HP Process Resource Manager User's Guide

Overview

What is HP Process Resource Manager?

Chapter 1 21

Group/CPU Speciﬁes a PRM group’s name and its CPU allocation.

The two types of PRM group records are FSS PRM

group records and PSET PRM group records. An FSS

PRM group is the traditional PRM group, whose CPU

entitlement is speciﬁed in shares. This group uses the

Fair Share Scheduler (FSS) in the HP-UX kernel

within the system’s default processor set (PSET). A

PSET PRM group is a PRM group whose CPU

entitlement is speciﬁed by assigning it a subset of the

system’s cores (PSET). Processes in a PSET have equal

access to CPU cycles on their assigned cores through

the HP-UX standard scheduler.

Memory Speciﬁes a PRM group’s memory allocation, either of

private memory or shared memory. There are two types

of memory records:

• Private

Speciﬁes a minimum amount of private memory.

Optionally speciﬁes a cap on memory use as well as

memory isolation (so that memory cannot be loaned

out or borrowed from other groups).

• Shared

Speciﬁes a minimum amount of memory in

megabytes for use as shared memory for the

processes in that PRM group.

PRM groups without a shared memory record

default to PRM_SYS for shared memory allocation.

Disk bandwidth Speciﬁes an FSS PRM group’s disk bandwidth shares

for a given logical volume group (LVM) or disk group

(VxVM). You cannot specify disk bandwidth records for

PSET PRM groups. PSET PRM groups are treated as

part of PRM_SYS (PRMID 0) for disk bandwidth

purposes.