HP-UX Virtual Partitions Administrator's Guide (includes A.05.02)

CPU, Memory, and I/O Resources (A.04.xx)

CPU

Chapter 7

258

CPU

NOTE Processor Terminology

Processing resources under vPars, both as input arguments and command outputs, are

described as “CPUs.” For multi-core processors such as the PA-8800 and dual-core Intel

Itanium 2 processors, the term “CPU” is synonymous with “core.” The term “processor” refers to

the hardware component that plugs into a processor socket. Therefore a single processor can

have more than one core, and vPars commands will refer to the separate cores as distinct

“CPUs,” each with its own hardware path.

Two vPars terms pre-date multi-core processors, so they are exceptions to this terminology:

• “Boot processor,” which refers to the CPU (that is, core) on which the OS kernel of the

virtual partition was booted.

• “Cell local processor (CLP),” which refers to a CPU (core) on a speciﬁed cell.

For more information on dual-core processors, see “CPU: Dual-Core Processors” on page 269.

CPU migration refers to adding CPUs to and deleting CPUs from a virtual partition. Dynamic CPU

migration refers to migrating CPUs while the target virtual partition is running. vPars allows the

assignment of most CPUs while the virtual partitions are running.

For vPars A.04.01 and later, the two types of CPUs are Boot Processor and dynamic CPUs. This

discussion begins at “CPU: Boot Processor and Dynamic CPU Deﬁnitions” on page 259. The bound and

unbound CPU types in vPars A.03.xx and earlier no longer apply.

For additional information on using iCAP (formerly known as iCOD), including temporary-iCAP CPUs with

vPars, see “CPU: Using iCAP (Instant Capacity on Demand) with vPars (vPars A.04.xx and iCAP B.07)” on

page 267.

NOTE Using vPars A.03.xx and Earlier Syntax on a vPars A.04.xx System

Although not recommended under most circumstances, you can still use the vPars A.03.xx CPU

syntax on vPars A.04.xx systems. However, the concepts and rules of boot processors and

dynamic CPUs in A.04.xx will apply because the concepts and rules of bound and unbound

CPUs in A.03.xx no longer apply.

For more information, see “CPU: Syntax, Rules, and Notes” on page 265.