Command to get CPU statistics for a process

[vksingh]

Hi All,

I use mpstat to get CPU statistics in my Ubuntu 12.10 desktop.

Linux 3.6.7 (viveks) 02/01/2013 _x86_64_ (8 CPU)

13:10:08 CPU %usr %nice %sys %iowait %irq %soft %steal %guest %idle
13:10:08 all 2.37 0.19 1.01 14.54 0.00 0.02 0.00 0.00 81.86

I want to get the above CPU statistics for a process (by giving the process ID). If there is any existing command in linux then please let me know.

Thanks,
Vivek

[papibe]

Hi vksingh.

Take a look at 'ps' and 'top'.

Happy New Year!

[sanderj]

Does this help?


sander@R540:~$ top -bn1 | grep -e "PID" -e mysql
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1185 mysql 20 0 475m 3028 1356 S 0.0 0.1 1:20.01 mysqld
sander@R540:~$
sander@R540:~$ top -bn1 | grep -e "PID" -e 1185
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1185 mysql 20 0 475m 3028 1356 S 0.0 0.1 1:20.03 mysqld
sander@R540:~$

[vksingh]

Hi Sanderj,

Thanks for your response :-)

With top command, i get aggregate %CPU for a process, but I am looking for all the statistics values for the CPU like the following:
%usr %nice %sys %iowait %irq %soft %steal %guest %idle

Please tell me any command to get the results in above format.

Thanks,
Vivek

[sanderj]

I see. Out of curiosity: why do you need that info?

Did you read "man proc", especially the stuff at "/proc/[pid]/stat"?

[vksingh]

Hi Sanderj,

I checked /proc/pid/stat

I see following processor related parameters:

utime %lu Amount of time that this process has been scheduled in user mode, measured in clock ticks (divide by sysconf(_SC_CLK_TCK). This includes guest time,
guest_time (time spent running a virtual CPU, see below), so that applications that are not aware of the guest time field do not lose that time from
their calculations.

stime %lu Amount of time that this process has been scheduled in kernel mode, measured in clock ticks (divide by sysconf(_SC_CLK_TCK).

cutime %ld Amount of time that this process's waited-for children have been scheduled in user mode, measured in clock ticks (divide by sysconf(_SC_CLK_TCK). (See
also times(2).) This includes guest time, cguest_time (time spent running a virtual CPU, see below).

cstime %ld Amount of time that this process's waited-for children have been scheduled in kernel mode, measured in clock ticks (divide by sysconf(_SC_CLK_TCK).

priority %ld
(Explanation for Linux 2.6) For processes running a real-time scheduling policy (policy below; see sched_setscheduler(2)), this is the negated scheduling
priority, minus one; that is, a number in the range -2 to -100, corresponding to real-time priorities 1 to 99. For processes running under a non-real-
time scheduling policy, this is the raw nice value (setpriority(2)) as represented in the kernel. The kernel stores nice values as numbers in the range
0 (high) to 39 (low), corresponding to the user-visible nice range of -20 to 19.

Before Linux 2.6, this was a scaled value based on the scheduler weighting given to this process.

nice %ld The nice value (see setpriority(2)), a value in the range 19 (low priority) to -20 (high priority).

What is difference between priority and nice in above.

Can you help me to understand how these are related to %usr %nice %sys %iowait %irq %soft %steal %guest %idle


Thanks,
Vivek