HP-UX Processor Sets

HP-UX Processor Sets 23
ÿ Use PRM. The HP PRM maintains the configuration in a database. When PRM is
started after reboot, it can restore the configuration saved in the database.
ÿ Use psrset. The psrset command provides a command line interface for processor
set configuration, which can be programmed as a shell script for the desired
configuration. The administrator can set up the invocation of the processor set
configuration script from the system boot time script, so that the system is already
set up with the desired processor set configuration when the system is ready for use.
Integration with PRM
HP-UX Process Resource Manager (PRM) is a software product for managing system
resources (processor, memory, disk I/O bandwidth) among applications and users. The HP-
UX PRM administrator assigns applications and users to PRM groups, and sets up each PRM
group with a portion of system resources. PRM assigns processor resource entitlements
(guaranteed minimums) to each PRM group as a number of shares, and the HP-UX scheduler
enforces the shares allocation among PRM groups. The allocation of shares ensures a certain
percentage of processor cycles from every processor to PRM groups.
With processor sets integration, PRM can now allocate processor resources to PRM groups
as entire processors. The PRM administrator may specify that a PRM group is now a Pset
PRM group. The Pset PRM group, instead of receiving shares of available processor cycles,
is now assigned a specified number of processors. PRM continues to support shares-based
PRM groups within the Default Pset.
PRM-based system resource management provides the following benefits:
ÿ PRM supports memory resource allocation to PRM groups. When coupled with
Psets, the administrator can isolate processors and memory in a PRM group for
applications and users.
ÿ PRM provides a GUI for configuration of psets and workload assignment.
ÿ PRM can preserve the same configuration across reboots.
ÿ PRM allows second level of resource management using shares within Default Pset.
ÿ PRM automatically moves workloads (applications and users) into the appropriate
PRM groups.
Integration with iCOD
The HP-UX iCOD (Instant Capacity On Demand) product allows dynamic deactivation and
reactivation of processors in the system, based on user needs. The system may be