HP Process Resource Manager User's Guide

Glossary
PRM_SYS group
Glossary294
PRM_SYS group The PRM group PRM_SYS
with PRMID 0. PRM places all system
processes in this group by default. System
processes are processes started by someone
with UID 0.
process group Every process (except
system processes, such as init and
swapper) belongs to a process group.
(Process groups are different from PRM
groups.) A newly created process joins the
process group of its creator. When you create
a job, the shell assigns all the processes in
the job to the same process group. Signals
can propagate to all processes in a process
group; this is a principal advantage of job
control.
process group ID Each process group is
uniquely identified by an integer called a
process group ID. Each process group also
has a process group leader. The process
group’s ID is the same as the process ID of
the process group leader. Every process in a
process group has the same group ID.
process ID An integer, assigned to a process
at creation, that uniquely identifies the
process to HP-UX.
processor set A subset of the system’s
cores. The default processor set consists of
all cores on the system.
proportional overachievement The ratio
of memory used to memory entitlement for a
group, compared to the average of all groups.
If a PRM group is overachieving compared to
the average, then the number of import
pages for that group is reduced, allowing
other groups to start importing the newly
available memory.
real memory Real memory is shared by all
processes. The data and instructions of any
process (a program in execution) must be
available to the core by residing in real
memory at the time of execution.
real user ID An integer, assigned to a user
at login, that uniquely identifies the
username to HP-UX.
resource manager Tool that either
controls the amount of a resource that a
PRM group uses or ensures applications run
in their appropriate PRM groups. Resource
managers include the application manager
(APPL), the CPU manager (CPU), the disk
bandwidth manager (DISK), and the memory
manager (MEM).
secure compartment See compartment.
Secure Resource Partition You form a
secure resource partition by mapping a
secure compartment to a PRM group.
(Create secure compartment configurations
using the HP-UX feature Security
Containment—or a PRM utility such as
srpgen or prm2scomp.) These partitions
allow you to combine the security and
resource allocation features of Security
Containment and PRM.
Available starting with HP-UX 11i v2
(B.11.23).