ThreadDump和Java应用诊断是怎样的-创新互联
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创新互联从2013年成立,先为天等等服务建站,天等等地企业,进行企业商务咨询服务。为天等企业网站制作PC+手机+微官网三网同步一站式服务解决您的所有建站问题。1,Solaris OS
kill -QUIT
2, HP-UX/UNIX/LinuxKill -3
PID
PID通过下面方法获取ps -efHl | grep 'java' **. **
3,Windows
直接对MSDOS窗口的程序按Ctrl-break
有些Java应用服务器是在控制台上运行,如Weblogic,为了方便获取threaddump信息,在weblogic启动的时候,最好将其标准输出重定向到一个文件,用"nohup sh startWebLogic.sh > start.log &"命令,执行"kill -3
IBM JVM下产生Thread Dump:
在AIX上用IBM的JVM,内存溢出时默认地会产生javacore文件(关于cpu的)和heapdump文件(关于内存的)。如果没有参照下列方法:
1 choose one cluster member, set the following before this server start:
在was启动前设置下面环境变量(可以加在启动脚本中)
export IBM_HEAPDUMP=true
export IBM_HEAP_DUMP=true
export IBM_HEAPDUMP_OUTOFMEMORY=true
export IBM_HEAPDUMPDIR=2 please use set command to make sure you do not have DISABLE_JAVADUMP parameter
then start this cluster member.
用set命令检查参数设置,确保没有设置DISABLE_JAVADUMP,然后启动server3 when you find free memory < 50% when no heavy access, please run kill -3
执行kill -3命令可以生成javacore文件和heapdump文件(pid为was java进程的id号,可以用ps -ef|grep java 查到),可以多执行几次,按照下面操作进行 ps -ef > psef1.txt
ps aux > psaux1.txt
vmstat 5 10 > vmstat.txt
kill -3
wait for 2 mins
kill -3
wait for 2 mins
kill -3
netstat -an> netstat2.txt
ps -ef > psef2.txt
ps aux > psaux2.txt
将上面产生的 txt 文件和/usr/WebSphere/AppServer/javacore*文件和heapdump文件拷贝到本地,然后删除这些文件,因为这些文件会占用较大的文件系统空间。
将/usr/WebSphere/AppServer/logs/wlmserver1(或2)目录下当天产生的日志拷贝出来
在IBM JVM产生的javacore或者Threaddump文件中应用服务器Web容器的常见线程状态:
Idle线程:一个已经准备好接受请求的线程,但是没有和插件或者客户端建立连接
Keep-Alive线程:是一个已经准备好接受请求的线程,并且已经和插件或者客户端建立连接
正在接受请求的线程:是一个线程正在读取request的内容或者头部
下面就给出各种线程在javacore或者Threaddump中的表现形式:
Idle线程:
"Servlet.Engine.Transports : 20" (TID:0x427F190, sys_thread_t:0x15D175E8, state:R, native ID:0xBB8) prio=5
at java.lang.Object.wait(Native Method)
at java.lang.Object.wait(Object.java:429)
at com.ibm.ws.util.BoundedBuffer.take(BoundedBuffer.java:161)
at com.ibm.ws.util.ThreadPool.getTask(ThreadPool.java(Compiled Code)) at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java(Compiled Code))
Keep-alive线程 (非SSL模式):
"Servlet.Engine.Transports : 20" (TID:0x427F190, sys_thread_t:0x15D175E8, state:R, native ID:0xBB8) prio=5
at java.net.SocketInputStream.socketRead(Native Method)
at java.net.SocketInputStream.read(SocketInputStream.java:86)
at com.ibm.ws.io.Stream.read(Stream.java)
at com.ibm.ws.io.ReadStream.readBuffer(ReadStream.java)
at com.ibm.ws.io.ReadStream.read(ReadStream.java)
at com.ibm.ws.http.HttpRequest.readRequestLine(HttpRequest.java)
at com.ibm.ws.http.HttpRequest.readRequest(HttpRequest.java)
at com.ibm.ws.http.HttpConnection.readAndHandleRequest(HttpConnection.java)
at com.ibm.ws.http.HttpConnection.run(HttpConnection.java)
at com.ibm.ws.util.CachedThread.run(ThreadPool.java)
Keep-alive线程 (SSL模式):
"Servlet.Engine.Transports : 12" (TID:0x458DBA18, sys_thread_t:0x60B297C0, state:R, native ID:0x427E) prio=5
at java.net.SocketInputStream.socketRead(Native Method)
at java.net.SocketInputStream.read(SocketInputStream.java(Compiled Code))
