topic Re: Performance issue in Operating System - HP-UX

Performance issue

kunjuttan — Thu, 17 Dec 2009 05:59:57 GMT

What to do if the connected users are saying server performance is very slow ?

Re: Performance issue

R.K. # — Thu, 17 Dec 2009 06:04:56 GMT

HI Dipesh,

Try finding which part of server have issues.

Memory consumption
CPU usage
Disk bottleneck
Network issues
etc..

Re: Performance issue

kunjuttan — Thu, 17 Dec 2009 06:15:45 GMT

Thanks,but how to find..??

Re: Performance issue

R.K. # — Thu, 17 Dec 2009 06:26:38 GMT

More details reuired from your side:

-OS version
-model
-applicaiton running
-when did issue start
-any changes sw/hw made to server
-any other you think that can be relevant

-Please ask the users where when how they face performace issues.
-Is it specific to any file system?
-swapinfo -tam <-- to check swap usage
-top <-- to check cpu usage

Re: Performance issue

kunjuttan — Thu, 17 Dec 2009 06:47:19 GMT

Thank you Mr.RK.
But the thing is that I just want to know what all thigs is to be checked and how to, if connected users are saying server performance is very slow.

Re: Performance issue

Jeeshan — Thu, 17 Dec 2009 08:39:19 GMT

You can also check the buffer and inode usage

#sar -v 5 5

#sar -b 5 5

Re: Performance issue

kunjuttan — Fri, 18 Dec 2009 05:53:45 GMT

Can anybody give me some more details.

Re: Performance issue

R.K. # — Fri, 18 Dec 2009 07:04:36 GMT

Hi Again,

During peak usage (when users say system is slow), check swap usage (percent used):

#swapinfo -tam
The key areas to monitor are reserve, memory and total.

# dmesg
Collect system diagnostic messages to form error log.

# more /var/adm/syslog/syslog.log
Check for any Error or Warning messages

# sar -b 5 10
To check buffer cache. Typically %wcache should 95 or greater most of the time.

# sar -Mu 5 10
To check cpu load
%wio - should be less close to 0 (depends on working environment)
%idle - should be high more than 80 (depends on working environment)

Re: Performance issue

amithp — Fri, 18 Dec 2009 07:26:12 GMT

IF you have glance or GPM installed
run /opt/perf/bin/glance.

the first four rows will show you the critical metrics utilisation
viz(CPU,DISK,MEMORY,SWAP OR NETWORK).

This will give you fair idea why system is slow.

Below that it will show you the various process and resource utilistion done by them.
You can sort them as per the particular resource utilisation.

Glance have various options to drill down into the problem.

If all resources seems to be OK check with
the system load

$uptime
will show the load on the system. usually load below 1 is ok if it is 1 or more ask your users to check their applications.

Re: Performance issue

kunjuttan — Fri, 18 Dec 2009 10:34:45 GMT

"# sar -b 5 10
# sar -Mu 5 10"

Here what is this 5 and 10 means?

Re: Performance issue

Dennis Handly — Fri, 18 Dec 2009 11:59:57 GMT

># sar -b 5 10
>Here what is this 5 and 10 means?

From sar(1m):
sar [-ubdycwaqvmAMPS] [-p psetid] [-o file] t [n]
... at n intervals of t seconds.

Re: Performance issue

Viktor Balogh — Fri, 18 Dec 2009 12:58:26 GMT

>Here what is this 5 and 10 means?

a snippet from the man page of sar:

sar [-ubdycwaqvmAMPS] [-p psetid] [-o file] t [n]

sar samples cumulative activity counters in the operating system at n intervals of t seconds.

Re: Performance issue

kunjuttan — Mon, 21 Dec 2009 06:53:05 GMT

thaks ,the issue is closed.

Re: Performance issue

kunjuttan — Mon, 21 Dec 2009 06:53:21 GMT

thaks ,the issue is closed.