To get only the cpu info from the topas command terminal Post: 302888293

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Operating Systems AIX To get only the cpu info from the topas command terminal Post 302888293 by bakunin on Thursday 13th of February 2014 04:21:47 PM

02-13-2014

Registered User

Quote:

Originally Posted by rpm120

In the same way all the values such as Kern%,Wait%,Idle%,Physc and Entc from topas and sy,wa,id,pc &ec are not matching.

Infact the sample output's given were captured one after the other in the same server but the results seems to be not matching.

First, the first line of output of "vmstat" should always be ignored, as i said. Because you only have shown one line you should not use this output at all to base any assumption on it. IIRC it displays an average since last reboot or so, which is meaningless.

Second, the system is next to idle. Between 3.1% and 0% there is not much difference and the "load" could well change that much within one or two seconds (the time you needed to stop one and start the other process).

Third, both tools, "topas" and "vmstat" use a certain sampling interval, which is probably not the same per default. I use "topas" only rarely, so i could be wrong, but i believe the default sampling rate to be 2 sec. With "vmstat" there is no default, you have to provide a sampling rate (in secs). I usually start with 1 sec (my internal clock is counting that way) for intensive monitoring and (up to) 60 seconds for long-term observation.

Both, "topas" and "vmstat" get their data from the same OS interfaces, but because they treat these data differently they might end up displaying different values. I have never attempted to search for it, but i am sure you could find the OS calls both are using documented somewhere and you could write your own monitoring tool if you are determined enough. I always found that "vmstat" is giving me the data i need and in a form i can easily manipulate with the abundant UNIX text filters there are (grep, awk, sed, ksh, ....). This is why i myself use "vmstat" and hardly ever "topas": personal preference rather than technical reasons.

I hope this clears it up.

bakunin

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LEARN ABOUT DEBIAN

cpufreq-set

cpufreq-set(1)															    cpufreq-set(1)

NAME

       cpufreq-set - A small tool which allows to modify cpufreq settings.

SYNTAX

       cpufreq-set [options]

DESCRIPTION

       cpufreq-set  allows you to modify cpufreq settings without having to type e.g. "/sys/devices/system/cpu/cpu0/cpufreq/scaling_set_speed" all
       the time.

OPTIONS

       -c --cpu <CPU>
	      number of CPU where cpufreq settings shall be modified.

       -d --min <FREQ>
	      new minimum CPU frequency the governor may select.

       -u --max <FREQ>
	      new maximum CPU frequency the governor may select.

       -g --governor <GOV>
	      new cpufreq governor.

       -f --freq <FREQ>
	      specific frequency to be set. Requires userspace governor to be available and loaded.

       -r --related
	      modify all hardware-related CPUs at the same time

       -h --help
	      Prints out the help screen.

REMARKS

       Omitting the -c or --cpu argument is equivalent to setting it to zero.

       The -f FREQ, --freq FREQ parameter cannot be combined with any other parameter except the -c CPU, --cpu CPU parameter.

       FREQuencies can be passed in Hz, kHz (default), MHz, GHz, or THz by postfixing the value with the wanted unit name, without any space (fre-
       quency in kHz =^ Hz * 0.001 =^ MHz * 1000 =^ GHz * 1000000).

       On Linux kernels up to 2.6.29, the -r or --related parameter is ignored.

FILES

       /sys/devices/system/cpu/cpu*/cpufreq/
       /proc/cpufreq (deprecated)
       /proc/sys/cpu/ (deprecated)

AUTHORS

       Dominik Brodowski <linux@brodo.de> - author
       Mattia Dongili<malattia@gmail.com> - first autolibtoolization

SEE ALSO

       cpufreq-info(1), cpufreq-aperf(1)

Mattia Dongili								0.1							    cpufreq-set(1)

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