fl2YlrIVia5R4dEtr4ztG8PuyJHQ\/640?wx_fmt=png&amp;wxfrom=5&amp;wx_lazy=1\" data-s=\"300,640\" data-type=\"png\" data-src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQtKGkGj33dk1E9ybpCMXhsPTvEck4Fl2YlrIVia5R4dEtr4ztG8PuyJHQ\/0?wx_fmt=png\" data-ratio=\"0.38848920863309355\" data-w=\"\" \/><br \/>\n<img decoding=\"async\" src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQtkOdmaB0JviaP2Vcib6iaN5RNsHXWlsmM4rh1F4IX5B7xRiaByceK260h6A\/640?wx_fmt=png&amp;wxfrom=5&amp;wx_lazy=1\" data-s=\"300,640\" data-type=\"png\" data-src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQtkOdmaB0JviaP2Vcib6iaN5RNsHXWlsmM4rh1F4IX5B7xRiaByceK260h6A\/0?wx_fmt=png\" data-ratio=\"0.6151079136690647\" data-w=\"\" \/><br \/>\n<img decoding=\"async\" src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQtFYZxnq3NiaoSCSZtibABSL9YrsIwbgmjO3aJ1Om0f0R6o5yy9O4iawJbQ\/640?wx_fmt=png&amp;wxfrom=5&amp;wx_lazy=1\" data-s=\"300,640\" data-type=\"png\" data-src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQtFYZxnq3NiaoSCSZtibABSL9YrsIwbgmjO3aJ1Om0f0R6o5yy9O4iawJbQ\/0?wx_fmt=png\" data-ratio=\"0.289568345323741\" data-w=\"\" \/><\/p>\n<h2><\/h2>\n<h2><strong>Java\u5e76\u53d1\u6027<\/strong><\/h2>\n<p>Java\u5e76\u53d1\u6027\u53ef\u4ee5\u5b9a\u4e49\u4e3a\u7a0b\u5e8f\u540c\u65f6\u6267\u884c\u591a\u4e2a\u4efb\u52a1\u7684\u80fd\u529b\u3002\u5bf9\u4e8e\u5927\u578b\u7684Java EE\u7cfb\u7edf\uff0c\u8fd9\u610f\u5473\u7740\u6267\u884c\u591a\u4e2a\u7528\u6237\u7684\u4e1a\u52a1\u529f\u80fd\u7684\u540c\u65f6\uff0c\u5b9e\u73b0\u6700\u4f73\u7684\u541e\u5410\u91cf\u548c\u6027\u80fd\u7684\u80fd\u529b\u3002<\/p>\n<p>\u65e0\u8bba\u662f\u786c\u4ef6\u80fd\u529b\u8fd8\u662fJVM\u7a33\u5b9a\u72b6\u51b5\uff0cJava\u5e76\u53d1\u6027\u95ee\u9898\u53ef\u80fd\u5f15\u8d77\u7a0b\u5e8f\u7684\u762b\u75ea\uff0c\u4e25\u91cd\u5f71\u54cd\u7a0b\u5e8f\u7684\u6574\u4f53\u6027\u80fd\u548c\u53ef\u7528\u6027\u3002<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQt6GjuPakrP9ibibEfoocqBicRaxMtXwygrUuKoP30Pqjpr8wppibqyEOIhw\/640?wx_fmt=jpeg&amp;wxfrom=5&amp;wx_lazy=1\" data-s=\"300,640\" data-type=\"jpeg\" data-src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQt6GjuPakrP9ibibEfoocqBicRaxMtXwygrUuKoP30Pqjpr8wppibqyEOIhw\/0?wx_fmt=jpeg\" data-ratio=\"0.9168207024029574\" data-w=\"541\" \/><\/p>\n<h4><\/h4>\n<h4><strong>Thread