{"id":28239,"date":"2022-01-11T12:36:11","date_gmt":"2022-01-11T04:36:11","guid":{"rendered":"https:\/\/aqzt.com\/28239.html"},"modified":"2022-01-11T12:36:11","modified_gmt":"2022-01-11T04:36:11","slug":"linux%e7%b1%bb%e4%b8%bb%e6%9c%bajava%e5%ba%94%e7%94%a8%e7%a8%8b%e5%ba%8f%e5%8d%a0%e7%94%a8cpu%e3%80%81%e5%86%85%e5%ad%98%e8%bf%87%e9%ab%98%e5%88%86%e6%9e%90%e6%89%8b%e6%ae%b5","status":"publish","type":"post","link":"https:\/\/aqzt.com\/28239.html","title":{"rendered":"LINUX\u7c7b\u4e3b\u673aJAVA\u5e94\u7528\u7a0b\u5e8f\u5360\u7528CPU\u3001\u5185\u5b58\u8fc7\u9ad8\u5206\u6790\u624b\u6bb5"},"content":{"rendered":"<ol>\n<li>\u5e94\u7528\u7a0b\u5e8f\u5360\u7528\u8d44\u6e90\u9ad8\u95ee\u9898<\/li>\n<\/ol>\n<p>\u00a0<\/p>\n<\/p>\n<p>\u76ee\u524d\u5927\u90e8\u5206\u5e94\u7528\u7a0b\u5e8f\u91c7\u7528\u7684\u662fJAVA\u8bed\u8a00\u5f00\u53d1\uff0c\u5728\u4ea7\u54c1\u4e0a\u7ebf\u4f7f\u7528\u4e00\u6bb5\u65f6\u95f4\u540e\uff0c\u7ecf\u5e38\u4f1a\u51fa\u73b0\u67d0\u4e2aJAVA\u7a0b\u5e8f\u5360\u7528\u7684CPU\uff0c\u5185\u5b58\u8fc7\u9ad8\uff0c\u800c\u4e14\u51e0\u4e4e\u4ece\u4e0d\u91ca\u653e\uff0c\u5bfc\u81f4\u7cfb\u7edf\u5361\u987f\uff0c\u7528\u6237\u4f7f\u7528\u53d8\u6162\uff0c\u5982\u679c\u8981\u6062\u590d\uff0c\u5219\u5fc5\u987b\u6740\u6389\u8be5\u8fdb\u7a0b\u6216\u91cd\u542f\u8be5\u670d\u52a1\uff0c\u7136\u540e\u8fdb\u884c\u6b64\u64cd\u4f5c\u65f6\uff0c\u5fc5\u5b9a\u4f1a\u5bfc\u81f4\u4e1a\u52a1\u4e2d\u65ad\u3002<\/p>\n<p>\u00a0<\/p>\n<p>\u7a0b\u5e8f\u4e3b\u8981\u7531\u4ee3\u7801\u7ec4\u6210\uff0c\u4f18\u5316\u5219\u9700\u8981\u77e5\u9053\u662f\u54ea\u6bb5\u4ee3\u7801\u5360\u7528\u8d44\u6e90\uff0c\u5e76\u4e14\u4e00\u4e2a\u5e94\u7528\u5360\u7528CPU\u5f88\u9ad8\uff0c\u9664\u4e86\u786e\u5b9e\u662f\u8ba1\u7b97\u5bc6\u96c6\u578b\u5e94\u7528\u4e4b\u5916\uff0c\u901a\u5e38\u539f\u56e0\u90fd\u662f\u51fa\u73b0\u4e86\u6b7b\u5faa\u73af\uff0c\u6240\u4ee5\u901a\u8fc7\u4f18\u5316\u4ee3\u7801\u6765\u964d\u4f4e\u5e94\u7528\u7a0b\u5e8f\u7684\u8d44\u6e90\u6d88\u8017\u6216\u8005\u5728\u5e94\u7528\u7684\u4f7f\u7528\u8fc7\u7a0b\u4e2d\u51cf\u5c11\u6b7b\u5faa\u73af\u5219\u5fc5\u4e0d\u53ef\u5c11\u3002<\/p>\n<p>\u00a0<\/p>\n<p>\u4e0b\u9762\u6211\u4eec\u4ee54A\u5e73\u53f0\u7684\u5b57\u7b26\u7f51\u5173\u670d\u52a1\u5668\u4e3a\u4f8b\u6765\u8fdb\u884c\u76f8\u5e94\u5206\u6790\u3002<\/p>\n<p>\u00a0<\/p>\n<ol