{"id":891,"date":"2017-10-20T08:19:30","date_gmt":"2017-10-20T08:19:30","guid":{"rendered":"http:\/\/www.dbafox.com\/?p=891"},"modified":"2017-10-20T08:22:48","modified_gmt":"2017-10-20T08:22:48","slug":"linux-java-high-cpu-utilization-by-threads","status":"publish","type":"post","link":"https:\/\/dbafox.com\/?p=891","title":{"rendered":"Linux &#8211; Java High cpu utilization by threads"},"content":{"rendered":"<p>[oracle@ovmm-t01 ~]$ \/u01\/app\/oracle\/java\/bin\/jps -v<\/p>\n<p>32606 Jps -Dapplication.home=\/u01\/app\/oracle\/java -Xms8m<\/p>\n<p><strong>3083<\/strong> CLIMain -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=\/u01\/app\/oracle\/ovm-manager-3\/domains\/ovm_domain\/servers\/AdminServer\/logs -Ddomain-dir=\/u01\/app\/oracle\/ovm-manager-3\/domains\/ovm_domain -Dlog4j.configuration=file:.\/log4j.properties<\/p>\n<p><strong>13774<\/strong> Server -Xms512m -Xmx4096m -XX:MaxPermSize=512m -Dweblogic.Name=AdminServer -Djava.security.policy=\/u01\/app\/oracle\/Middleware\/wlserver\/server\/lib\/weblogic.policy -Dweblogic.ProductionModeEnabled=true -DUseSunHttpHandler=true -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=\/u01\/app\/oracle\/ovm-manager-3\/domains\/ovm_domain\/servers\/AdminServer\/logs -Dorg.quartz.properties=\/u01\/app\/oracle\/ovm-manager-3\/domains\/ovm_domain\/config\/appfw\/quartz.properties -Dweblogic.security.SSL.protocolVersion=TLS1 -Dweblogic.security.disableNullCipher=true -Djava.awt.headless=true -Xdebug -Xrunjdwp:transport=dt_socket,address=127.0.0.1:8453,server=y,suspend=n -da:org.apache.myfaces.trinidad -Djava.endorsed.dirs=\/u01\/app\/oracle\/java\/jre\/lib\/endorsed:\/u01\/app\/oracle\/Middleware\/wlserver\/..\/oracle_common\/modules\/endorsed -Djava.protocol.handler.pkgs=oracle.mds.net.protocol -Dopss.version=12.1.3 -Digf.arisidbeans.carmlloc=\/u01\/app\/oracle\/ovm-manager-3\/domains\/ovm_domain\/config\/fmwconfig\/carml -Digf.arisidstack.home=\/u01\/app\/oracle\/ovm-manager-3<\/p>\n<p>&nbsp;<\/p>\n<p>Identify thread taking cpu using top command<\/p>\n<p><a href=\"http:\/\/www.dbafox.com\/wp-content\/uploads\/2017\/10\/top1.png\" rel=\"attachment wp-att-893\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-893 alignleft\" src=\"http:\/\/www.dbafox.com\/wp-content\/uploads\/2017\/10\/top1-300x208.png\" alt=\"top1\" width=\"509\" height=\"353\" srcset=\"https:\/\/dbafox.com\/wp-content\/uploads\/2017\/10\/top1-300x208.png 300w, https:\/\/dbafox.com\/wp-content\/uploads\/2017\/10\/top1.png 685w\" sizes=\"auto, (max-width: 509px) 100vw, 509px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>Get the dump trace<\/p>\n<p>\/u01\/app\/oracle\/java\/bin\/jstack 3083 &gt; jstack_3083.out<\/p>\n<p>Convert 12332 into hex = 302c<\/p>\n<p>Search for 302c in jstack_3083.out<\/p>\n<p><a href=\"http:\/\/www.dbafox.com\/wp-content\/uploads\/2017\/10\/echoshell1.png\" rel=\"attachment wp-att-894\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-894 alignleft\" src=\"http:\/\/www.dbafox.com\/wp-content\/uploads\/2017\/10\/echoshell1-300x110.png\" alt=\"echoshell1\" width=\"450\" height=\"165\" srcset=\"https:\/\/dbafox.com\/wp-content\/uploads\/2017\/10\/echoshell1-300x110.png 300w, https:\/\/dbafox.com\/wp-content\/uploads\/2017\/10\/echoshell1-768x281.png 768w, https:\/\/dbafox.com\/wp-content\/uploads\/2017\/10\/echoshell1.png 918w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>vim jstack_3083.out<\/p>\n<p>Shows that EchoShell is the thread that is taking &gt;80% cpu<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>[oracle@ovmm-t01 ~]$ \/u01\/app\/oracle\/java\/bin\/jps -v 32606 Jps -Dapplication.home=\/u01\/app\/oracle\/java -Xms8m 3083 CLIMain -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=\/u01\/app\/oracle\/ovm-manager-3\/domains\/ovm_domain\/servers\/AdminServer\/logs -Ddomain-dir=\/u01\/app\/oracle\/ovm-manager-3\/domains\/ovm_domain -Dlog4j.configuration=file:.