Problem with nmon, actual CPU usage per process Post: 302777799

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Operating Systems AIX Problem with nmon, actual CPU usage per process Post 302777799 by zaxxon on Friday 8th of March 2013 11:43:28 AM

03-08-2013

Registered User

Problem with nmon, actual CPU usage per process

Hi all,

I am currently having trouble to get nmon to print me the actual CPU usage for an interval for a process.
According to the manual, something like

Code:

# time nmon -t -C cron -s 5 -c 2 -F outfile

real    0m0.98s
user    0m0.03s
sys     0m0.04s

should print out at least the process information about cron for an interval of 2 x 5 seconds.
I tried it without specifying which process (without -C) and other parameters, but no chance. I get the very general information about everyhting else in the output, but nothing about any processes.
Also what I do not understand is, why it always runs through in much less time than I specified with -s and -c.

I am currently on AIX 6100-06-05-1115, and I am not root. Though when I call nmon to be in it's online mode and press "t", I get the top view as non-root user.

Any help is welcome. Alternatives to get the current CPU usage for a process over a specified interval is welcome.
I also tried to get the information with pprof but it seems it's showing like ps some values (ACCT_TIME) which are not working for me at all, as this seems to be the usage over time since the process was started, which is not what I am looking for. I also checked tprof, but as it looks it only works for processes that are started with it, not for processes which are already running.

In the IBM DeveloperWorks Wiki I found Nigel Griffiths' entry for a C-program to get the process information (http://www.ibm.com/developerworks/wi.../wikiptype/ryo)
He states that you have to take at least 2 measures and calculate the difference (I guess you have to bring this into relation with other processes etc. too, since the values I got did not tell me much).
I am looking for an easier way if any.

Thanks in forward!

zaxxon

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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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