Lock Contention<\/strong><\/h4>\n<p>\u5f53\u60a8\u8bc4\u4f30Java\u5e94\u7528\u7a0b\u5e8f\u7684\u5e76\u53d1\u7ebf\u7a0b\u7684\u7a33\u5b9a\u72b6\u51b5\u65f6\uff0c\u4f60\u4f1a\u7ecf\u5e38\u9047\u5230Thread lock contention\u7684\u95ee\u9898\uff0c\u8fd9\u662f\u76ee\u524d\u6700\u5e38\u89c1\u7684Java\u5e76\u53d1\u95ee\u9898\u3002<\/p>\n<p>\u4f8b\u5982\uff1aThread lock contention\u4f1a\u89e6\u53d1non-stop\uff0c\u5b83\u4f1a\u5c1d\u8bd5\u5c06\u4e00\u4e2a\u7f3a\u5c11Java\u7c7b\uff08ClassNotFoundException\u7684\uff09\u52a0\u8f7d\u5230\u9ed8\u8ba4\u7684JDK 1.7 ClassLoader\u3002<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQtgMeTsb4RlSGlqnXdicTuhfVlFKLibgica68y2jdicdgz2PbGl9u4SMd4yA\/640?wx_fmt=jpeg&amp;wxfrom=5&amp;wx_lazy=1\" data-s=\"300,640\" data-type=\"jpeg\" data-src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQtgMeTsb4RlSGlqnXdicTuhfVlFKLibgica68y2jdicdgz2PbGl9u4SMd4yA\/0?wx_fmt=jpeg\" data-ratio=\"0.329136690647482\" data-w=\"\" \/><\/p>\n<p>\u5982\u679c\u60a8\u5728\u6210\u719f\u7684\u6280\u672f\u73af\u5883\u4e2d\u9047\u89c1\u50cfThread Dump analysis\u8fd9\u6837\u7684\u95ee\u9898\uff0c\u6211\u4eec\u5f3a\u70c8\u5efa\u8bae\u60a8\u79ef\u6781\u9762\u5bf9\u5b83\u3002\u8fd9\u4e2a\u95ee\u9898\u7684\u6839\u6e90\u901a\u5e38\u4e0d\u540c\u4e8e\u4e4b\u524d\u7684Java synchronization to legitimate IO blocking\u6216\u8005\u5176\u4ed6\u7684non-thread safe calls\u3002Lock contention\u95ee\u9898\u5f80\u5f80\u662f\u53e6\u4e00\u4e2a\u95ee\u9898\u7684\u201c\u75c7\u72b6\u201d\u3002<\/p>\n<h4><strong>Java-level Deadlocks<\/strong><\/h4>\n<p>\u771f\u6b63\u7684Java-level deadlocks\u662f\u4e0d\u592a\u5e38\u89c1\u7684\uff0c\u5b83\u540c\u6837\u53ef\u4ee5\u6781\u5927\u7a0b\u5ea6\u5730\u5f71\u54cd\u5e94\u7528\u7a0b\u5e8f\u7684\u6027\u80fd\u548c\u7a33\u5b9a\u6027\u3002\u5f53\u9047\u5230\u4e24\u4e2a\u6216\u591a\u4e2a\u7ebf\u7a0b\u6c38\u8fdc\u963b\u585e\u7684\u65f6\u5019\uff0c\u5c31\u4f1a\u89e6\u53d1\u8fd9\u6837\u7684\u95ee\u9898\u3002\u8fd9\u79cd\u60c5\u51b5\u4e0d\u540c\u4e8e\u5176\u4ed6\u5e38\u89c1\u7684\u90a3\u79cd\u201cday-to-day\u201d\u7ebf\u7a0b\u95ee\u9898\uff0c\u4f8b\u5982 lock contention\u3001threads waiting on blocking IO calls\u7b49\u7b49\u3002\u771f\u6b63\u7684lock-ordering deadlock\u95ee\u9898\u53ef\u4ee5\u88ab\u770b\u505a\u5982\u4e0b\uff1a<\/p>\n<p>Oracle