Performance Monitoring

[Caster Troy]

Hey Folks,

I have a DL580 G3 with 8GB RAM and I am planning to upgrade it to 16GB. I want to monitor the performance of the server before doing the upgrade, and after adding a further 8GB I will again monitor and see as to how much performance is improved. How can I do this? Is there any tool in Linux for monitoring performance?

[Ivan Krastev]

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regards,
ivan

[Ivan Ferreira]

There are a lot of tools, like sar, collectl, vmstat, iostat, top, free.

Depending of the system, just adding memory could not improve the performance without a related tuning, for example, database parameters.

If you don't already know the performance utilities in linux, how do you know that you need more memory? What if the performance problem is related to CPU or disk?

Also, the feedback from the end users is very important.

[skt_skt]

files under /var/log/sa are helpful.

#sar -f sa03.03202009 -A >sar.out

[smatador]

Hi,

With linux, you could also install nmon
http://www.ibm.com/developerworks/aix/library/au-analyze_aix/index.html
nmon is free and very interesting with some tools like nmon analyser. You could also put the graph on rrd
http://www.ibm.com/developerworks/wikis/display/WikiPtype/nmon

[Steven E. Protter]

Shalom,

You can port these scripts.

Command line options need work.

http://www.hpux.ws/?p=6

SEP

[Court Campbell]

I like collectl and munin.

[Taifur]

Hi caster,

You can check performance by sar command.

For details check man sar


#sar -d 1 3
#top
#vmstat
For details you can check below link,

http://linux.die.net/man/1/sar

Rgds//
Taifur

[Sivakumar MJ._1]

Use sysstat


Sysstat contains following cmds.related to collecting IO&CPU Stats.


iostat,mpstat,sadc,sa1,sar,sa2,isag,sa,


The sysstat tools should be part of every system administrator's resource monitoring tool bag.

[MarkSeger]

re sysstat - why use a bunch of tools that produce their output in a hard to read format when you can use collectl that does everything they do and much more. see http://collectl.sourceforge.net/ for details.

One of the biggest mistakes I see people make with sar is running it at the default monitoring interval of 10 minutes, which results in mush for output. Please tell me that if you do use sar you use a monitoring frequency closer to 10 seconds as that's really the only real way to see what your system is doing.

-mark