In “top” what are us, sy, ni, id, wa, hi, si and st (for CPU usage)? us – user cpu time (or) % CPU time spent in user space sy – system cpu time (or) % CPU time spent in kernel space ni – user nice cpu time (or) % CPU time spent on low … Read more
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 … Read more
The man page says what the state codes are mapped to, but not what they actually mean. From the top man page: ‘D’ = uninterruptible sleep ‘R’ = running ‘S’ = sleeping ‘T’ = traced or stopped ‘Z’ = zombie ‘R’ is the easiest; the process is ready to run, and will run whenever its … Read more
I prefer the following so I can still use top interactively without having to look up the pids each time I run it: top -p `pgrep process-name | tr “\\n” “,” | sed ‘s/,$//’` Of course if the processes change you’ll have to re-run the command. Explanation: pgrep process-name returns a list of process ids … Read more
Using pgrep to get pid’s of matching command lines: top -c -p $(pgrep -d’,’ -f string_to_match_in_cmd_line) top -p expects a comma separated list of pids so we use -d’,’ in pgrep. The -f flag in pgrep makes it match the command line instead of program name.
NetHogs is probably what you’re looking for: a small ‘net top’ tool. Instead of breaking the traffic down per protocol or per subnet, like most tools do, it groups bandwidth by process. NetHogs does not rely on a special kernel module to be loaded. If there’s suddenly a lot of network traffic, you can fire … Read more