HotSpot \u548cIBM JVM\u4e3a\u5927\u591a\u6570\u7684deadlock detectors\u60c5\u51b5\u63d0\u4f9b\u4e86\u89e3\u51b3\u65b9\u6848\uff0c\u5e2e\u52a9\u60a8\u5feb\u901f\u627e\u51fa\u9020\u6210\u8fd9\u79cd\u72b6\u51b5\u7684\u7f6a\u9b41\u7978\u9996\u7684\u7ebf\u7a0b\u3002\u9047\u5230\u7c7b\u4f3clock contention troubleshooting\u7684\u95ee\u9898\uff0c\u5efa\u8bae\u4ece\u8bf8\u5982\u7ebf\u7a0b\u8f6c\u50a8\u5206\u6790\u4e3a\u51fa\u53d1\u70b9\u6765\u89e3\u51b3\u8be5\u95ee\u9898\u3002<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQtyOj2OF5gpjkVsibVGXgicv5Tw5A7ZTGRbDNiaVxoYDlQxEKcFJT4ZgyBw\/640?wx_fmt=jpeg&amp;wxfrom=5&amp;wx_lazy=1\" data-s=\"300,640\" data-type=\"jpeg\" data-src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQtyOj2OF5gpjkVsibVGXgicv5Tw5A7ZTGRbDNiaVxoYDlQxEKcFJT4ZgyBw\/0?wx_fmt=jpeg\" data-ratio=\"0.6125\" data-w=\"400\" \/><\/p>\n<p>\u4e00\u65e6\u627e\u5230\u9020\u6210\u95ee\u9898\u7684\u4ee3\u7801\u6839\u6e90\uff0c\u89e3\u51b3\u65b9\u6848\u6d89\u53calock-ordering\u6761\u4ef6\u5bfb\u5740\u548c\u6765\u81eaJDK\u5176\u4ed6\u53ef\u7528\u7684\u5e76\u53d1\u7f16\u7a0b\u6280\u672f\uff0c\u5982java.util.concurrent.locks.ReentrantLock\uff0c\u63d0\u4f9b\u4e86\u8bf8\u5982tryLock()\u7684\u65b9\u6cd5\u3002\u8fd9\u79cd\u65b9\u6cd5\u7ed9\u4e88\u5f00\u53d1\u4eba\u5458\u66f4\u5927\u7684\u7075\u6d3b\u6027\uff0c\u4e5f\u4e3a\u9632\u6b62deadlock\u548cthread lock \u201cstarvation\u201d\u63d0\u4f9b\u4e86\u66f4\u591a\u65b9\u5f0f\u3002<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQtmqmCaQmOHBlqvnY2lrwy6ey1N8d7puxs13AxyKfrtgpoyxTtm4MSibA\/640?wx_fmt=jpeg&amp;wxfrom=5&amp;wx_lazy=1\" data-s=\"300,640\" data-type=\"jpeg\" data-src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQtmqmCaQmOHBlqvnY2lrwy6ey1N8d7puxs13AxyKfrtgpoyxTtm4MSibA\/0?wx_fmt=jpeg\" data-ratio=\"0.53\" data-w=\"400\" \/><\/p>\n<h4><\/h4>\n<h4><strong>Clock Time\u548cCPU Burn<\/strong><\/h4>\n<p>\u5728\u8fdb\u884cJVM\u8c03\u4f18\u7684\u540c\u65f6\uff0c\u4e5f\u6709\u5fc5\u8981\u68c0\u67e5\u5e94\u7528\u7a0b\u5e8f\u7684\u884c\u4e3a\uff0c\u66f4\u786e\u5207\u5730\u8bf4\u662f\u6700\u9ad8clock time\u548cCPU