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 DEBIAN

bootchartd

BOOTCHARTD(1)						      General Commands Manual						     BOOTCHARTD(1)

NAME

       bootchartd - collects process information, CPU statistics and disk usage statistics

SYNOPSIS

       bootchartd [start|stop] [bootchart_init=INIT]

DESCRIPTION

       bootchartd  collects  process  information, CPU statistics and disk usage statistics from the /proc/ file system.  The accumulated log file
       may later be visualized using bootchart(1).

       bootchartd is commonly used to profile the boot process for the purpose of speeding it up.  In this case, it is started by  the	kernel	as
       the  init  process.  This is configured by adding the init=/sbin/bootchartd option to the kernel command line -- either interactively or by
       editing the bootloader's configuration file. Please refer to the documentation of your bootloader for details (e.g. lilo, grub or yaboot).

       After bootchartd is initialized during the boot process, it will start the default init process (/sbin/init) to proceed	with  the  regular
       bootup.	If, however, an alternative init process is used (e.g. (/sbin/initng), that process may be specified using the bootchart_init=INIT
       kernel command line parameter.

       Another possibility for using bootchartd is monitoring the resource usage of a specific application or the running system in  general.	In
       this case, bootchartd is started interactively by running bootchartd start and stopped using bootchartd stop.

FILES

       /var/log/bootchartd.tgz
	      default output file

       /etc/bootchartd.conf
	      default configuration file

SEE ALSO

       bootchart(1), bootchartd.conf(5)

AUTHOR

       bootchart was written by Ziga Mahkovec <ziga.mahkovec@klika.si>.

       This manual page was written by Jorg Sommer <joerg@alea.gnuu.de>, for the Debian project (but may be used by others).

								    2006-03-05							     BOOTCHARTD(1)

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