Intel® Itanium® Processor 9560 Performance 8 32 MB 170 W 2.53 GHz

[KINGSLEY_1]

Hello All!

We have 3 processors out of the 8 above on a vpar. This vpar hosts a banking appliction. the cpu peak time ulitilization is always 100% therefore stalling the application.

The total memory on this vpar is 29G and it is 8G used. Further checks revealed that hyperthreading is enabled at installation on the OS, but the tunable "lcpu_attr is 0.

Could it be the cause?

kindly help me out.

kingsley.

P.S. This thread has been moved from HP-UX>System Administration to HP-UX > virtualization. -HP Forum Moderator

[pooderbill · Accepted solution]

There are two steps to enabling hyperthreading:

Using setboot -v, it will show the system board status for hyperthreading:

...

Hyperthreading : OFF

...

Turn the feature on with: setboot -m on

The second step is with the kernel parameter lcpu_attr.

Turn the kernel feature on with:

# kctune lcpu_attr=1
==> Update the automatic 'backup' configuration first? y
* The automatic 'backup' configuration has been updated.
* Future operations will update the backup without prompting.
* The requested changes have been applied to the currently running configuration.
Tunable Value Expression Changes
lcpu_attr (before) 0 Default Imm (auto disabled)
(now) 1 1

# kctune -q lcpu_attr
Tunable Value Expression Changes
lcpu_attr 1 1 Imm (auto disabled)

Now whether this has any effect on your application is unknown. The first step is to determine what processes are consuming all the CPU time. Use glance (optional product) sorted by CPU usage, or top. glance will show CPU usage more than 100% for processes that are threaded. Do you have runaway processes that are not functioning correctly? In the top report, what are the 3 CPU load values (also from uptime)? Have you tried adding additional CPUs to this vPar?

Is this something new or has it always been that way?

[KINGSLEY_1]

Hi Pooderbill!

Thank you very much for the direction. In fact, we added one more processor and also enabled the hyperthrearding and the problem has been resolved.

Once again I thank you very much.

kingsley