My centos server has high cpu load right now. Please see the Htop output below.
sync_supers is very suspected but I don't know how to kill it. Any suggestions?
Killing process will not get you far. I would rather recommend stop so you can inspect what is going on. By running
kill -TERM 17757
You will kill the process (notice PID column value for sync_supers may have changed since. Instead of killing immediately try doing
kill -STOP 17757
Then inspect procfs for this process ID
ls -al /proc/17757/
It will be informative to see cwd line; it says from which dir this process was started Examine also
To see how process was started
And also possibly interesting info in
ls -la /proc/17757/fd
Which will tell you if any files are opened by process.
If you want to interactively snoop on what process is doing, you can attach to it with system call tracer
strace like this
strace -p 17757
However if process is stopped, you would not see much since it's stopped, so this may be something to consider before doing anything to the process.