在高峰时间,请求在Tomcat 8中占用太多时间

Question

在高峰时间,请求在Tomcat 8中占用太多时间

Jav*_*hir 7 java spring tomcat hibernate spring-boot

我已使用以下配置配置tomcat:

<Connector port="8080" protocol="HTTP/1.1"
           connectionTimeout="20000"
           maxThreads="500"
           maxConnections="20000"
           acceptCount="150"
           etc... />

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AJP连接器的数字相同,maxThreads=500和acceptCount="150".

它在大多数情况下工作正常,但在高峰时段,当我的请求比平时多得多时,响应时间太长.有时超过15秒,极少数情况下是timeOut.它可能看起来没问题,因为maxThreads=500我有几千个请求,但是,在服务器状态我看到:

最大线程数:500当前线程数:17当前线程忙:1保持活动套接字计数:1

currentThreadCount到目前为止我看到的最大数量是27.如果有这么多的连接,tomcat是否应该创建更多线程(最多500个)来更快地响应？

那么,我做错了什么？我错过了什么？我有2个核心CPU(高峰时段最大使用量~10%)和2GB RAM(最大使用率60%).

关于Web应用程序的简短信息:通常,每个用户每个会话至少发出2个请求:静态JSON响应和1个数据库查询.在高峰时间,我有15-20k活跃用户,但我不知道每秒有多少请求.但是,响应缓慢从5k活跃用户开始.

我还增加了app属性上的最大活动连接数,但性能没有变化,我当前的application.properties:

spring.jpa.hibernate.ddl-auto=update
spring.datasource.driverClassName=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/database_name
spring.datasource.username=$username$
spring.datasource.password=$password$
spring.datasource.tomcat.max-active=200
spring.datasource.tomcat.max-wait=10000
spring.datasource.tomcat.max-idle=50
spring.datasource.tomcat.min-idle=10
spring.datasource.tomcat.initial-size=10

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更新我将默认JDBC连接池更改Hikari为以下配置并启用了jta,但是,在高峰时间没有任何差异:

spring.jta.enabled=true
spring.datasource.hikari.maximum-pool-size=125
spring.datasource.hikari.minimum-idle=5

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I am adding database query below. Results of the query later added into another object and returned as ResponseBody.

@Query("select new ObjectClass(s.id, s.a, s.b, s.c") from TableName s " +
        "where s.x > :param order by id desc")
List<ObjectClass> getObjects(@Param("param") long param);

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CPU usage doesn't grow, RAM is almost half-free, if I am having too many requests, shouldn't I have overloaded on the server? Instead, I just get slow response time. Therefore, I think I have a configuration problem which I want to resolve.

-Xms512M -Xmx1024M

The app that hangs on peak time:

Active sessions: 3243 Session count: 475330 Max active sessions: 4685 Rejected session creations: 0 Expired sessions: 472105 Longest session alive time: 7457 s Average session alive time: 9 s Processing time: 3177 ms JSPs loaded: 0 JSPs reloaded: 0

Stack trace:

"Attach Listener" #502 daemon prio=9 os_prio=0 tid=0x00007fde58007800 nid=0x3ff waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"Abandoned connection cleanup thread" #69 daemon prio=5 os_prio=0 tid=0x00007fde6c03e800 nid=0xa44 in Object.wait() [0x00007fde471ba000]
   java.lang.Thread.State: TIMED_WAITING (on object monitor)
    at java.lang.Object.wait(Native Method)
    at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:143)
    - locked <0x00000000c259e618> (a java.lang.ref.ReferenceQueue$Lock)
    at com.mysql.jdbc.AbandonedConnectionCleanupThread.run(AbandonedConnectionCleanupThread.java:64)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)