start=\"2\">\n<li>\u95ee\u9898\u5206\u6790<\/li>\n<\/ol>\n<p>\u00a0<\/p>\n<p>2.1. CPU\u8fc7\u9ad8\u5206\u6790<\/p>\n<p>\u00a0<\/p>\n<p>1\uff09\u4f7f\u7528TOP\u547d\u4ee4\u67e5\u770bCPU\u3001\u5185\u5b58\u4f7f\u7528\u72b6\u6001\u53ef\u4ee5\u53d1\u73b0CPU\u5360\u7528\u4e3b\u8981\u5206\u4e3a\u4e24\u90e8\u5206\uff0c\u4e00\u90e8\u5206\u4e3a\u7cfb\u7edf\u5185\u6838\u7a7a\u95f4\u5360\u7528CPU\u767e\u5206\u6bd4\uff0c\u4e00\u90e8\u5206\u4e3a\u7528\u6237\u7a7a\u95f4\u5360\u7528CPU\u767e\u5206\u6bd4\u3002\u5176\u4e2dCPU\u72b6\u6001\u4e2d\u6807\u793aid\u7684\u4e3a\u7a7a\u95f2CPU\u767e\u5206\u6bd4\u3002\u5f53\u7a7a\u95f2CPU\u767e\u5206\u6bd4\u8d8a\u4f4e\uff0c\u8bf4\u660eCPU\u5360\u7528\u7387\u8d8a\u9ad8\u3002<\/p>\n<p>\u00a0<\/p>\n<p>2\uff09\u521d\u6b65\u5206\u6790\u53ef\u4ee5\u53d1\u73b0\u5176\u4e2d\u4e3b\u8981\u5360\u7528CPU\u7684\u8fdb\u7a0b\u4e3ajava\u5b50\u8fdb\u7a0bjerrySsh\u670d\u52a1\uff08\u7528\u6237\u8bbf\u95ee\u8d44\u6e90\u4f7f\u7528\u7684\u76d1\u542c\u670d\u52a1\uff09\uff0c\u5728\u7528\u6237\u91cf\u4e0d\u5927\u7684\u60c5\u51b5\u4e0b\uff0cCPU\u6d88\u8017\u8d44\u6e90\u5f88\u5927\u3002\u6839\u636e\u7814\u53d1\u53cd\u9988\u5b57\u7b26\u7f51\u5173\u8bbe\u5b9a\u7684\u6700\u5927\u8bbf\u95ee\u91cf\u53ef\u8fbe\u5230500\/\u53f0\uff0c\u76ee\u524d\u5b57\u7b26\u7f51\u5173\u7684\u8d44\u6e90\u4f7f\u7528\u73b0\u72b6\u65e0\u6cd5\u6ee1\u8db3\u8bbe\u5b9a\u7684\u8981\u6c42\u3002<\/p>\n<p>\u00a0<\/p>\n<p>\u25cf \u5206\u6790\u624b\u6bb5<\/p>\n<p>\u00a0<\/p>\n<p>\u76ee\u524d\u9488\u5bf9Linux\u4e0bjava\u8fdb\u7a0b\u5360\u7528CPU\u9ad8\u7684\u5206\u6790\u624b\u6bb5\u4e3b\u8981\u4e3a\u4f7f\u7528linux\u547d\u4ee4\u67e5\u51fa\u9ad8CPU\u4f7f\u7528\u7684\u8fdb\u7a0b\uff0c\u524d\u5206\u6790\u5176\u662f\u7531\u4e8e\u8fdb\u7a0b\u539f\u56e0\u8fd8\u662f\u7cfb\u7edf\u539f\u56e0\uff0c\u5728\u5206\u6790\u51fa\u4e3a\u8fdb\u7a0b\u6d88\u8017\u8fc7\u9ad8CPU\u540e\u5217\u51fa\u5360\u7528CPU\u9ad8\u548c\u5360\u7528\u65f6\u95f4\u6700\u957f\u7684\u7ebf\u7a0b\u5e76\u4f7f\u7528jdk\u81ea\u5e26\u7684jstack\u5de5\u5177\u8fdb\u884c\u5206\u6790CPU\u4f7f\u7528\u5206\u6790\uff1a<\/p>\n<p>export JAVA_HOME=\/usr\/apps\/java\/jdk1.6.0_20\/<\/p>\n<p>export PATH=$JAVA_HOME\/bin:$PATH<\/p>\n<p>export CLASSPATH=.:$JAVA_HOME\/lib\/dt.jar:$JAVA_HOME\/lib\/tools.jar<\/p>\n<p>\u00a0<\/p>\n<p>\u5206\u6790\u8fc7\u7a0b\uff1a<\/p>\n<ol>\n<li><\/li>\n<\/ol>\n<p>\u6839\u636etop\u547d\u4ee4\uff0c\u53d1\u73b0PID\u4e3a13033\u7684Java\u8fdb\u7a0b\u5360\u7528CPU %id 50%\u4ee5\u4e0a\uff0c\u5360\u7528CPU\u8fc7\u9ad8<\/p>\n<ol>\n<li><\/li>\n<\/ol>\n<p>\u627e\u5230\u8be5\u8fdb\u7a0b\u540e\uff0c\u9996\u5148\u663e\u793a\u7ebf\u7a0b\u5217\u8868,\u5e76\u6309\u7167CPU\u5360\u7528\u9ad8\u7684\u7ebf\u7a0b\u6392\u5e8f\uff1a<\/p>\n<ol>\n<li><\/li>\n<\/ol>\n<p>[root@YZ-A-ZFWG-4 ~]# ps -mp 13033 -o THREAD,tid,time | sort \u2013rn<\/p>\n<p>\u00a0<\/p>\n<p>\u663e\u793a\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/aqzt.com\/wp-content\/uploads\/20220223054931-67.jpg\" alt=\"\" \/><br \/>\n<!-- -->\u627e\u5230\u4e86\u8017\u65f6\u6700\u9ad8\u7684\u7ebf\u7a0b28358\uff0c\u5360\u7528CPU\u65f6\u95f4\u8fbe8\u5206\u591a\u949f\u3002<br \/>\n\u5c06\u9700\u8981\u7684\u7ebf\u7a0bID\u8f6c\u6362\u4e3a16\u8fdb\u5236\u683c\u5f0f\uff1a<\/p>\n<p>[root@YZ-A-ZFWG-4 ~]# printf &quot;%x\\n&quot; 28358<\/p>\n<p>6ec6<\/p>\n<p>\u6700\u540e\u6253\u5370\u7ebf\u7a0b\u7684\u5806\u6808\u4fe1\u606f\uff1a<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/aqzt.com\/wp-content\/uploads\/20220223054931-22.jpg\" alt=\"\" \/><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/aqzt.com\/wp-content\/uploads\/20220223054932-14.jpg\" alt=\"\" \/><br \/>\n<!-- -->\u7ecf\u6bd4\u5bf9\u53d1\u73b0\u5360\u7528CPU\u9ad8\u7684jerrySsh\u670d\u52a1\u4e2d\u9ad8\u6d88\u8017CPU\u7684\u4ee3\u7801\u5747\u4e3a\u4e00\u4e9b\u7b49\u5f85\u548c\u8bfb\u53d6\u7684\u8bed\u53e5\u3002<br \/>\n\u5185\u6838\u65f6\u95f4\u5360\u7528\u6700\u957f\u7684\u7ebf\u7a0b\u6240\u4f7f\u7528\u7684\u4ee3\u7801\u6293\u53d6\uff1a<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/aqzt.com\/wp-content\/uploads\/20220223054933-61.png\" alt=\"\" \/><br \/>\n<!-- -->2.2. \u5185\u5b58\u4f7f\u7528\u5206\u6790<\/p>\n<p>\u00a0<\/p>\n<p>\u76ee\u524d\u5b57\u7b26\u7f51\u5173\u5185\u5b58\u4f7f\u7528\u8d8b\u4e8e\u5e73\u8861\uff0c\u9664\u5076\u5c14\u51fa\u73b0close_wait\u8fde\u63a5\u540e\u7531\u4e8e\u672a\u80fd\u5f97\u5230\u53ca\u65f6\u91ca\u653e\u800c\u5360\u7528\u4e86\u5927\u91cf\u5185\u5b58\u5bfc\u81f4buffers\/cache\u8f83\u5c0f\u5916\uff0c\u5176\u4ed6\u7ebf\u6761\u6682\u672a\u51fa\u73b0\u95ee\u9898\uff0c\u636e\u7814\u53d1\u53cd\u9988\u5df2\u7ecf\u505a\u8fc7\u4f18\u5316\uff0c\u4f46\u662f\u4ece\u76ee\u524d\u89c2\u5bdf\u6765\u770bcoles_wait\u8fde\u63a5\u91ca\u653e\u65f6\u95f4\u7a0d\u957f\u3002\u5