Experimenting a bottleneck

[David Almada_1]

Hello everyone,
running the commands :
sar -u 3 30 the %idle is always 0
sar -q 3 30 the runq-sz is greather then 4
sar -b 3 30 %wcache >95

the other commands described in the doc "Introduction to performance tuning for HP-UX" didn't reveal anything wrong.
how can I determine the process that is causing the bottleneck?
how can I improve in this case my system performance?

thanks in advance

david almada

[harry d brown jr]

Personally, I'd use glance/gpm (measureware). "glance" (where gpm is the graphical interface), allows you to see the system in near real time mode, something sar, uptime, iostat, and vmstat can't do.

Secondly, get "lsof" from http://hpux.cs.utah.edu/hppd/hpux/Sysadmin/lsof-4.55/

Using glance/gpm, you can "drill" into the IO (disk) and then using lsof, you can easily find where, who , and what is causing your bottleneck. If you don't already have glance installed (it needs a license, but you can install a 30 day TRIAL version from the application CD's).

live free or die
harry

[Steven Sim Kok Leong]

Hi,

Use top or glance to determine the top processes with the highest CPU utilisation.

Hope this helps. Regards.

Steven Sim Kok Leong
Brainbench MVP for Unix Admin
http://www.brainbench.com

[Steven Gillard_2]

What are the other sar -u metrics? If %usr or %sys are high then run top to find out which process is consuming the CPU.

If %wio is high, then you may have a disk bottleneck so run sar -d to find out what disks are busy. If its your swap disk you may have a memory bottleneck.

If you have glance installed run that and have a look at all the CPU / memory / disk metrics.

Regards,
Steve

[Paula J Frazer-Campbell]

Hi David

Attached is the cookbook.

Paula

[Frank Slootweg]

*Why* do you think you have a bottleneck?

Is it the following line? :

> sar -u 3 30 the %idle is always 0

If so, then *also* look at %wio and *add* %wio to %idle to get the effective idle time. See the description of %wio as to why you have to do this.