Problem with nmon, actual CPU usage per process Post: 302779107

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Operating Systems AIX Problem with nmon, actual CPU usage per process Post 302779107 by zaxxon on Tuesday 12th of March 2013 06:19:54 AM

03-12-2013

Registered User

@DGPickett

Thanks, but the options I used are valid switches I get displayed when I issue an nmon -h or if I check the man page, as well in the documentation in the IBM Wiki.

@-=Xray=-
Thanks, but tprof is for monitoring a program that you start, like sleep. I have processes that are running already and I have to check them for let's say an interval of 10 seconds and have to get their actual CPU usage for exactly this interval.
I don't want it since the process is alive (that would be regular ps) nor do I have the option to start a program.
For the explanation of -f together with -c and -s for nmon it seems to be a pity that this option is valid as it looks to me, that the output file is being written and does not get any addition 5 or 10 seconds later.
But I got your point and I think I have tried that already. I will have another look into it, but iirc, the values I got back were not that what I was looking for.

The background of all this is that I am about to write a plugin for Nagios which shall just capture the the actual CPU usage of the specified interval for a process.
Those plugins I have found do usually issue a ps and work with values that are the average since the process came to life.
When this is several days and you currently have a workload peak, you get for example just 12% CPU usage back while it is actually 77%.
So this approach is in my eyes "useless".

Maybe I explained it better now. If you have any other ideas, let me know. Thanks a lot so far for your efforts both.

Last edited by zaxxon; 03-12-2013 at 07:25 AM..

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LEARN ABOUT FREEBSD

clock_getcpuclockid

CLOCK_GETCPUCLOCKID(3)					   BSD Library Functions Manual 				    CLOCK_GETCPUCLOCKID(3)

NAME

     clock_getcpuclockid -- access a process CPU-time clock

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <time.h>

     int
     clock_getcpuclockid(pid_t pid, clockid_t *clock_id);

DESCRIPTION

     The clock_getcpuclockid() returns the clock ID of the CPU-time clock of the process specified by pid.  If the process described by pid exists
     and the calling process has permission, the clock ID of this clock will be returned in clock_id.

     If pid is zero, the clock_getcpuclockid() function returns the clock ID of the CPU-time clock of the process making the call, in clock_id.

RETURN VALUES

     Upon successful completion, clock_getcpuclockid() returns zero; otherwise, an error number is returned to indicate the error.

ERRORS

     The clock_getcpuclockid() function will fail if:

     [EPERM]		The requesting process does not have permission to access the CPU-time clock for the process.

     [ESRCH]		No process can be found corresponding to the process specified by pid.

SEE ALSO

     clock_gettime(2)

STANDARDS

     The clock_getcpuclockid() function conform to IEEE Std 1003.1-2001 (``POSIX.1'').

HISTORY

     The clock_getcpuclockid() function first appeared in FreeBSD 10.0.

AUTHORS

     David Xu <davidxu@FreeBSD.org>

BSD
								  August 21, 2012							       BSD

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