HP Process Resource Manager User's Guide

Understanding how PRM manages resources
How PRM controls resources
Chapter 2 35
resources using processor sets. Real memory resources are allocated in
shares (private memory) or megabytes (shared memory). You cannot
allocate disk bandwidth resources to PSET PRM groups.
What are processor sets?
Processor sets allow cores on your system to be grouped together in a set
by the system administrator and assigned to a PSET PRM group. Once
these cores are assigned to a PSET PRM group, they are reserved for use
by the applications and users assigned to that group. Using processor
sets allows the system administrator to isolate applications and users
that are CPU-intensive, or that need dedicated on-demand CPU
resources.
How processor sets work
Processor sets are a way of allocating dedicated CPU resources to
designated applications and users. At system initialization time, a
default PSET is created. This default PSET initially consists of all of
your system’s cores. All FSS PRM group CPU allocation occurs in the
default PSET. The system administrator can create additional PSET
PRM groups and assign cores, applications, and users to those groups.
Once cores are assigned to a PSET PRM group, they cannot be used by
another group until a new configuration is loaded.
NOTE When you have PRM groups based on PSETs enabled:
• Do not modify the PSETs manually using the psrset command
• Do not adjust CPU counts in virtual partitions using the vparmodify
command
• Do not adjust Instant Capacity (iCAP), Temporary Instant Capacity
(TiCAP), or Pay Per Use resources using the icapmodify or
ppuconfig commands
• Do not perform online cell operations, using parolrad or any other
interface, while PRM is managing the system (For more information,
see the WARNINGS section in the prmconfig(1) manpage.)