burn\u7684\u8d21\u732e\u8005\u3002<\/p>\n<p>\u5f53Java\u5783\u573e\u56de\u6536\u548c\u7ebf\u7a0b\u5e76\u53d1\u4e0d\u518d\u662f\u538b\u529b\u70b9\uff0c\u6df1\u5165\u5230\u4f60\u7684\u5e94\u7528\u7a0b\u5e8f\u4ee3\u7801\u7684\u6267\u884c\u6a21\u5f0f\uff0c\u5e76\u4e13\u6ce8\u4e8e\u9876\u7ea7\u54cd\u5e94\u65f6\u95f4\u8d21\u732e\u8005\uff08\u4e5f\u53eb\u4f5cclock time\uff09\u662f\u5f88\u91cd\u8981\u7684\u3002\u68c0\u67e5\u5e94\u7528\u7a0b\u5e8f\u4ee3\u7801\u7684\u6d88CPU\u8017\u548cJava \u7ebf\u7a0b(CPU burn)\u4e5f\u540c\u6837\u81f3\u5173\u91cd\u8981\u3002CPU\u4f7f\u7528\u7387\u8f83\u9ad8\uff08\uff1e75%\uff09\u662f\u4e0d\u6b63\u5e38\u7684\uff08\u826f\u597d\u7684\u7269\u7406\u8d44\u6e90\u7684\u5229\u7528\u7387\uff09\u3002\u56e0\u4e3a\u8fd9\u5f80\u5f80\u610f\u5473\u7740\u6548\u7387\u4f4e\u4e0b\u548c\u5bb9\u91cf\u95ee\u9898\u3002\u5bf9\u4e8e\u5927\u578b\u7684Java EE\u4f01\u4e1a\u5e94\u7528\uff0c\u4fdd\u6301\u5b89\u5168\u7684CPU\u7f13\u51b2\u533a\u662f\u5fc5\u8981\u7684\uff0c\u4ee5\u5e94\u5bf9\u7a81\u53d1\u7684\u8d1f\u8f7d\u51b2\u51fb\u60c5\u51b5\u3002<\/p>\n<p>\u6452\u5f03\u90a3\u4e9b\u4f20\u7edf\u7684\u8ddf\u8e2a\u65b9\u6cd5\uff0c\u5982\u5728\u4ee3\u7801\u4e2d\u52a0\u5165\u54cd\u5e94\u65f6\u95f4\u201c\u65e5\u5fd7\u201d\u3002Java\u5256\u6790\u5de5\u5177\u548cAPM\u89e3\u51b3\u65b9\u6848\u6070\u6070\u53ef\u4ee5\u5e2e\u52a9\u60a8\u5206\u6790\u8fd9\u7c7b\u578b\u7684\u95ee\u9898\u3002\u8fd9\u79cd\u65b9\u5f0f\u66f4\u52a0\u9ad8\u6548\u3001\u53ef\u9760\u3002\u5bf9\u4e8eJava\u751f\u4ea7\u73af\u5883\u7f3a\u4e4f\u4e00\u4e2a\u5f3a\u5927\u7684APM\u89e3\u51b3\u65b9\u6848\u3002\u60a8\u4ecd\u7136\u53ef\u4ee5\u4f9d\u8d56\u8bf8\u5982Java VisualVM\u7684\u5de5\u5177\uff0c\u901a\u8fc7\u591a\u4e2a\u5feb\u7167\u8fdb\u884cthread dump\u5206\u6790\uff0c\u5e76\u4f7f\u7528OS CPU\u5206\u6790\u6bcf\u4e2a\u7ebf\u7a0b\u3002<\/p>\n<p>\u6700\u540e\u7684\u5efa\u8bae\u662f\uff0c\u4e0d\u8981\u5984\u56fe\u540c\u65f6\u89e3\u51b3\u6240\u6709\u7684\u95ee\u9898\u3002\u5217\u51fa\u6392\u5728\u6700\u524d\u9762\u76845\u4e2aclock time\u548cCPU burn\u95ee\u9898\uff0c\u7136\u540e\u5bfb\u627e\u89e3\u51b3\u65b9\u6848\u3002<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQtupQO59eVF00VhmlG82FP9606pYfNBAuBibA6LxQYxjBa1MMArBrgckw\/640?wx_fmt=jpeg&amp;wxfrom=5&amp;wx_lazy=1\" data-s=\"300,640\" data-type=\"jpeg\" data-src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQtupQO59eVF00VhmlG82FP9606pYfNBAuBibA6LxQYxjBa1MMArBrgckw\/0?wx_fmt=jpeg\" data-ratio=\"0.3920863309352518\" data-w=\"\" \/><\/p>\n<h2><\/h2>\n<h2><strong>Application\u9884\u7b97<\/strong><\/h2>\n<p>\u5176\u4ed6\u5173\u4e8eJava\u5e94\u7528\u7a0b\u5e8f\u6027\u80fd\u7684\u91cd\u8981\u65b9\u9762\u662f\u7a33\u5b9a\u6027\u548c\u53ef\u9760\u6027\u3002\u5728\u6709\u774099.9%\u5178\u578b\u53ef\u7528\u76ee\u6807\u7684SLA