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 NETBSD

cpuset_zero

CPUSET(3)						   BSD Library Functions Manual 						 CPUSET(3)

NAME

     cpuset_create, cpuset_destroy, cpuset_zero, cpuset_set, cpuset_clr, cpuset_isset, cpuset_size -- dynamic CPU sets

SYNOPSIS

     #include <sched.h>

     cpuset_t *
     cpuset_create(void);

     void
     cpuset_destroy(cpuset_t *set);

     void
     cpuset_zero(cpuset_t *set);

     int
     cpuset_set(cpuid_t cpu, cpuset_t *set);

     int
     cpuset_clr(cpuid_t cpu, cpuset_t *set);

     int
     cpuset_isset(cpuid_t cpu, const cpuset_t *set);

     size_t
     cpuset_size(const cpuset_t *set);

DESCRIPTION

     This section describes the functions used to create, set, use and destroy the dynamic CPU sets.

     This API can be used with the POSIX threads, see pthread(3) and affinity(3).

     The ID of the primary CPU in the system is 0.

FUNCTIONS

     cpuset_create()
	      Allocates and initializes a clean CPU-set.  Returns the pointer to the CPU-set, or NULL on failure.

     cpuset_destroy(set)
	      Destroy the CPU-set specified by set.

     cpuset_zero(set)
	      Makes the CPU-set specified by set clean, that is, memory is initialized to zero bytes, and none of the CPUs set.

     cpuset_set(cpu, set)
	      Sets the CPU specified by cpu in set.  Returns zero on success, and -1 if cpu is invalid.

     cpuset_clr(cpu, set)
	      Clears the CPU specified by cpu in the CPU-set set.  Returns zero on success, and -1 if cpu is invalid.

     cpuset_isset(cpu, set)
	      Checks if CPU specified by cpu is set in the CPU-set set.  Returns the positive number if set, zero if not set, and -1 if cpu is
	      invalid.

     cpuset_size(set)
	      Returns the size in bytes of CPU-set specified by set.

SEE ALSO

     affinity(3), pset(3), sched(3), schedctl(8), kcpuset(9)

HISTORY

     The dynamic CPU sets appeared in NetBSD 5.0.

BSD
								 November 2, 2011							       BSD

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