HP Process Resource Manager User's Guide

Glossary
PRMID
Glossary 293
logical volume group A single logical disk
device under control of Logical Volume
Manager (LVM) formed from one or more
physical disk drives. PRM manages disk
bandwidth on a logical volume group basis,
as well as a disk group basis.
Logical Volume Manager (LVM) A
disk-management tool used to partition
physical disk drives.
memory cap An upper limit on a PRM
group’s memory use.
memory isolation A way of separating a
PRM group’s memory so that it cannot loan
out to, or borrow memory from, other groups.
memory manager A daemon that monitors
use of real memory on the system to ensure
that PRM groups are granted their memory
allocations of private memory and shared
memory. This daemon also enforces capping
of private memory when requested.
memory record Record in a PRM
configuration file that specifies a group’s
memory allocation, either of private memory
or shared memory.
MRG Memory Resource Group.
NFS Network File System.
OTHERS group The PRM group OTHERS with
PRMID 1. PRM uses this group as the initial
group for any user who does not have a PRM
user record in the PRM configuration file.
parent group Any PRM group in a
hierarchy that has child groups.
PID Process ID.
polling interval Amount of time a resource
manager waits between its pollings of the
system to determine application placement
or resource use. The polling interval is only
used by the application manager (APPL) and
the memory manager (MEM).
POSIX real-time process A process that
uses the POSIX.4 real-time scheduler
(rtsched). This type of process keeps its
assigned priorities because timely
scheduling is crucial to the operation of a
real-time process. Hence, such a process is
permitted to exceed its CPU shares.
PRM administrator A person responsible
for PRM configuration. This person has root
user capabilities.
PRM group Collection of users and
applications that are joined together and
assigned certain amounts of CPU, memory,
and disk bandwidth resources. Each group
has a name and PRMID. These groups are
defined in a PRM configuration file. A PRM
group record may define a traditional PRM
group (FSS PRM group) or a PSET PRM
group.
PRM group ID PRMID.
PRMID A value that may be used in place of
the PRM group name. For FSS PRM groups,
it is an integer between 0 and 63 (inclusive)
or between 0 and 255 (inclusive) starting
with HP-UX 11i v2 Update 2. PRMIDs for
PSET PRM groups are assigned by PRM.
PRMID 0 (PRM_SYS) is reserved for the
system group. PRMID 1 (OTHERS) is reserved
for the user default group.