HP-UX Virtual Partitions Administrator's Guide (includes A.03.05 and A.04.05)

• “CPU: Notes on vPars Syntax, Rules, and Output” (page 198)
• Additional CPU Topics
— “CPU: Dual-Core Processors” (page 200)
— “CPU: Hyperthreading ON/OFF (HT ON/OFF)” (page 202)
— “CPUs: Managing I/O Interrupts” (page 203)
— “CPU: CPU Monitor (formerly known as LPMC Monitor)” (page 204)
CPU: Concepts and Functionality
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 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 on a specified cell.
For more information on dual-core processors, see “CPU: Dual-Core Processors” (page 200).
CPUs: Definitions for CPUs
Beginning with vPars A.04.01, the concept and restrictions of bound and unbound CPUs have
been removed. Now, there are two types of CPUs: boot processors and dynamic CPUs.
Boot Processor This is the CPU on which the OS kernel of the virtual partition was booted.
There is one boot processor per virtual partition. On booting of a virtual
partition, the vPars Monitor determines which CPU becomes the boot
processor. Note that the specific CPU chosen as the boot processor may
differ across virtual partition reboots.
Dynamic CPUs These are all the other CPUs, because all CPUs, except the boot processor
of each virtual partition, can be dynamically migrated. You can find which
CPU is the boot processor by using the vparstatus command; see
“Commands: Displaying Monitor and Resource Information (vparstatus)”
(page 133).
You can manage CPUs in multiple ways:
by min and max limits: See “CPU: Specifying Min and Max Limits” (page 195)
by total See “CPU: Adding and Deleting by Total” (page 195)
by cell local processor See “CPU: Adding or Deleting by CLP (Cell Local
Processor)” (page 197)
by hardware path See “CPU: Adding or Deleting by Hardware Path” (page 197)
194 CPU, Memory, and I/O Resources (A.05.xx)