jstack java stack tracing tool 1. Introduction to jstack jstack (stack trace for java) is a stack tracing tool that comes with the Java virtual machine. jstack is mainly used to generate a thread snapshot of the current moment of the Java virtual machine. The thread snapshot is the method currently being executed by each […]
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Java thread monitoring jvisualvm and jstack
Five states of threads New: new Run: runnable Waiting: waiting (waiting indefinitely), timed waiting (waiting within a time limit) blocked: blocked End: terminated Thread conversion relationship Two monitoring methods for threads 1. Graphical interface method: jvisualvm Before monitoring, first add monitoring parameters to the jvm. In the catalina.sh file in the bin directory of tomcat, […]
[Java executable commands] (21) Thread snapshot generation tool jstack: Help developers analyze and troubleshoot thread-related problems (deadlock, infinite loop, thread blocking…)
jstack of Java executable commands 1 concept 2 Advantages and disadvantages 3 use 3.1 Syntax format 3.2 Use steps and skills 3.3 Use cases 4 Application scenarios Summarize 1 concept The jstack command is a diagnostic tool provided in the Java Development Kit (JDK) to generate thread snapshots of the Java Virtual Machine (JVM). Its […]
Linux troubleshooting java cpu too high problem, JPS, JMAP, JSTAT, JSTACK and JCMD
code: [root@localhost cpu]# cat Test.java public class Test { public static void main(String[] args) { new Thread(()->{ System.out.println(“11111″); while(true) { } },”thread1”).start(); new Thread(()->{ System.out.println(“2222″); try { Thread. sleep(100000L); } catch (InterruptedException e) { throw new RuntimeException(e); } },”thread2”).start(); new Thread(()->{ System.out.println(“33333”); try { Thread. sleep(100000L); } catch (InterruptedException e) { throw new RuntimeException(e); } […]
Use the jstack command to analyze the problem of high CPU usage
Environment Ubuntu 22.04 JDK 17.0.3.1 Introduction The jstack command prints Java stack traces of Java threads for a specified Java process Usage: jstack [-l][-e] options: -l : long listing. Prints additional information about locks -e : extended listing. Prints additional information about threads Test Java code below: package pkg1; public class Test0608 {<!– –> public […]
JVM memory analysis tools jstack, jstat, jmap
jstack, jstat, and jmap are the memory analysis tools that come with jdk, which can help us analyze the running status of heap, memory, and threads. jstack 1) View the stack information of the thread, that is, the thread snapshot at the current moment of the JVM. 2) It is mainly used to locate the […]
[Solved] [Solutions where jstack and arthas cannot be used in k8s] 1: Unable to get pid of LinuxThreads manager thread
[Solutions where jstack and arthas cannot be used in k8s] 1: Unable to get pid of LinuxThreads manager thread Using the alpine image, jstack and arthas cannot connect to the java process with pid 1 Execution result in k8s container / # jstack 1 1: Unable to get pid of LinuxThreads manager thread Solution: Startup […]