网站建设必须要主机吗,wordpress 移动端接口,wordpress 官网,jsp做的当当网站的文档JVM基础篇-线程运行诊断
CPU占用过多定位
用top定位哪个进程对cpu的占用过高ps H -eo pid,tid,%cpu | grep 进程id #xff08;用ps命令进一步定位是哪个线程引起的cpu占用过高#xff09;jstack 进程id 可以根据线程id 找到有问题的线程#xff0c;进一步定位到问题代码的…JVM基础篇-线程运行诊断
CPU占用过多定位
用top定位哪个进程对cpu的占用过高ps H -eo pid,tid,%cpu | grep 进程id 用ps命令进一步定位是哪个线程引起的cpu占用过高jstack 进程id 可以根据线程id 找到有问题的线程进一步定位到问题代码的源码行号
程序运行很长时间没有结果
使用jps查找java进程id使用jstack 进程id查看异常信息
示例
package com.vmware.stack;class A {}class B {}public class Demo4 {static A a new A();static B b new B();public static void main(String[] args) throws InterruptedException {new Thread(() - {synchronized (a) {try {Thread.sleep(2000);} catch (InterruptedException e) {e.printStackTrace();}synchronized (b) {System.out.println(获取了a和b);}}}).start();Thread.sleep(1000);new Thread(() - {synchronized (b) {synchronized (a) {System.out.println(获得了a和b);}}}).start();}
}jstack info
Found one Java-level deadlock:Thread-0:waiting to lock monitor 0x00007f90a8000ff0 (object 0x000000071a9cb480, a com.vmware.stack.B),which is held by Thread-1Thread-1:waiting to lock monitor 0x00007f909c000ff0 (object 0x000000071a9ca6a0, a com.vmware.stack.A),which is held by Thread-0Java stack information for the threads listed above:Thread-0:at com.vmware.stack.Demo4.lambda$main$0(Demo4.java:24)- waiting to lock 0x000000071a9cb480 (a com.vmware.stack.B)- locked 0x000000071a9ca6a0 (a com.vmware.stack.A)at com.vmware.stack.Demo4$$Lambda$14/0x0000000800c01618.run(Unknown Source)at java.lang.Thread.run(java.base17.0.6/Thread.java:833)
Thread-1:at com.vmware.stack.Demo4.lambda$main$1(Demo4.java:32)- waiting to lock 0x000000071a9ca6a0 (a com.vmware.stack.A)- locked 0x000000071a9cb480 (a com.vmware.stack.B)at com.vmware.stack.Demo4$$Lambda$17/0x0000000800c01838.run(Unknown Source)at java.lang.Thread.run(java.base17.0.6/Thread.java:833)Found 1 deadlock.
