HP-UX Workload Manager User's Guide

Appendix F 447
F Understanding how PRM
manages resources
One of the ways in which WLM performs resource management is
through HP Process Resource Manager (PRM).
This appendix focuses on management using PRM. The appendix is for
background information and is included here only for completeness, as
WLM uses some of these concepts and tools.
Table F-1 provides an overview of the resource management.
Table F-1 Resources managed
Resource
managed
Management algorithm
CPU (core) Set minimum and maximum CPU request values and/or a
shares-per-metric request, then WLM automatically adjusts cores based on
workload performance, priority, and available cores.
With WLM, you can also set hard limits on CPU usage with the gmincpu
and gmaxcpu keywords.
Disk
bandwidth
PRM re-orders the Logical Volume Manager (LVM) volume group’s I/O
requests in the kernel based on the PRM group shares.
Real
memory
If the system is paging or a workload group is exceeding its cap, the prm2d
memory manager forces the group’s processes to re-use their own workload
group’s memory.
With WLM, you can also set hard limits on memory usage with the gminmem
and gmaxmem keywords.