How to check which thread is consuming CPU?

You can identify which thread is consuming CPU in a Java process as follows:

  1. Determine the process ID (PID) of the affected server process using the following command: $ jps -v.
  2. Determine which thread in the PID identified in step 1 is consuming the CPU:

How do I identify high CPU utilization by java threads on Linux?

Press Shift + h and wait a few seconds. You can see the Show threads on message in the top console. Now, you can see thread-level details like CPU and memory utilization. You’ll notice that a java command thread with PID 7087 is utilizing 94% of the CPU.

How to check which thread is consuming CPU in linux?

you can set thread name using pthread_setname_np to set thread name and check thread name of a given time using /proc//task//status or /proc//task//stat and then check these answers calculating-cpu-usage-for-given-pid on stackoverflow to get some idea!

How do I investigate high CPU usage in java?

Basically, there are three steps:

  1. run top -H and get PID of the thread with highest CPU.
  2. convert the PID to hex.
  3. look for thread with the matching HEX PID in your thread dump.

How can I see thread usage?

To view the threads in a process with Process Explorer, select a process and open the process properties (double-click on the process or click on the Process, Properties menu item). Then click on the Threads tab. This tab shows a list of the threads in the process and three columns of information.

How do you see what a java process is doing?

You can use the jstack to connect to a running java process to get the thread dump. If you take two or more thread dumps over a period of time you can by analyzing them figure out which ones are actively using CPU. Typically the threads in the RUNNING state are the ones you need to focus on.

What is Jstack command?

The jstack command prints Java stack traces of Java threads for a specified Java process. For each Java frame, the full class name, method name, byte code index (BCI), and line number, when available, are printed.

How do I monitor java threads in Linux?

You can inspect java threads with the tool jstack . It will list the names, stacktraces and other useful information of all threads belonging to the specified process pid. Edit: The parameter nid in the thread dump of jstack is the hex version of the LWP that is displayed by top in the pid column for threads.

What is JVM CPU usage?

Shortage of memory in the Java Virtual Machine (JVM) can also reflect in high CPU usage. Instead of spending time in processing, the JVM spends more time in Garbage Collection, which in turn takes up CPU cycles. A JVM may max out on CPU usage because of the incoming workload.

How do you find which thread is taking maximum CPU in Windows?

Which Java thread is hogging the CPU?

  1. Run jstack , where pid is the process id of a Java process. The easy way to find it is to run another utility included in the JDK – jps .
  2. Search for “runnable” threads.
  3. Repeat steps 1 and 2 a couple of times and see if you can locate a pattern.

How many threads are running in Java?

Each JVM server can have a maximum of 256 threads to run Java applications.

How many threads do I have?

You can check the amount of threads you have on your CPU through using built in Windows services and tools like task manager, and system information. You can also check through manufacturer’s spec sheet, and by using some third party apps.