SAR command bemchmark

[Vogra]

Hi All!
where can I find "good results" about sar results to compare with my values?
Thanx.

[John Poff]

Hello Claudio,

The best "good results" you can find is from your system when it is running normally and you are having good, acceptable response times. Save those numbers and use them to compare against in the future. There are no "correct" numbers to compare against, other than what you have on your system. If you are having some specific problems with a system, you can post the problem and the numbers from 'sar' and some of the local wizards can help you figure out what might be happening.

JP

[Edward Alfert_2]

That depends on what your users find "acceptable" performance.

Take a look at 2 of my servers:

D390 with 56 users on it right now that is used for a database applications:
10:15:33 %usr %sys %wio %idle
10:15:34 7 3 7 83
10:15:35 1 0 2 97
10:15:36 6 1 12 81
10:15:37 3 1 2 94
10:15:38 1 0 9 90

Average 4 1 6 89

E55 webserver with 5 low traffic websites:
10:16:11 %usr %sys %wio %idle
10:16:12 1 0 0 99
10:16:13 0 0 0 100
10:16:14 1 3 0 96
10:16:15 0 0 0 100
10:16:16 0 0 0 100

Average 0 1 0 99

what are your numbers? remember to take them throughout the day. what are they when the activity is low? what is the maximum? do users complain of slow system? is the cpu the bottleneck or the disks?

[Sridhar Bhaskarla · Accepted solution]

Claudio,

Your question would result a very lengthy answer. There is a white paper published by HP and has been briefed up in this thread.

http://forums.itrc.hp.com/cm/QuestionAnswer/1,1150,0x4284dfe5920fd5118fef0090279cd0f9,00.html

If it's like too much to work on, you can purchase sarcheck, a good tool and it will do the logic for you in performance tuning.

-Sri

[Scott_14]

Hi there:

Check out www.sarcheck.com.

They offer a trial download to help you diag the sar results, then you can purchase it if needed.

I have to admit, from what I read off this site, it sounded good, but I have not tried it.

[alicia briggi]

Claudio,
I agree with John. Once you figure out your "normal" system results, you can use them to compare when you are experiencing problems. sar also has many different options to look at different areas of the OS. What sar option specifically were you looking at comparing? It's not good to rely on just one performance tool. I like to use glance and sar and top to compare against each other.

[Sanjay_6]

Hi Claudio,

Have a look at the threads below.

http://us-support.external.hp.com/cki/bin/doc.pl/sid=0a3ab39401f06c6c19/screen=ckiDisplayDocument?docId=200000049436468

http://us-support.external.hp.com/cki/bin/doc.pl/sid=9eb53e1c0aecfe36e3/screen=ckiDisplayDocument?docId=200000050018417

Hope this helps.

thanks

[Sanjay_6]

Hi Claudio,

Here is another thread.

http://us-support2.external.hp.com/cki/bin/doc.pl/sid=26e1f7dc1564e535a8/screen=ckiDisplayDocument?docId=200000056493259

Hope this helps too.

thanks

[Vogra]

Hi All!
very interesting the Sarcheck. I'm testing it.
thanx.