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Operating Systems
AIX
Script to identify high CPU usage processes
Post 302468815 by zxmaus on Wednesday 3rd of November 2010 10:43:04 PM
11-03-2010
Moderator
ok ok I might be a bit stupid here but what would I possibly need such a script for. Nmon percentage shows cpu% of a cpu thread - not absolute cpu. And how big such a thread is depends highly on how you did setup your virtuals ... if you have 1 virtual = one physical cpu - and only one virtual cpu in your box - than 87% might be high ... if you have 30 virtuals together worth one physical cpu, than 87% is rather low. What I would look after is rather indeed what is consuming high amounts of cpu for longer periods of time (ps aux is helpful), and do I exhaust my box regarding cpus (i.e. going constantly over my entitlement / virtual limits). Again - when I have 1 virtual cpu and 1 cpu entitled than 100% cpu is the max I can go to - if you have 30 virtuals than 30 cpus (aka 3000% is the limit). When that happens once a day for 30 sec - not a reason for concern if I am the rest of the day below 100% (aka my entitlement) 
What I would probably frequently look after is rather how my cpu is used ... high usr cpu = good, high sys cpu = bad - there are applications like sybase which are spinning cpus so the system appears to be incredibly busy - but in fact it is very busy doing nothing - and root cause is underutilization ...
Other root causes for high cpu utilization might be a bottleneck in IO or memory ... not necessarily a particular process at all.
To say it with the words of IBM : in a virtualized environment on big frames cpu is these days not your problem ... There might be at times runaway processes hogging cpu - but you will more likely capture them running nmon a few times a day interactively and just look into what is under the top cpu consumers though not expected to be.
Kind regards
zxmaus
What I would probably frequently look after is rather how my cpu is used ... high usr cpu = good, high sys cpu = bad - there are applications like sybase which are spinning cpus so the system appears to be incredibly busy - but in fact it is very busy doing nothing - and root cause is underutilization ... Other root causes for high cpu utilization might be a bottleneck in IO or memory ... not necessarily a particular process at all.
To say it with the words of IBM : in a virtualized environment on big frames cpu is these days not your problem ... There might be at times runaway processes hogging cpu - but you will more likely capture them running nmon a few times a day interactively and just look into what is under the top cpu consumers though not expected to be.
Kind regards
zxmaus
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LEARN ABOUT NETBSD
cpuset_isset
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