"ajp-nio-8009-exec-25" #68 daemon prio=5 os_prio=0 tid=0x00007fde40016000 nid=0x741 waiting on condition [0x00007fde35fe0000]
   java.lang.Thread.State: TIMED_WAITING (parking)
    at sun.misc.Unsafe.park(Native Method)
    - parking to wait for  <0x00000000c1cc6758> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
    at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
    at java.util.concurrent.LinkedBlockingQueue.poll(LinkedBlockingQueue.java:467)
    at org.apache.tomcat.util.threads.TaskQueue.poll(TaskQueue.java:85)
    at org.apache.tomcat.util.threads.TaskQueue.poll(TaskQueue.java:31)
    at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1073)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:748)

"ajp-nio-8009-exec-11" #54 daemon prio=5 os_prio=0 tid=0x00007fde38041800 nid=0x733 waiting on condition [0x00007fde36fee000]
   java.lang.Thread.State: TIMED_WAITING (parking)
    at sun.misc.Unsafe.park(Native Method)
    - parking to wait for  <0x00000000c1cc6758> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
    at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
    at java.util.concurrent.LinkedBlockingQueue.poll(LinkedBlockingQueue.java:467)
    at org.apache.tomcat.util.threads.TaskQueue.poll(TaskQueue.java:85)
    at org.apache.tomcat.util.threads.TaskQueue.poll(TaskQueue.java:31)
    at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1073)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:748)

"ajp-nio-8009-AsyncTimeout" #52 daemon prio=5 os_prio=0 tid=0x00007fde884e8800 nid=0x732 waiting on condition [0x00007fde370ef000]
   java.lang.Thread.State: TIMED_WAITING (sleeping)
    at java.lang.Thread.sleep(Native Method)
    at org.apache.coyote.AbstractProtocol$AsyncTimeout.run(AbstractProtocol.java:1211)
    at java.lang.Thread.run(Thread.java:748)

"ajp-nio-8009-Acceptor-0" #51 daemon prio=5 os_prio=0 tid=0x00007fde884e6800 nid=0x731 runnable [0x00007fde371f0000]
   java.lang.Thread.State: RUNNABLE
    at sun.nio.ch.ServerSocketChannelImpl.accept0(Native Method)
    at sun.nio.ch.ServerSocketChannelImpl.accept(ServerSocketChannelImpl.java:422)
    at sun.nio.ch.ServerSocketChannelImpl.accept(ServerSocketChannelImpl.java:250)
    - locked <0x00000000c019d7e8> (a java.lang.Object)
    at org.apache.tomcat.util.net.NioEndpoint$Acceptor.run(NioEndpoint.java:455)
    at java.lang.Thread.run(Thread.java:748)

"ajp-nio-8009-ClientPoller-1" #50 daemon prio=5 os_prio=0 tid=0x00007fde884e4800 nid=0x730 runnable [0x00007fde372f1000]
   java.lang.Thread.State: RUNNABLE
    at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
    at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
    at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:93)
    at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)
    - locked <0x00000000c1da2fa0> (a sun.nio.ch.Util$3)
    - locked <0x00000000c1da2f90> (a java.util.Collections$UnmodifiableSet)
    - locked <0x00000000c1d5b1e0> (a sun.nio.ch.EPollSelectorImpl)
    at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)
    at org.apache.tomcat.util.net.NioEndpoint$Poller.run(NioEndpoint.java:787)
    at java.lang.Thread.run(Thread.java:748)

"ajp-nio-8009-ClientPoller-0" #49 daemon prio=5 os_prio=0 tid=0x00007fde884d6000 nid=0x72f runnable [0x00007fde373f2000]
   java.lang.Thread.State: RUNNABLE
    at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
    at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
    at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:93)
    at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)
    - locked <0x00000000c1d510d8> (a sun.nio.ch.Util$3)
    - locked <0x00000000c1d510c8> (a java.util.Collections$UnmodifiableSet)
    - locked <0x00000000c1ce78c0> (a sun.nio.ch.EPollSelectorImpl)
    at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)
    at org.apache.tomcat.util.net.NioEndpoint$Poller.run(NioEndpoint.java:787)
    at java.lang.Thread.run(Thread.java:748)