\/log4j.properties 13774 Server -Xms512m -Xmx4096m -XX:MaxPermSize=512m -Dweblogic.Name=AdminServer -Djava.security.policy=\/u01\/app\/oracle\/Middleware\/wlserver\/server\/lib\/weblogic.policy -Dweblogic.ProductionModeEnabled=true -DUseSunHttpHandler=true -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=\/u01\/app\/oracle\/ovm-manager-3\/domains\/ovm_domain\/servers\/AdminServer\/logs -Dorg.quartz.properties=\/u01\/app\/oracle\/ovm-manager-3\/domains\/ovm_domain\/config\/appfw\/quartz.properties -Dweblogic.security.SSL.protocolVersion=TLS1 -Dweblogic.security.disableNullCipher=true -Djava.awt.headless=true -Xdebug -Xrunjdwp:transport=dt_socket,address=127.0.0.1:8453,server=y,suspend=n -da:org.apache.myfaces.trinidad -Djava.endorsed.dirs=\/u01\/app\/oracle\/java\/jre\/lib\/endorsed:\/u01\/app\/oracle\/Middleware\/wlserver\/..\/oracle_common\/modules\/endorsed -Djava.protocol.handler.pkgs=oracle.mds.net.protocol -Dopss.version=12.1.3 -Digf.arisidbeans.carmlloc=\/u01\/app\/oracle\/ovm-manager-3\/domains\/ovm_domain\/config\/fmwconfig\/carml -Digf.arisidstack.home=\/u01\/app\/oracle\/ovm-manager-3 &nbsp; Identify thread &hellip; <a href=\"https:\/\/dbafox.com\/?p=891\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"pgc_sgb_lightbox_settings":"","_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":""},"categories":[1],"tags":[],"class_list":["post-891","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Linux - Java High cpu utilization by threads - dbafox<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/dbafox.com\/?p=891\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Linux - Java High cpu utilization by threads - dbafox\" \/>\n<meta property=\"og:description\" content=\"[oracle@ovmm-t01 ~]$ \/u01\/app\/oracle\/java\/bin\/jps -v 32606 Jps -Dapplication.home=\/u01\/app\/oracle\/java -Xms8m 3083 CLIMain -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=\/u01\/app\/oracle\/ovm-manager-3\/domains\/ovm_domain\/servers\/AdminServer\/logs -Ddomain-dir=\/u01\/app\/oracle\/ovm-manager-3\/domains\/ovm_domain -Dlog4j.configuration=file:.\/log4j.properties 13774 Server -Xms512m -Xmx4096m -XX:MaxPermSize=512m -Dweblogic.Name=AdminServer -Djava.security.policy=\/u01\/app\/oracle\/Middleware\/wlserver\/server\/lib\/weblogic.policy -Dweblogic.ProductionModeEnabled=true -DUseSunHttpHandler=true -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=\/u01\/app\/oracle\/ovm-manager-3\/domains\/ovm_domain\/servers\/AdminServer\/logs -Dorg.quartz.properties=\/u01\/app\/oracle\/ovm-manager-3\/domains\/ovm_domain\/config\/appfw\/quartz.properties -Dweblogic.security.SSL.protocolVersion=TLS1 -Dweblogic.security.disableNullCipher=true -Djava.awt.headless=true -Xdebug -Xrunjdwp:transport=dt_socket,address=127.0.0.1:8453,server=y,suspend=n -da:org.apache.myfaces.trinidad -Djava.endorsed.dirs=\/u01\/app\/oracle\/java\/jre\/lib\/endorsed:\/u01\/app\/oracle\/Middleware\/wlserver\/..\/oracle_common\/modules\/endorsed -Djava.protocol.handler.pkgs=oracle.mds.net.protocol -Dopss.version=12.1.3 -Digf.arisidbeans.carmlloc=\/u01\/app\/oracle\/ovm-manager-3\/domains\/ovm_domain\/config\/fmwconfig\/carml -Digf.arisidstack.home=\/u01\/app\/oracle\/ovm-manager-3 &nbsp; 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