e76\u4e14\u7531\u4e8ebuffers\u3001cached\u91ca\u653e\u4e0d\u51fa\u6765\uff0c\u5bfc\u81f4\u7cfb\u7edf\u5269\u4f59\u7269\u7406\u5185\u5b58\u8f83\u5c0f\uff0c\u53ef\u80fd\u4f1a\u5f71\u54cd\u7cfb\u7edf\u6027\u80fd\uff0c\u4e3a\u4e86\u5f7b\u5e95\u89e3\u51b3\u6b64\u7c7b\u95ee\u9898\uff0c\u6240\u4ee5\u6211\u4eec\u505a\u4e86\u4ee5\u4e0b\u5206\u6790\uff1a<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/aqzt.com\/wp-content\/uploads\/20220223054934-87.png\" alt=\"\" \/><br \/>\n<!-- -->\u5728linux\u7684\u5185\u5b58\u5206\u914d\u673a\u5236\u4e2d\uff0c\u7cfb\u7edf\u4f18\u5148\u4f7f\u7528\u7269\u7406\u5185\u5b58\uff0c\u5f53\u7269\u7406\u5185\u5b58\u8fd8\u6709\u7a7a\u95f2\uff0c\u8868\u793a\u8fd8\u591f\u7528\u65f6\uff0c\u4e0d\u4f1a\u91ca\u653e\u5176\u5360\u7528\u5185\u5b58\uff0c\u5373\u4f7f\u5360\u7528\u5185\u5b58\u7684\u7a0b\u5e8f\u5df2\u7ecf\u88ab\u5173\u95ed\u4e86\uff0c\u8be5\u7a0b\u5e8f\u6240\u5360\u7528\u7684\u5185\u5b58\u7528\u6765\u505a\u7f13\u5b58\u4f7f\u7528\uff0c\u5bf9\u4e8e\u5f00\u542f\u8fc7\u7684\u7a0b\u5e8f\u3001\u6216\u662f\u8bfb\u53d6\u521a\u5b58\u53d6\u8fc7\u5f97\u6570\u636e\u4f1a\u6bd4\u8f83\u5feb\uff0c\u56e0\u6b64\u67e5\u770b\u76ee\u524d\u8fdb\u7a0b\u6b63\u5728\u5b9e\u9645\u88ab\u4f7f\u7528\u7684\u5185\u5b58\uff08used-buffers-cache\uff09\uff0c\u4e5f\u53ef\u4ee5\u8ba4\u4e3a\u5982\u679c\u4ea4\u6362\u5206\u533a\uff08swap\uff09\u6ca1\u6709\u5927\u91cf\u4f7f\u7528\uff0c\u7269\u7406\u5185\u5b58\uff08mem\uff09\u8fd8\u662f\u591f\u7528\u7684\uff0c\u53ea\u6709\u7269\u7406\u5185\u5b58\uff08mem\uff09\u88ab\u5f53\u524d\u8fdb\u7a0b\u5b9e\u9645\u5360\u7528\u5b8c\uff08\u6ca1\u6709\u4e86buffers\u548ccache\uff09\uff0c\u624d\u4f1a\u4f7f\u7528\u5230\u4ea4\u6362\u5206\u533a\uff08swap\uff09\u3002<\/p>\n<p>\u00a0<\/p>\n<p>\u4f46\u662f\u4ece\u4ee3\u7801\u7684\u89d2\u5ea6\uff0c\u76ee\u524d\u7814\u53d1\u4eba\u5458\u4e3b\u8981\u5173\u6ce8java.lang.OutOfMemoryError: Java heap space\u5f02\u5e38\uff0c\u51cf\u5c11\u4e0d\u5fc5\u8981\u7684\u5bf9\u8c61\u521b\u5efa\uff0c\u540c\u65f6\u907f\u514d\u5185\u5b58\u6cc4\u6f0f\uff0c\u6240\u4ee5\u5206\u6790\u4ee3\u7801\u624d\u662f\u6211\u4eec\u63a5\u4e0b\u6765\u8981\u505a\u7684\u4e3b\u8981\u5de5\u4f5c\uff1b\u4ee5\u4e0b\u4e3a\u5b57\u7b26\u7f51\u5173\u5206\u6790\u5185\u5b58\u5360\u7528\u7684\u6545\u969c\u6392\u67e5\u8fc7\u7a0b\uff1a<\/p>\n<p>\u00a0<\/p>\n<p>\u25cf \u5206\u6790\u624b\u6bb5<\/p>\n<ol>\n<li>\n<p>top\u547d\u4ee4\uff1aLinux\u547d\u4ee4\u3002\u53ef\u4ee5\u67e5\u770b\u5b9e\u65f6\u7684\u5185\u5b58\u4f7f\u7528\u60c5\u51b5\u3002 \u00a0<\/p>\n<\/li>\n<li>\n<p>jmap -histo:live [pid]\uff0c\u7136\u540e\u5206\u6790\u5177\u4f53\u7684\u5bf9\u8c61\u6570\u76ee\u548c\u5360\u7528\u5185\u5b58\u5927\u5c0f\uff0c\u4ece\u800c\u5b9a\u4f4d\u4ee3\u7801\u3002<\/p>\n<\/li>\n<li>\n<p>jmap -dump:live,format=b,file=xxx.xxx [pid]\uff0c\u7136\u540e\u5229\u7528MAT\u5de5\u5177\u5206\u6790\u662f\u5426\u5b58\u5728\u5185\u5b58\u6cc4\u6f0f\u3002<\/p>\n<\/li>\n<\/ol>\n<p>\u00a0<\/p>\n<p>Java\u63d0\u4f9b\u4e86\u4e00\u4e2a\u5f88\u597d\u7684\u5185\u5b58\u76d1\u63a7\u5de5\u5177\uff1ajmap\u547d\u4ee4<\/p>\n<p>jmap\u547d\u4ee4\u6709\u4e0b\u9762\u51e0\u79cd\u5e38\u7528\u7684\u7528\u6cd5\uff1a<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/aqzt.com\/wp-content\/uploads\/20220223054935-53.png\" alt=\"\" \/><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/aqzt.com\/wp-content\/uploads\/20220223054936-18.jpg\" alt=\"\" \/><br \/>\n<!-- -->\u4ece\u4e0a\u8ff0\u6253\u5370\u7684\u65e5\u5fd7\u53ef\u4ee5\u5f97\u77e5\u8be5\u8fdb\u7a0b\u8c03\u7cfb\u7edf\u8fdb\u7a0b\u5360\u7528\u5185\u5b58\u7684\u4e3b\u8981\u7a0b\u5e8f\u3002<\/p>\n<p>\u4f7f\u7528.\/jmap -histo:live 14978\u67e5\u8be2\u5f53\u524d Java\u8fdb\u7a0b\u521b\u5efa\u7684\u6d3b\u8dc3\u5bf9\u8c61\u6570\u76ee\u548c\u5360\u7528\u5185\u5b58\u5927\u5c0f\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/aqzt.com\/wp-content\/uploads\/20220223054936-36.png\" alt=\"\" \/><br \/>\n<!-- -->\u53ef\u4ee5\u65e5\u5fd7\u4e2d\u53d1\u73b0constMethodKlass\u3001methodKlass\u3001symbolKlass\u90fd\u5360\u7528\u4e86\u5927\u91cf\u7684\u5185\u5b58\uff0c\u7279\u522b\u662f\u5360\u7528\u4e86\u5927\u91cf\u5185\u5b58\u7684int\u6570\u7ec4\uff0c\u9700\u8981\u4ed4\u7ec6\u68c0\u67e5\u76f8\u5173\u4ee3\u7801\uff0c\u63a5\u4e0b\u6765\u8fd9\u4e9b\u4e8b\u5c31\u53ef\u4ee5\u4e22\u7ed9\u7814\u53d1\u4e86\u3002<\/p>\n<p>\u00a0<\/p>\n<ol start=\"3\">\n<li>\u603b\u7ed3\u5206\u6790\u624b\u6bb5<\/li>\n<\/ol>\n<p>\u00a0<\/p>\n<p>\u25cf \u5206\u6790CPU\u5360\u7528\u7684\u65b9\u6cd5\u548c\u624b\u6bb5\uff1a<\/p>\n<ol>\n<li>\n<p>top\u547d\u4ee4\uff1a\u53ef\u4ee5\u67e5\u770b\u5b9e\u65f6\u7684CPU\u4f7f\u7528\u60c5\u51b5\u3002<\/p>\n<\/li>\n<li>\n<p>ps 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