umbrella\u4e0b\uff0c\u7a33\u5b9a\u548c\u53ef\u9760\u5bf9\u4e8e\u7a0b\u5e8f\u7684\u64cd\u4f5c\u5c24\u4e3a\u91cd\u8981\u3002\u8fd9\u4e9b\u7cfb\u7edf\u5e94\u8be5\u5177\u6709\u9ad8\u5bb9\u9519\u7ea7\u522b\uff0c\u5e76\u5bf9\u5e94\u7528\u548c\u8d44\u6e90\u8fdb\u884c\u4e25\u683c\u7684\u9884\u7b97\uff0c\u4ee5\u9632\u6b62\u53d1\u751f\u591a\u7c73\u8bfa\u6548\u5e94\u3002\u7528\u8fd9\u79cd\u65b9\u6cd5\u53ef\u4ee5\u9632\u6b62\u4e00\u4e9b\u8fd9\u6837\u7684\u60c5\u51b5\uff0c\u4f8b\u5982\uff0c\u4e00\u4e2a\u4e1a\u52a1\u6d41\u7a0b\u4f7f\u7528\u6240\u6709\u53ef\u7528\u7684\u7269\u7406\uff0c\u4e2d\u95f4\u4ef6\u6216JVM\u8d44\u6e90\u3002<\/p>\n<h4><strong>Hot Spots<\/strong><\/h4>\n<p><img decoding=\"async\" src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQtqQr9LWOoziaf0H294dAoaDD8iaTJMHPnQNgHPK1ycsQ1SJ04xTty2jeA\/640?wx_fmt=jpeg&amp;wxfrom=5&amp;wx_lazy=1\" data-s=\"300,640\" data-type=\"jpeg\" data-src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQtqQr9LWOoziaf0H294dAoaDD8iaTJMHPnQNgHPK1ycsQ1SJ04xTty2jeA\/0?wx_fmt=jpeg\" data-ratio=\"1.1906474820143884\" data-w=\"\" \/><\/p>\n<h4><\/h4>\n<h4><strong>\u8d85\u65f6\u7ba1\u7406<\/strong><\/h4>\n<p>Java application\u4e0e\u5916\u90e8\u7cfb\u7edf\u4e4b\u95f4\u7f3a\u4e4f\u5408\u7406\u7684\u8d85\u65f6\u65f6\u95f4\uff0c\u7531\u4e8e\u4e2d\u95f4\u4ef6\u548cJVM\u7ebf\u7a0b\u6d88\u8017(blocking IO calls)\uff0c\u53ef\u80fd\u5bfc\u81f4\u4e25\u91cd\u7684\u6027\u80fd\u4e0b\u964d\u548c\u4e2d\u65ad\u3002\u5408\u7406\u7684\u8d85\u65f6\u65f6\u95f4\u53ef\u4ee5\u907f\u514d\u5728\u9047\u5230\u5916\u90e8\u670d\u52a1\u63d0\u4f9b\u5546\u901f\u5ea6\u7f13\u6162\u7684\u65f6\u5019\uff0cJava\u7ebf\u7a0b\u7b49\u5f85\u592a\u4e45\u3002<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQt2YJhETmtLictvGvTshgAic6T9BIniaPIK7iaIj0lMxdxDCibNia4TF6uokgQ\/640?wx_fmt=jpeg&amp;wxfrom=5&amp;wx_lazy=1\" data-s=\"300,640\" data-type=\"jpeg\" data-src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQt2YJhETmtLictvGvTshgAic6T9BIniaPIK7iaIj0lMxdxDCibNia4TF6uokgQ\/0?wx_fmt=jpeg\" data-ratio=\"0.460431654676259\" data-w=\"\" \/><\/p>\n<h2><\/h2>\n<h2><strong>\u5de5\u5177<\/strong><\/h2>\n<p><img