Re: How to find the CPU usage of a process

[be-news06@lina.inka.de (Bernd Eckenfels)]

Irfan Habib <irfanhab@yahoo.com> wrote:
> I wanted to ask how can I find the cpu usage of a
> process, as opposed to runtime, with cpu usage I mean
> actually how many time slices were awarded to a
> specific process

It is accounted in seconds in usermode and kernelmode (io processing), not
in slicess.

You can use the result wof wait3(2) if you are the parent:

/usr/bin/time -v sleep 3
        Command being timed: "sleep 3"
        User time (seconds): 0.00
        System time (seconds): 0.00
        Percent of CPU this job got: 0%
        Elapsed (wall clock) time (h:mm:ss or m:ss): 0:03.00
        Average shared text size (kbytes): 0
        Average unshared data size (kbytes): 0
        Average stack size (kbytes): 0
        Average total size (kbytes): 0
        Maximum resident set size (kbytes): 0
        Average resident set size (kbytes): 0
        Major (requiring I/O) page faults: 0
        Minor (reclaiming a frame) page faults: 175
        Voluntary context switches: 2
        Involuntary context switches: 0
        Swaps: 0
        File system inputs: 0
        File system outputs: 0
        Socket messages sent: 0
        Socket messages received: 0
        Signals delivered: 0
        Page size (bytes): 4096
        Exit status: 0

You could maybe also use BSD Job Accounting.

At runtime, the /proc interface is for you. See libproc for the data you can
query. /usr/include/proc/readroc.h:

    utime,          // stat            user-mode CPU time accumulated by proces 
    stime,          // stat            kernel-mode CPU time accumulated by process

Gruss
Bernd
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