at com.ibm.sslite.s.a(Unknown Source)(Compiled Code)
at com.ibm.sslite.s.b(Unknown Source)(Compiled Code)
at com.ibm.sslite.s.a(Unknown Source)(Compiled Code)
at com.ibm.sslite.a.read(Unknown Source)(Compiled Code)
at com.ibm.jsse.a.read(Unknown Source)(Compiled Code)
at com.ibm.ws.io.Stream.read(Stream.java(Compiled Code))
at com.ibm.ws.io.ReadStream.readBuffer(ReadStream.java(Inlined Compiled Code))
at com.ibm.ws.io.ReadStream.read(ReadStream.java(Inlined Compiled Code))
at com.ibm.ws.http.HttpRequest.readRequestLine(HttpRequest.java(Compiled Code))
at com.ibm.ws.http.HttpRequest.readRequest(HttpRequest.java(Compiled Code))
at com.ibm.ws.http.HttpConnection.readAndHandleRequest(HttpConnection)
at com.ibm.ws.http.HttpConnection.run(HttpConnection.java(Compiled Code))
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:672)
正在接受请求的线程:
at java.net.SocketInputStream.socketRead(Native Method)
at java.net.SocketInputStream.read(SocketInputStream.java:85)
at com.ibm.ws.io.Stream.read(Stream.java:17)
at com.ibm.ws.io.ReadStream.readBuffer(ReadStream.java:411)
at com.ibm.ws.io.ReadStream.read(ReadStream.java:110)
at com.ibm.ws.http.HttpConnection.run(HttpConnection.java:448)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:672)
Sun JVM的常见线程状态:
对于thread dump信息,主要关注的是线程的状态和其执行堆栈
线程的状态一般为三类
Runnable(R):当前可以运行的线程
Waiting on monitor(CW):线程主动wait
Waiting for monitor entry(MW):线程等锁
一般关注的都是第一和第三种状态的线程
Cpu很忙则关注runnable的线程
Cpu闲则关注waiting for monitor entry的线程
一种典型的死锁是由于在server端应用(比如servlet)中请求由同一weblogic实例server的资源
解决办法就是将该servlet放到另外的执行队列里去执行
下面给出一个典型的死锁线程(注意STUCK关键字 ):
"[STUCK ] ExecuteThread: '2' for queue: 'weblogic.kernel.Default (self-tuning)'" daemon prio=10 tid=02fe9a18 nid=35 lwp_id=7518924 runnable [440dd000..440db878]
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(SocketInputStream.java:134)
at weblogic.jdbc.oracle.net8.OracleDataProvider.getArrayOfBytesFromSocket(Unknown Source)
at weblogic.jdbc.oracle.net8.OracleDataProvider.readFirstPacketInBuffer(Unknown Source)
at weblogic.jdbc.oracle.net8.OracleDataProvider.readPacket(Unknown Source)
at weblogic.jdbc.oracle.net8.OracleDataProvider.receive(Unknown Source)
at weblogic.jdbc.oracle.net8.OracleNet8NSPTDAPacket.sendRequest(Unknown Source)
at weblogic.jdbc.oracle.OracleImplStatement.fetchNext(Unknown Source)
at weblogic.jdbc.oracle.OracleImplStatement.fetchNext2(Unknown Source)
at weblogic.jdbc.oracle.OracleImplResultset.fetchAtPosition(Unknown Source)
at weblogic.jdbc.base.BaseImplResultSet.next(Unknown Source)
at weblogic.jdbc.base.BaseResultSet.next(Unknown Source)
- locked <55f25550>(a weblogic.jdbc.oracle.OracleConnection)
at weblogic.jdbc.wrapper.ResultSet_weblogic_jdbc_base_BaseResultSet.next(Unknown Source)
at org.hibernate.loader.Loader.doQuery(Loader.java:685)
UNIX/Linux下可用top、vmstat或prstat 命令观察系统资源状况
以上就是Thread Dump和Java应用诊断是怎样的,小编相信有部分知识点可能是我们日常工作会见到或用到的。希望你能通过这篇文章学到更多知识。更多详情敬请关注创新互联-成都网站建设公司行业资讯频道。
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