decoding=\"async\" src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQttYuZAiazdEkK5xz0PtFvyPetiaKVPjOwDibAzlCFEBABwic4O0EYAuqf2g\/640?wx_fmt=png&amp;wxfrom=5&amp;wx_lazy=1\" data-s=\"300,640\" data-type=\"png\" data-src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQttYuZAiazdEkK5xz0PtFvyPetiaKVPjOwDibAzlCFEBABwic4O0EYAuqf2g\/0?wx_fmt=png\" data-ratio=\"0.8453237410071942\" data-w=\"\" \/><br \/>\n<img decoding=\"async\" src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQtSVD7hCW5hRSNs8AhESLFQoK9EUH9ichgzwJR48N3zhyrzcLlSpREoZA\/640?wx_fmt=png&amp;wxfrom=5&amp;wx_lazy=1\" data-s=\"300,640\" data-type=\"png\" data-src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQtSVD7hCW5hRSNs8AhESLFQoK9EUH9ichgzwJR48N3zhyrzcLlSpREoZA\/0?wx_fmt=png\" data-ratio=\"0.7679856115107914\" data-w=\"\" \/><br \/>\n<img decoding=\"async\" src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQtBzJTpFeiasu45iaK8tHG3wXE4LHUiajTxyaQ6kXBuyTssp135D1M1YJQg\/640?wx_fmt=png&amp;wxfrom=5&amp;wx_lazy=1\" data-s=\"300,640\" data-type=\"png\" data-src=\"http:\/\/mmbiz.qpic.cn\/mmbiz\/YOkhPCLwLC9PdhNGzBd5XfUJWzo8KkQtBzJTpFeiasu45iaK8tHG3wXE4LHUiajTxyaQ6kXBuyTssp135D1M1YJQg\/0?wx_fmt=png\" data-ratio=\"0.43345323741007197\" data-w=\"\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6765\u81ea\uff1a\u6167\u90fd\u63a7\u4ef6\u7f51 \u94fe\u63a5\uff1ahttps:\/\/www.evget.com\/article\/2016\/5\/17\/241 &hellip; <a href=\"http:\/\/blog.softwareclues.com\/zh\/java%e6%80%a7%e8%83%bd%e4%bc%98%e5%8c%96%e5%85%a8%e6%94%bb%e7%95%a5\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb<span class=\"screen-reader-text\">\u201cJava\u6027\u80fd\u4f18\u5316\u5168\u653b\u7565\u201d<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false}}},"categories":[3,49],"tags":[8,124,123],"translation":{"provider":"WPGlobus","version":"2.12.2","language":"zh","enabled_languages":["en","zh"],"languages":{"en":{"title":true,"content":true,"excerpt":false},"zh":{"title":false,"content":false,"excerpt":false}}},"jetpack_publicize_connections":[],"yoast_head":"<!-- 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