topic Integrity VM Hyperthreading in Operating System - HP-UX

Integrity VM Hyperthreading

kemo — Tue, 09 Nov 2010 07:27:02 GMT

Hello Gentlemen

I am trying to enable multi-threads in Integrity Virtual Machine "GUEST".
setboot is not showing Hyperthreading Option. it is only in the "HOST".
There are some queries i need help for;

1- Does multithreads equivalent to hyperthreads?
1- How multithreads can help my oracle DB Performance.
2- How to enable multithreads in HPUX system.
3- Is it possible to enable Multithreading in VM Guest.
4- If i enabled Hyperthreads in the HOST it will automatically enable the same in all the GUESTS served by this HOST?

I appreciate your support.

Thanks
Kamal

Re: Integrity VM Hyperthreading

Turgay Cavdar — Tue, 09 Nov 2010 07:59:47 GMT

You must disable Hyperthreading on VM Host. So you can not use (on bot host and guests) Hyperthreading on the HPVM environment.

Re: Integrity VM Hyperthreading

Duncan Edmonstone — Tue, 09 Nov 2010 08:03:28 GMT

I've no idea where you got the term "multithreads" from - in what context are you using it?

Anyway, if we are talking about the capability of a Itanium CPU to run multiple threads at what appears to be the same time, then that is hyperthreading.

Hyperthreading is not supported in VM guests or VM hosts:

http://bizsupport2.austin.hp.com/bc/docs/support/SupportManual/c02023903/c02023903.pdf

See p31

HTH

Duncan

Re: Integrity VM Hyperthreading

Torsten. — Tue, 09 Nov 2010 08:06:13 GMT

The manual says:

"Integrity VM Version 4.2 does not support hyperthreading. Specify the following
command to turn off hyperthreading; otherwise, Integrity VM will not start:

/usr/sbin/setboot -m off

Re: Integrity VM Hyperthreading

kemo — Tue, 09 Nov 2010 08:37:19 GMT

Thanks All
by the way, multithreading is the equivalent of hyperthreading in NON-INTEL processors e.g SPARC.