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How can I monitor the thread count of a process on linux?

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How do I monitor threads in Linux?

The top command can show a real-time view of individual threads. To enable thread views in the top output, invoke top with "-H" option. This will list all Linux threads. You can also toggle on or off thread view mode while top is running, by pressing 'H' key.

How can I tell how many threads a process is using?

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.

What is thread count in Linux?

Because, every thread which is created in a process, there will be a respective directory created in /proc/<pid>/task, named with its thread ID. Thus, the total number of directories in /proc/<pid>/ task represents the number of threads in the process.


try

ps huH p <PID_OF_U_PROCESS> | wc -l

or htop


To get the number of threads for a given pid:

$ ps -o nlwp <pid>

Where nlwp stands for Number of Light Weight Processes (threads). Thus ps aliases nlwp to thcount, which means that

$ ps -o thcount <pid>

does also work.

If you want to monitor the thread count, simply use watch:

$ watch ps -o thcount <pid>

To get the sum of all threads running in the system:

$ ps -eo nlwp | tail -n +2 | awk '{ num_threads += $1 } END { print num_threads }'

Each thread in a process creates a directory under /proc/<pid>/task. Count the number of directories, and you have the number of threads.


cat /proc/<PROCESS_PID>/status | grep Threads

ps -eLf on the shell shall give you a list of all the threads and processes currently running on the system. Or, you can run top command then hit 'H' to toggle thread listings.


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