linux运行jps五行结果,使用jdk的jps、jstack工具检测代码问题，提高程序性能

注&＃xff1a;这种方式尽量在并发的时候进行使用这样更容易找出代码问题。

步骤&＃xff1a;

1).进入到jdk的bin目录&＃xff0c;如图&＃xff1a;

2).使用jps工具查看tomcat的进程(如果是linux环境建议使用ps命令)&＃xff1b;

因为只安装了一个tomcat&＃xff0c;使用jps -m命令(如果安装了多个tomcat &＃xff0c;请使用jps -v命令&＃xff0c;该命令运行的结果中可以看到各个tomcat的路径)

3).执行jstack命令&＃xff0c;并把输出结果输出到日志文件&＃xff1b;

命令&＃xff1a;

[[email protected] bin]# jstack 28501 >log1.log

打开文件log1.log文件看里面内容&＃xff1a;

[[email protected] bin]# tail -200f log1.log

- locked <0x00000007058fc4b0> (a org.apache.tomcat.util.net.JIoEndpoint$Worker)

at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:484)

at java.lang.Thread.run(Thread.java:662)

"http-8090-11" daemon prio&＃61;10 tid&＃61;0x00002aaab4047000 nid&＃61;0x7181 in Object.wait() [0x000000004238b000]

java.lang.Thread.State: WAITING (on object monitor)

at java.lang.Object.wait(Native Method)

- waiting on <0x00000007056433f0> (a org.apache.tomcat.util.net.JIoEndpoint$Worker)

at java.lang.Object.wait(Object.java:485)

at org.apache.tomcat.util.net.JIoEndpoint$Worker.await(JIoEndpoint.java:458)

- locked <0x00000007056433f0> (a org.apache.tomcat.util.net.JIoEndpoint$Worker)

at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:484)

at java.lang.Thread.run(Thread.java:662)

"http-8090-10" daemon prio&＃61;10 tid&＃61;0x00002aaab46ec000 nid&＃61;0x7180 in Object.wait() [0x000000004228a000]

java.lang.Thread.State: WAITING (on object monitor)

at java.lang.Object.wait(Native Method)

- waiting on <0x0000000705643610> (a org.apache.tomcat.util.net.JIoEndpoint$Worker)

at java.lang.Object.wait(Object.java:485)

at org.apache.tomcat.util.net.JIoEndpoint$Worker.await(JIoEndpoint.java:458)

- locked <0x0000000705643610> (a org.apache.tomcat.util.net.JIoEndpoint$Worker)

at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:484)

at java.lang.Thread.run(Thread.java:662)

"http-8090-9" daemon prio&＃61;10 tid&＃61;0x00002aaab4525800 nid&＃61;0x717f in Object.wait() [0x000000004078a000]

java.lang.Thread.State: WAITING (on object monitor)

at java.lang.Object.wait(Native Method)

- waiting on <0x0000000705643898> (a org.apache.tomcat.util.net.JIoEndpoint$Worker)

at java.lang.Object.wait(Object.java:485)

at org.apache.tomcat.util.net.JIoEndpoint$Worker.await(JIoEndpoint.java:458)

- locked <0x0000000705643898> (a org.apache.tomcat.util.net.JIoEndpoint$Worker)

at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:484)

at java.lang.Thread.run(Thread.java:662)

4).日志文件进行分析

由于上面的tomcat没有进行压力测试&＃xff0c;所以看到的都是tomcat的线程没有自己程序代码的线程。因此使用前段时间的进过