项目是servlet，用了hibernate，redis。压力测试发现单核cpu占用300%左右。
top命令然后ps -mp 32396 -o THREAD,tid,time 发现有很多和pid32396相似的tid
大概tid都是32200-32400，每个tid占用cpu在0.7%-2.5%，然后用jstack 32396 | grep -A 100 ，各线程堆栈如
[root@localhost bin]# jstack 22887|grep 5b63 -A 100
"catalina-exec-363" daemon prio=10 tid=0x00002aaab44df800 nid=0x5b63 waiting on condition [0x000000005a2fa000]
java.lang.Thread.State: TIMED_WAITING (sleeping)
at java.lang.Thread.sleep(Native Method)
at com.dascom.wanbu.service.IWanbuService.doGet(IWanbuService.java:74)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:306)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:541)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:383)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:243)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:166)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:288)
- locked (a org.apache.tomcat.util.net.SocketWrapper)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
"catalina-exec-362" daemon prio=10 tid=0x00002aaab8092800 nid=0x5b62 waiting on condition [0x000000005a1f9000]
java.lang.Thread.State: TIMED_WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:198)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2025)
at java.util.concurrent.LinkedBlockingQueue.poll(LinkedBlockingQueue.java:424)
at org.apache.tomcat.util.threads.TaskQueue.poll(TaskQueue.java:86)
at org.apache.tomcat.util.threads.TaskQueue.poll(TaskQueue.java:32)
at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:945)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
at java.lang.Thread.run(Thread.java:662)
"catalina-exec-361" daemon prio=10 tid=0x00002aaab8091000 nid=0x5b61 runnable [0x000000005a0f7000]
java.lang.Thread.State: RUNNABLE
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(SocketInputStream.java:129)
at com.mysql.jdbc.util.ReadAheadInputStream.fill(ReadAheadInputStream.java:113)
at com.mysql.jdbc.util.ReadAheadInputStream.readFromUnderlyingStreamIfNecessary(ReadAheadInputStream.java:160)
at com.mysql.jdbc.util.ReadAheadInputStream.read(ReadAheadInputStream.java:188)
- locked (a com.mysql.jdbc.util.ReadAheadInputStream)
at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:2329)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2774)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2763)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3299)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1837)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1961)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2537)
- locked (a java.lang.Object)
at com.mysql.jdbc.ConnectionImpl.setAutoCommit(ConnectionImpl.java:4836)
- locked (a java.lang.Object)
at com.mchange.v2.c3p0.impl.NewProxyConnection.setAutoCommit(NewProxyConnection.java:1085)
- locked (a com.mchange.v2.c3p0.impl.NewProxyConnection)
at org.hibernate.connection.C3P0ConnectionProvider.getConnection(C3P0ConnectionProvider.java:83)
at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:446)
at org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:167)
at org.hibernate.jdbc.AbstractBatcher.prepareQueryStatement(AbstractBatcher.java:161)
at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1577)
at org.hibernate.loader.Loader.doQuery(Loader.java:696)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:259)
at org.hibernate.loader.Loader.doList(Loader.java:2232)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2129)
at org.hibernate.loader.Loader.list(Loader.java:2124)
at org.hibernate.loader.custom.CustomLoader.list(CustomLoader.java:312)
at org.hibernate.impl.SessionImpl.listCustomQuery(SessionImpl.java:1723)
at org.hibernate.impl.AbstractSessionImpl.list(AbstractSessionImpl.java:165)
at org.hibernate.impl.SQLQueryImpl.list(SQLQueryImpl.java:175)
at com.dascom.wanbu.Im.BaseActiveDaoIm.getGroupName(BaseActiveDaoIm.java:483)
at com.dascom.wanbu.Im.BaseActiveDaoIm.getGroupInfoByPath(BaseActiveDaoIm.java:612)
at com.dascom.wanbu.actionManager.RedisAction.GetPathByActiveIDAndGroupIDAction.GetPathByActiveIDAndGroupID(GetPathByActiveIDAndGroupIDAction.java:46)
at com.dascom.wanbu.service.BaseDataService_Dispatcher.BaseDataService_Dispatcher.ReqDataManager(BaseDataService_Dispatcher.java:86)
at com.dascom.wanbu.service.activeservice.im.ActiveRank_Service_Im.GetPathByActiveIDAndGroupID(ActiveRank_Service_Im.java:49)
at com.dascom.wanbu.service.IWanbuService.doGet(IWanbuService.java:88)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:306)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:541)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:383)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:243)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:166)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:288)
- locked (a org.apache.tomcat.util.net.SocketWrapper)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
下：，各位大神给指条明路，感谢。
系统版本 windows server 2008 R2 64位
JDK 1.8.0_162-win32
<em>Tomcat</em>-9.0.5-win32
