How do you take a thread dump on a Mac?
UNIX, Mac OS X and Linux (JDK 1.4 or lower version)
- Run this command to do this: kill -QUIT
- If you are starting CQSE with the crx-quickstart/server/start script, thread dumps will be sent to crx-quickstart/server/logs/startup. Log in.
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How do I capture a thread dump?
To perform a thread dump, navigate to the console used to start the Java application and press the CTRL and Break keys at the same time. It is worth noting that on some keyboards the Pause key is not available. Therefore, in such cases, a thread dump can be captured by using the CTRL, SHIFT, and Pause keys together.
How do I get a thread dump on Windows?
Generating thread dumps on Windows
- Identify the process. Start the task manager by pressing Ctrl + Shift + Esc and look for the process ID of the Java process (Confluence).
- Run jstack to capture a single threaded dump. This command will take a thread dump of the process id, in this case the pid is 22668:
Where is the thread dump in Linux?
Performing a thread dump on UNIX (HP-UX or Sun Solaris)
- Access the system where Sterling B2B Integrator is installed.
- Change your working directory to install_dir.
- On the command line, enter cat noapp. asked.
- Enter ps -ef | grep noapp. asked.
- Enter kill -QUIT noapp. child asked
- The thread dump is placed in the file noapp.
Why do we take the thread dump?
A thread dump reveals information about an application’s thread activity that can help you diagnose problems and better optimize application and JVM performance; for example, thread dumps automatically show the occurrence of a deadlock. Deadlocks completely stop part or all of an application.
When should I get the thread dump?
You can take thread dumps whenever you see fit to analyze anything to do with thread blocking contention, deadlock detection, system resource contention. That’s why tools exist to make it easy to dump threads when we see fit, not just after a JVM crash.
How to take a thread dump in Java?
If you are having trouble dumping threads, check if this option is enabled. On UNIX, Mac OS X, and Linux, you can send a QUIT signal to the Java process to tell it to send a thread dump to standard output. You may need to run this command as sudo -u user kill -QUIT, where “user” is the user the Java process is running as.
How often should I perform a thread dump?
A thread dump is a list of all Java threads that are currently active in a Java Virtual Machine (JVM). There are several ways to take thread dumps from a JVM. It is recommended to perform more than 1 thread dump. A good practice is to perform 10 thread dumps at regular intervals (for example, one thread dump every ten seconds).
Where do I send a PID for a thread dump?
pid – Is the process ID of the application whose thread dump should be captured. When the ‘kill -3’ option is used, the thread dump is sent to the standard error stream. If you are running your application on Tomcat, the thread dump will be sent to the /logs/catalina.out file.
How do I get a thread dump on my laptop?
Now, in the console window, execute the command “Ctrl + Break”. This will generate a thread dump. A thread dump will be printed in the console window. Note 1: On several laptops (such as my Lenovo T-series) the “Pause” key is removed. In such a circumstance, you need to google to find the equivalent keys for the “Pause”.