top-command

I'm making a small Android application to show current total CPU usage like tab Performance in Windows Task Manager. I use "top -m 1 -n 1 -d 1" to get CPU usage, but i do not really understand the result of "top". The result like: User 5%, system 15%, IOW 0%, IRQ 0% User 5 + Nice 0 + Sys 14 + Idle 73 + IOW 0 + IRQ 0 + SIRQ 0 = 92 PID CPU% S #THR VSS RSS UID Name 213 11% R 1 900K 340K app_16 top CPU usage = ??? How can i calculated total CPU usage? The accepted answer for this question is incorrect. The second line of the output is the number of threads/processes that are launched in that

I would like to change the name of the ruby process that gets displayed in the linux/unix top command. I have tried the $0='miname' approach but it only works with the ps command and in top the process keeps getting displayed as "ruby" Dave Thomas had an interesting post on doing this in rails. There's nothing rails specific about the actual process name change code. He uses the $0='name' approach. When I followed his steps the name was changed in ps and top . In the post he suggests using the c keyboard command if your version of top doesn't show the short version of the command by default.

When you run "top" and see all running processes, I've always wanted to know just what everything actually means. e.g. all the various single-letter state codes for a running process (R = Running, S = Sleeping, etc...) Where can I find this? 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 turn to use the CPU comes. 'S' and 'D' are two sleep states, where the process

I am inspecting a Java process in Linux using top -H However, I cannot read the name of the thread in the "COMMAND" column (because it is too long). If I use 'c' to expand the full name of the process, then it is still to long to fit. How can I obtain the full name of the command? 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. This

I was trying to execute this command echo exec("top"); and echo exec("/usr/bin/top"); neither works (returns blank output) does anybody know why? Because top is an interactive program that is meant to be run on a terminal, not be executed from a script. You are probably want to run the 'ps' command with arguments which will sort output by cpu utilization. http://www.devdaily.com/linux/unix-linux-process-memory-sort-ps-command-cpu It probably works, but exec() doesn't return anything. Read the Manual: exec() $output = null; exec('top', $output); echo $output; But you have another problem: top