数据库 MySQL 5.7.21-win32
32线程 32g内存
问题描述：在一台以上配置的电脑，开启一两个小时后cpu占用从0%变成18%，没有定时任务，有6个线程都占用3.11%的cpu（在其他电脑上系统版本和jdk tomcat mysql版本一样未出现该种情况）
通过jstack吧进程发现以下6个线程占用cpu，没有发现与业务代码的关联
"ajp-nio-28009-ClientPoller-1" #47 daemon prio=5 os_prio=0 tid=0x169a4000 nid=0x3e4c runnable [0x1d73f000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll0(Native Method)
at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll(WindowsSelectorImpl.java:296)
at sun.nio.ch.WindowsSelectorImpl$SubSelector.access$400(WindowsSelectorImpl.java:278)
at sun.nio.ch.WindowsSelectorImpl.doSelect(WindowsSelectorImpl.java:159)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)
- locked (a sun.nio.ch.Util$3)
- locked (a java.util.Collections$UnmodifiableSet)
- locked (a sun.nio.ch.WindowsSelectorImpl)
at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)
at org.apache.tomcat.util.net.NioEndpoint$Poller.run(NioEndpoint.java:710)
at java.lang.Thread.run(Thread.java:748)
Locked ownable synchronizers:
- None
"ajp-nio-28009-ClientPoller-0" #46 daemon prio=5 os_prio=0 tid=0x169a3c00 nid=0x81064 runnable [0x1d52f000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.WindowsSelectorImpl.resetWakeupSocket0(Native Method)
at sun.nio.ch.WindowsSelectorImpl.resetWakeupSocket(WindowsSelectorImpl.java:473)
- locked (a java.lang.Object)
at sun.nio.ch.WindowsSelectorImpl.doSelect(WindowsSelectorImpl.java:174)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)
- locked (a sun.nio.ch.Util$3)
- locked (a java.util.Collections$UnmodifiableSet)
- locked (a sun.nio.ch.WindowsSelectorImpl)
at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)
at org.apache.tomcat.util.net.NioEndpoint$Poller.run(NioEndpoint.java:710)
at java.lang.Thread.run(Thread.java:748)
Locked ownable synchronizers:
- None
"http-nio-28080-ClientPoller-0" #32 daemon prio=5 os_prio=0 tid=0x17b34400 nid=0x687dc runnable [0x1cb0f000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.WindowsSelectorImpl.resetWakeupSocket0(Native Method)
at sun.nio.ch.WindowsSelectorImpl.resetWakeupSocket(WindowsSelectorImpl.java:473)
- locked (a java.lang.Object)
at sun.nio.ch.WindowsSelectorImpl.doSelect(WindowsSelectorImpl.java:174)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)
- locked (a sun.nio.ch.Util$3)
- locked (a java.util.Collections$UnmodifiableSet)
- locked (a sun.nio.ch.WindowsSelectorImpl)
at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)
at org.apache.tomcat.util.net.NioEndpoint$Poller.run(NioEndpoint.java:710)
at java.lang.Thread.run(Thread.java:748)
Locked ownable synchronizers:
- None
"http-nio-28080-ClientPoller-1" #33 daemon prio=5 os_prio=0 tid=0x17b34800 nid=0xb3230 runnable [0x1cc5f000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.WindowsSelectorImpl.resetWakeupSocket0(Native Method)
at sun.nio.ch.WindowsSelectorImpl.resetWakeupSocket(WindowsSelectorImpl.java:473)
- locked (a java.lang.Object)
at sun.nio.ch.WindowsSelectorImpl.doSelect(WindowsSelectorImpl.java:174)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)
- locked (a sun.nio.ch.Util$3)
- locked (a java.util.Collections$UnmodifiableSet)
- locked (a sun.nio.ch.WindowsSelectorImpl)
at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)
at org.apache.tomcat.util.net.NioEndpoint$Poller.run(NioEndpoint.java:710)
at java.lang.Thread.run(Thread.java:748)
Locked ownable synchronizers:
- None
"NioBlockingSelector.BlockPoller-2" #14 daemon prio=5 os_prio=0 tid=0x15a96000 nid=0x48494 runnable [0x1669f000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll0(Native Method)
at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll(WindowsSelectorImpl.java:296)
at sun.nio.ch.WindowsSelectorImpl$SubSelector.access$400(WindowsSelectorImpl.java:278)
at sun.nio.ch.WindowsSelectorImpl.doSelect(WindowsSelectorImpl.java:159)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)
- locked (a sun.nio.ch.Util$3)
- locked (a java.util.Collections$UnmodifiableSet)
- locked (a sun.nio.ch.WindowsSelectorImpl)
at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)
at org.apache.tomcat.util.net.NioBlockingSelector$BlockPoller.run(NioBlockingSelector.java:298)
Locked ownable synchronizers:
- None
"NioBlockingSelector.BlockPoller-1" #13 daemon prio=5 os_prio=0 tid=0x15a8ec00 nid=0x8b6c8 runnable [0x1664f000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll0(Native Method)
at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll(WindowsSelectorImpl.java:296)
at sun.nio.ch.WindowsSelectorImpl$SubSelector.access$400(WindowsSelectorImpl.java:278)
at sun.nio.ch.WindowsSelectorImpl.doSelect(WindowsSelectorImpl.java:159)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)
- locked (a sun.nio.ch.Util$3)
- locked (a java.util.Collections$UnmodifiableSet)
- locked (a sun.nio.ch.WindowsSelectorImpl)
at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)
at org.apache.tomcat.util.net.NioBlockingSelector$BlockPoller.run(NioBlockingSelector.java:298)
Locked ownable synchronizers:
- None
