High CPU due to multiple Java threads accessing HashMap in GraphicImageStore ---------------------------------------------------------------------------- Key: JBSEAM-5148 URL: https://issues.jboss.org/browse/JBSEAM-5148 Project: Seam 2 Issue Type: Bug Components: Performance and Scalability Affects Versions: 2.2.2.Final Environment: Red Hat JBoss Enterprise Application Platform 5.1 Java 1.6.0.26 Java HotSpot(TM) 64-Bit Server VM (20.1-b02 mixed mode) Reporter: Suzumura Keishi High cpu and threads consuming the CPU have HashMap access at the top of the stack trace. top result is here: --- top -b -n 1 -H -p8405 8405 [Thu Jul 26 14:53:11 2018] PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND [Thu Jul 26 14:53:11 2018] 17181 jboss 25 0 5206m 4.3g 12m R 35.9 55.5 75:02.29 java [Thu Jul 26 14:53:11 2018] 17165 jboss 25 0 5206m 4.3g 12m R 33.9 55.5 68:29.77 java [Thu Jul 26 14:53:11 2018] 9854 jboss 25 0 5206m 4.3g 12m R 31.9 55.5 152:35.53 java [Thu Jul 26 14:53:11 2018] 9988 jboss 25 0 5206m 4.3g 12m R 31.9 55.5 131:00.16 java All PIDs have same stacks: --- "ajp-8009-30" daemon prio=10 tid=0x00000000570bb000 nid=0x431d runnable [0x000000004bbcb000] java.lang.Thread.State: RUNNABLE at java.util.HashMap.put(HashMap.java:374) at org.jboss.seam.ui.graphicImage.GraphicImageStore.put(GraphicImageStore.java:74) at org.jboss.seam.ui.graphicImage.GraphicImageRendererBase.doEncodeBegin(GraphicImageRendererBase.java:66) at org.jboss.seam.ui.util.cdk.RendererBase.encodeBegin(RendererBase.java:79) at javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:813) at javax.faces.component.UIComponent.encodeAll(UIComponent.java:928) at javax.faces.render.Renderer.encodeChildren(Renderer.java:148) at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:837) at javax.faces.component.UIComponent.encodeAll(UIComponent.java:930) at javax.faces.component.UIComponent.encodeAll(UIComponent.java:933) at com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:592) at org.ajax4jsf.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:100) at org.ajax4jsf.application.AjaxViewHandler.renderView(AjaxViewHandler.java:176) at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:110) at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100) at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:266) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83) -- "ajp-8009-17" daemon prio=10 tid=0x00000000a75d1800 nid=0x430d runnable [0x000000004aebe000] java.lang.Thread.State: RUNNABLE at java.util.HashMap.put(HashMap.java:374) at org.jboss.seam.ui.graphicImage.GraphicImageStore.put(GraphicImageStore.java:74) at org.jboss.seam.ui.graphicImage.GraphicImageRendererBase.doEncodeBegin(GraphicImageRendererBase.java:66) at org.jboss.seam.ui.util.cdk.RendererBase.encodeBegin(RendererBase.java:79) at javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:813) at javax.faces.component.UIComponent.encodeAll(UIComponent.java:928) at javax.faces.render.Renderer.encodeChildren(Renderer.java:148) at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:837) -- "ajp-8009-4" daemon prio=10 tid=0x00000000af787800 nid=0x2704 runnable [0x00000000496a6000] java.lang.Thread.State: RUNNABLE at java.util.HashMap.put(HashMap.java:374) at org.jboss.seam.ui.graphicImage.GraphicImageStore.put(GraphicImageStore.java:74) at org.jboss.seam.ui.graphicImage.GraphicImageRendererBase.doEncodeBegin(GraphicImageRendererBase.java:66) at org.jboss.seam.ui.util.cdk.RendererBase.encodeBegin(RendererBase.java:79) at javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:813) at javax.faces.component.UIComponent.encodeAll(UIComponent.java:928) at javax.faces.render.Renderer.encodeChildren(Renderer.java:148) at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:837) -- "ajp-8009-1" daemon prio=10 tid=0x00000000ac5ec800 nid=0x267e runnable [0x0000000048999000] java.lang.Thread.State: RUNNABLE at java.util.HashMap.put(HashMap.java:374) at org.jboss.seam.ui.graphicImage.GraphicImageStore.put(GraphicImageStore.java:74) at org.jboss.seam.ui.graphicImage.GraphicImageRendererBase.doEncodeBegin(GraphicImageRendererBase.java:66) at org.jboss.seam.ui.util.cdk.RendererBase.encodeBegin(RendererBase.java:79) at javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:813) at javax.faces.component.UIComponent.encodeAll(UIComponent.java:928) at javax.faces.render.Renderer.encodeChildren(Renderer.java:148) at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:837)