HP Process Resource Manager User's Guide

Glossary 291
Glossary
alternate name Other names assigned to
processes spawned by an application. This is
most common for complex programs such as
database and mail programs that launch
many processes and rename them.
alternate group A PRM group other than
the user’s initial group that a user can access
using prmrun or prmmove. For users, these
groups are listed in their user records (or
their netgroups’ user records) in the PRM
configuration file following the initial group.
Root users can access all PRM groups, so
alternate groups need not be specified in
their user record.
application manager A daemon that polls
the PRM configuration file and the running
processes to ensure all processes are in the
proper PRM groups.
application record Record in a PRM
configuration file that specifies the PRM
group an application is to run in. This record
can optionally specify any alternate names
an application may take upon execution.
available memory The amount of real
memory not reserved for the kernel or root
processes. Available memory is used by the
system for executing user processes.
child group In a hierarchy, a PRM group
that has a parent group.
compartment You create a compartment
configuration using the HP-UX feature
Security Containment, which is available
starting with HP-UX 11i v2 (B.11.23). You
can also use a PRM utility such as srpgen or
prm2scomp. PRM then allows you to map
your compartments to PRM groups so you
can control resource allocation.
configuration file File (/etc/prmconf by
default) that PRM uses to determine group
names, resource shares, applications’
assigned groups, and other items. Additional
configuration files are typically stored in the
directory /etc/opt/prm/conf, with the owner
set to hpsmh. You can edit these files with a
text editor, the PRM interface in HP System
Management Homepage, or the PRM
interface in HP Systems Insight Manager.
core The actual data-processing engine
within a processor. A single processor might
have multiple cores. A core might support
multiple execution threads, as explained in
the section “Hyper-Threading” on page 49.
CPU cap An upper limit on a group’s
CPU resource use. PRM caps CPU
consumption for FSS PRM groups using
either CPUCAPON mode (enabled through
prmconfig) or per-group capping (available
for HP-UX 11i v3 and later), which uses the
MAX field in the group record.
CPU manager PRM uses the Fair Share
Scheduler (FSS) to manage CPU resources
for FSS PRM groups. For PSET PRM groups,
processes have equal access to CPU cycles
through the HP-UX standard time-share
scheduler.