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Bound and unbound cpu in vpars

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Vijaykumar_1
Valued Contributor

Bound and unbound cpu in vpars

Hi,Can anyone clarify the concept of bound & unbound CPU in vpar..
3 REPLIES
Bill Costigan
Honored Contributor
Solution

Re: Bound and unbound cpu in vpars

Bound CPUs are attached to a vPar and cannot be removed while the vPar is up and running. IO interupts use the bound CPUs.

The unbound CPUs can be added or removed with the vparmodify command. You can add and remove these CPUs to manage performance levels across vPars. e.g vPar1 needs more CPU and vPar3 doesn't need all the CPUs it has - Move CPUs from vPar3 to vPar1.
Duncan Edmonstone
Honored Contributor

Re: Bound and unbound cpu in vpars

Just to add to what Bill said, for "reasonable" IO performance you should probably consider using a rule of thumb of making about 25% of the CPUs in a vPar "bound" - otherwise you can end up with all the IO interrupts running on a small number or single CPU, which can effect performance...

You only need to worry about bound CPUs on vPars running 11.11 - vPars on 11.23 and 11.31 don't have the concept of bound CPUs.

HTH

Duncan

HTH

Duncan
Vijaykumar_1
Valued Contributor

Re: Bound and unbound cpu in vpars

Thanks all