Application Performance on AIX Box Post: 302299013

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Operating Systems AIX Application Performance on AIX Box Post 302299013 by zxmaus on Thursday 19th of March 2009 03:17:07 AM

03-19-2009

Moderator

Guys,

resource usage is NOT equal to performance ... you can have a system with loads of unused memory/cpu/io and its still performing badly - because the code used is bad. And you can have a system using a very high amount of resources, that is perfectly tuned and performing just fine.

When I add an application to my system, I expect the box to use more resources (what would be shown by nmon, topas and others) but I do not necessarily expect the performance to go down.

I would suggest if you really want to know something about performance, that you run a benchmark before and after applying the application - this can be a commercial tool or just a batch you're running anyway on that box frequently. We're using a stress test batch in our company that just produces a predefined amount of work onto the box and performes certain tasks. We run it a couple of times before and after and compare the average time taken - if its similar, you don't have a performance impact, if it takes recognizable longer, you do.

Nmon is a brilliant tool to identify bottlenecks as soon as they occur but since performance is something pretty much subjective, you need something that comes close to your normal workload but needs to be measurable. Oracle and Sybase eg have such functionalities per default ...

Kind regards
zxmaus

zxmaus

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LEARN ABOUT CENTOS

pmdakvm

PMDAKVM(1)						       Performance Co-Pilot							PMDAKVM(1)

NAME

       pmdakvm - Linux virtualisation performance metrics domain agent (PMDA)

DESCRIPTION

       pmdakvm is a Performance Metrics Domain Agent (PMDA) which exports metric values from the Linux KVM virtualisation subsystem.

       Unlike many PMDAs it dynamically enumerates its metric hierarchy, based entirely on the contents of /sys/kernel/debug/kvm.

INSTALLATION

       If you want access to the names and values for the kvm performance metrics, do the following as root:

	       # cd $PCP_PMDAS_DIR/kvm
	       # ./Install

       If you want to undo the installation, do the following as root:

	       # cd $PCP_PMDAS_DIR/kvm
	       # ./Remove

       pmdakvm is launched by pmcd(1) and should never be executed directly.  The Install and Remove scripts notify pmcd(1) when the agent is
       installed or removed.

FILES

       $PCP_PMDAS_DIR/kvm/Install
	   installation script for the pmdakvm agent

       $PCP_PMDAS_DIR/kvm/Remove
	   undo installation script for the pmdakvm agent

       $PCP_LOG_DIR/pmcd/kvm.log
	   default log file for error messages from pmdakvm

SEE ALSO

       pmcd(1) and kvm(1).

3.8.10							       Performance Co-Pilot							PMDAKVM(1)