"ajp-nio-8009-exec-10" #48 daemon prio=5 os_prio=0 tid=0x00007fde884c7000 nid=0x72e waiting on condition [0x00007fde374f3000]
   java.lang.Thread.State: TIMED_WAITING (parking)
    at sun.misc.Unsafe.park(Native Method)
    - parking to wait for  <0x00000000c1cc6758> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
    at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
    at java.util.concurrent.LinkedBlockingQueue.poll(LinkedBlockingQueue.java:467)
    at org.apache.tomcat.util.threads.TaskQueue.poll(TaskQueue.java:85)
    at org.apache.tomcat.util.threads.TaskQueue.poll(TaskQueue.java:31)
    at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1073)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:748)

"ajp-nio-8009-exec-2" #40 daemon prio=5 os_prio=0 tid=0x00007fde884b7000 nid=0x726 waiting on condition [0x00007fde37cfb000]
   java.lang.Thread.State: TIMED_WAITING (parking)
    at sun.misc.Unsafe.park(Native Method)
    - parking to wait for  <0x00000000c1cc6758> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
    at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
    at java.util.concurrent.LinkedBlockingQueue.poll(LinkedBlockingQueue.java:467)
    at org.apache.tomcat.util.threads.TaskQueue.poll(TaskQueue.java:85)
    at org.apache.tomcat.util.threads.TaskQueue.poll(TaskQueue.java:31)
    at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1073)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:748)

"ajp-nio-8009-exec-1" #39 daemon prio=5 os_prio=0 tid=0x00007fde884b5000 nid=0x725 waiting on condition [0x00007fde37dfc000]
   java.lang.Thread.State: TIMED_WAITING (parking)
    at sun.misc.Unsafe.park(Native Method)
    - parking to wait for  <0x00000000c1cc6758> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
    at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
    at java.util.concurrent.LinkedBlockingQueue.poll(LinkedBlockingQueue.java:467)
    at org.apache.tomcat.util.threads.TaskQueue.poll(TaskQueue.java:85)
    at org.apache.tomcat.util.threads.TaskQueue.poll(TaskQueue.java:31)
    at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1073)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:748)

"http-nio-127.0.0.1-8080-AsyncTimeout" #38 daemon prio=5 os_prio=0 tid=0x00007fde884b3000 nid=0x724 waiting on condition [0x00007fde37efd000]
   java.lang.Thread.State: TIMED_WAITING (sleeping)
    at java.lang.Thread.sleep(Native Method)
    at org.apache.coyote.AbstractProtocol$AsyncTimeout.run(AbstractProtocol.java:1211)
    at java.lang.Thread.run(Thread.java:748)

"http-nio-127.0.0.1-8080-Acceptor-0" #37 daemon prio=5 os_prio=0 tid=0x00007fde884b1800 nid=0x723 runnable [0x00007fde37ffe000]
   java.lang.Thread.State: RUNNABLE
    at sun.nio.ch.ServerSocketChannelImpl.accept0(Native Method)
    at sun.nio.ch.ServerSocketChannelImpl.accept(ServerSocketChannelImpl.java:422)
    at sun.nio.ch.ServerSocketChannelImpl.accept(ServerSocketChannelImpl.java:250)
    - locked <0x00000000c01a03b8> (a java.lang.Object)
    at org.apache.tomcat.util.net.NioEndpoint$Acceptor.run(NioEndpoint.java:455)
    at java.lang.Thread.run(Thread.java:748)

"http-nio-127.0.0.1-8080-exec-1" #25 daemon prio=5 os_prio=0 tid=0x00007fde88324000 nid=0x717 waiting on condition [0x00007fde46db8000]
   java.lang.Thread.State: WAITING (parking)
    at sun.misc.Unsafe.park(Native Method)
    - parking to wait for  <0x00000000c1d9c4e0> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
    at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
    at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:103)
    at org.apache.tomcat.util.threads.TaskQueue.take(TaskQueue.java:31)
    at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:748)

"ContainerBackgroundProcessor[StandardEngine[Catalina]]" #24 daemon prio=5 os_prio=0 tid=0x00007fde88323000 nid=0x716 waiting on condition [0x00007fde476bb000]
   java.lang.Thread.State: TIMED_WAITING (sleeping)
    at java.lang.Thread.sleep(Native Method)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1355)
    at java.lang.Thread.run(Thread.java:748)

