HP-UX Workload Manager User's Guide

Glossary
deactivated processor
Glossary518
deactivated processor A processor that
either has not yet been activated or that has
been turned off by the Instant Capacity
software (formerly known as iCOD software)
and returned to the pool of inactive
processors. These processors are available
for activation.
default PSET In configurations managing
PSET-based and FSS workload groups, the
default PSET, when created at system
initialization, consists of all of your system’s
processors. Afterward, the default PSET
consists of only those processors that were
not assigned to other PSET groups. All FSS
groups reside in the default PSET, which is
where all FSS group CPU resource
allocation occurs. The system administrator
can create additional PSET groups and
assign processors, applications, and users to
those groups. Applications and users that
are assigned to a PSET workload group have
dedicated CPU resources from the cores
assigned to the group. Competition for CPU
resources within the processor set are
handled using the HP-UX time-share
scheduler. See also PSET workload.
disk manager A kernel routine that
monitors bandwidth at the logical volume
group level, rearranging I/O requests as
needed to ensure disk bandwidth shares.
EMS Event Monitoring Service. An HP
product for monitoring system resources and
sending/receiving notifications when events
occur. WLM uses the EMS notification
framework to send alarms.
entitlement The minimum percentage
(lower limit) of a resource that a workload
group receives. For CPU resources, this
percentage is either the number of CPU
shares the workload group is assigned
relative to the number of cores multiplied by
100 (absolute CPU units are enabled)—or
the number of CPU shares a workload group
is assigned relative to the total number of
CPU shares assigned (absolute CPU units
are not being used). For memory, you can
specify this percentage directly in the WLM
configuration file. For disk bandwidth, the
percentage is based on a workload group’s
number of shares relative to the total
number of shares assigned.
file ID ID used by the application manager
to place processes in the appropriate
workload groups. The file ID is based on the
file system device and inode number.
FSS workload group A WLM workload
group that has its CPU use managed by the
fair share scheduler (FSS). See also PSET
workload.
goal A measure of workload performance or
resource utilization that must be achieved to
meet an SLO. See also stretch goal.
global arbiter A WLM daemon used in
managing WLM instances on various virtual
partitions.
Hyper-Threading The logical CPU feature
that allows multiple execution threads
(logical CPUs) within a single core. See
also core, logical CPU.
initial group The first workload group
listed in a user’s record in a configuration
file. Typically, the applications a user