Monitoring process and "ps -ef" Post: 302447492

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Operating Systems AIX Monitoring process and "ps -ef" Post 302447492 by bakunin on Monday 23rd of August 2010 10:20:21 AM

08-23-2010

Registered User

Quote:

Originally Posted by Jeff-Generali

The C column indicates the cpu recently used. But I don't know the units of that C column.

To quote from Demystifying IOWAIT:

"The system contains a hardware timer which generates 100 interrupts/second. This interrupt will then dispatch the kernel scheduler process which runs at a fixed priority of 16. The scheduler will first charge the running thread with the 10 millisecond time slice and then dispatch another thread (context switch) of equal or higher priority on that CPU assuming there are other runnable threads. This short term CPU usage is reported in the “C” column when including a -l option with the ps command."

I hope this helps, although i think this disqualifies "ps -l" as a feasible source for your purposes.

Here is another link you might be interested in to read:

Process priority and control on AIX

bakunin

PS: To monitor the CPU consumption over time you might write a script which takes a snapshot of the "%CPU" value at fixed intervals and computes the actual consumption as a function over the time of the process running - some tricky calculations, but maybe worth a try.

Another idea is to run the process in question with the "time"-utility, which tells you the time spent in real-, user- and system-mode.

Last edited by bakunin; 11-01-2010 at 07:20 AM..

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LEARN ABOUT NETBSD

cpuset_clr

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