How can I get information about threads of process?

Question

I wanted to get information about the threads of a process. I used the /proc/stat command in the terminal but I get a "permission denied" error. How can I resolve this issue?

Answer 1

To get number of threads of a process, execute

grep Threads /proc/<PID>/status

Answer 2

You can display threads with ps command as well:

THREAD DISPLAY
        H     Show threads as if they were processes.
       -L     Show threads, possibly with LWP and NLWP columns.
        m     Show threads after processes.
       -m     Show threads after processes.
       -T     Show threads, possibly with SPID column.

For example:

ps -T -p $pid

to display threads with SPID number of process with PID $pid.

Answer 3

You cannot execute /proc/stat, you can view it, for example with

cat /proc/stat

/proc is a pseudo-filesystem with lots of system information to view. See man proc for details. You can read details about linux /proc/stat for example at this page