"Abandoned connection cleanup thread" #22 daemon prio=5 os_prio=0 tid=0x00007fde4ca72800 nid=0x6f5 in Object.wait() [0x00007fde45c22000]
   java.lang.Thread.State: TIMED_WAITING (on object monitor)
    at java.lang.Object.wait(Native Method)
    at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:143)
    - locked <0x00000000c102c4b0> (a java.lang.ref.ReferenceQueue$Lock)
    at com.mysql.jdbc.AbandonedConnectionCleanupThread.run(AbandonedConnectionCleanupThread.java:64)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)

"Tomcat JDBC Pool Cleaner[1595428806:1507838479700]" #21 daemon prio=5 os_prio=0 tid=0x00007fde4ca5b800 nid=0x6f4 in Object.wait() [0x00007fde470b9000]
   java.lang.Thread.State: TIMED_WAITING (on object monitor)
    at java.lang.Object.wait(Native Method)
    at java.util.TimerThread.mainLoop(Timer.java:552)
    - locked <0x00000000c0f6fe80> (a java.util.TaskQueue)
    at java.util.TimerThread.run(Timer.java:505)

"NioBlockingSelector.BlockPoller-2" #13 daemon prio=5 os_prio=0 tid=0x00007fde8847e000 nid=0x66f runnable [0x00007fde478bd000]
   java.lang.Thread.State: RUNNABLE
    at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
    at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
    at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:93)
    at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)
    - locked <0x00000000c019bd40> (a sun.nio.ch.Util$3)
    - locked <0x00000000c019bd30> (a java.util.Collections$UnmodifiableSet)
    - locked <0x00000000c019bbf8> (a sun.nio.ch.EPollSelectorImpl)
    at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)
    at org.apache.tomcat.util.net.NioBlockingSelector$BlockPoller.run(NioBlockingSelector.java:339)

"NioBlockingSelector.BlockPoller-1" #12 daemon prio=5 os_prio=0 tid=0x00007fde8846f800 nid=0x66e runnable [0x00007fde479be000]
   java.lang.Thread.State: RUNNABLE
    at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
    at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
    at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:93)
    at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)
    - locked <0x00000000c019ec10> (a sun.nio.ch.Util$3)
    - locked <0x00000000c019ec00> (a java.util.Collections$UnmodifiableSet)
    - locked <0x00000000c019ead8> (a sun.nio.ch.EPollSelectorImpl)
    at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)
    at org.apache.tomcat.util.net.NioBlockingSelector$BlockPoller.run(NioBlockingSelector.java:339)

"GC Daemon" #11 daemon prio=2 os_prio=0 tid=0x00007fde883f9000 nid=0x66b in Object.wait() [0x00007fde741c6000]
   java.lang.Thread.State: TIMED_WAITING (on object monitor)
    at java.lang.Object.wait(Native Method)
    - waiting on <0x00000000c02f16d8> (a sun.misc.GC$LatencyLock)
    at sun.misc.GC$Daemon.run(GC.java:117)
    - locked <0x00000000c02f16d8> (a sun.misc.GC$LatencyLock)

"AsyncFileHandlerWriter-1510467688" #10 daemon prio=5 os_prio=0 tid=0x00007fde88168800 nid=0x63e waiting on condition [0x00007fde7475c000]
   java.lang.Thread.State: TIMED_WAITING (parking)
    at sun.misc.Unsafe.park(Native Method)
    - parking to wait for  <0x00000000c02f16e8> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
    at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
    at java.util.concurrent.LinkedBlockingDeque.pollFirst(LinkedBlockingDeque.java:522)
    at java.util.concurrent.LinkedBlockingDeque.poll(LinkedBlockingDeque.java:684)
    at org.apache.juli.AsyncFileHandler$LoggerThread.run(AsyncFileHandler.java:160)

"Service Thread" #7 daemon prio=9 os_prio=0 tid=0x00007fde880af000 nid=0x62e runnable [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"C1 CompilerThread1" #6 daemon prio=9 os_prio=0 tid=0x00007fde880ac000 nid=0x62d waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"C2 CompilerThread0" #5 daemon prio=9 os_prio=0 tid=0x00007fde880a9000 nid=0x62c waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"Signal Dispatcher" #4 daemon prio=9 os_prio=0 tid=0x00007fde880a7000 nid=0x62b runnable [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"Finalizer" #3 daemon prio=8 os_prio=0 tid=0x00007fde88080000 nid=0x625 in Object.wait() [0x00007fde74f33000]
   java.lang.Thread.State: WAITING (on object monitor)
    at java.lang.Object.wait(Native Method)
    at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:143)
    - locked <0x00000000c02f7408> (a java.lang.ref.ReferenceQueue$Lock)
    at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:164)
    at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:209)

"Reference Handler" #2 daemon prio=10 os_prio=0 tid=0x00007fde8807b800 nid=0x622 in Object.wait() [0x00007fde75034000]
   java.lang.Thread.State: WAITING (on object monitor)
    at java.lang.Object.wait(Native Method)
    at java.lang.Object.wait(Object.java:502)
    at java.lang.ref.Reference.tryHandlePending(Reference.java:191)
    - locked <0x00000000c02f7490> (a java.lang.ref.Reference$Lock)
    at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:153)

"main" #1 prio=5 os_prio=0 tid=0x00007fde8800a800 nid=0x589 runnable [0x00007fde8f6af000]
   java.lang.Thread.State: RUNNABLE
    at java.net.PlainSocketImpl.socketAccept(Native Method)
    at java.net.AbstractPlainSocketImpl.accept(AbstractPlainSocketImpl.java:409)
    at java.net.ServerSocket.implAccept(ServerSocket.java:545)
    at java.net.ServerSocket.accept(ServerSocket.java:513)
    at org.apache.catalina.core.StandardServer.await(StandardServer.java:466)
    at org.apache.catalina.startup.Catalina.await(Catalina.java:744)
    at org.apache.catalina.startup.Catalina.start(Catalina.java:690)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:355)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:495)

"VM Thread" os_prio=0 tid=0x00007fde88073800 nid=0x5fd runnable 

"GC task thread#0 (ParallelGC)" os_prio=0 tid=0x00007fde8801f800 nid=0x597 runnable 

"GC task thread#1 (ParallelGC)" os_prio=0 tid=0x00007fde88021000 nid=0x598 runnable 

"VM Periodic Task Thread" os_prio=0 tid=0x00007fde880bd800 nid=0x62f waiting on condition 

JNI global references: 317

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更新: 虽然我还没有解决我的问题,但是@Per Huss的回答促使我朝着正确的方向分别分析每个线程并找到问题.我现在必须奖励我的赏金,因此,我将奖励给他.但是,我感谢在此发表评论的所有人,因为所有评论都帮助我学习了一些新东西.

更新2: 看起来问题是在apache中.在高峰时段,甚至静态页面的响应时间也很慢,甚至是其他应用程序的响应时间.包括tomcat经理.于是,我换prefork到mpm_worker和目前正在测试不同的配置.我很快就会用结果更新这个帖子.

Answer 1

Jav*_*hir 2

我终于解决了我的问题。事实上，是apache没有允许足够的连接。首先，我prefork改为mpm worker. 后来我又增加了数量MaxRequestWorkers。

<IfModule mpm_worker_module>
    StartServers             2
    MinSpareThreads          50
    MaxSpareThreads          125
    ThreadLimit              64
    ThreadsPerChild          25
    ServerLimit              5000
    MaxRequestWorkers        5000
    MaxConnectionsPerChild   4500

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早些时候，我已经有 3000 名活跃用户，但响应时间却很慢。使用新配置，即使有 17000 个活跃用户也不会增加响应时间，并且可以像正常情况下一样工作。正如预期的那样，CPU 使用率和 RAM 在高峰时段增加，然后恢复正常。

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