HP-UX Workload Manager User's Guide

Configuring WLM
Defining the PRM components (optional)
Chapter 5 159
Specifying workload groups (optional)
A workload group can be one of two types: FSS or PSET.
An FSS group is allocated CPU resources by the Fair Share Scheduler
(FSS) in the HP-UX kernel. WLM can automatically adjust the CPU
allocation for an FSS group based on the group’s progress toward an
SLO. You can define multiple SLOs for a single FSS workload group.
A PSET group is based on a processor set. A PSET group’s CPU
resources are determined by the number of cores assigned to the PSET
group. With PSET groups, you can define one or more slo structures per
group, but it is not required. If a PSET group has an SLO, WLM uses
absolute CPU units. With these units, 100 represents one core. For more
information on absolute CPU units, see the section “Using absolute CPU
units” on page 217.
Processes in either type of group have equal access to the CPU resources
allocated to their group. Within a group, the HP-UX standard scheduler
is used.
Define these groups using the groups keyword. The groups keyword
must appear exactly once in a configuration.
Specify workload group names and their IDs in the prm structure using
the following syntax:
groups = { FSS_group_def | PSET_group_def [: LCPU = {ON | OFF} ]} [, ...];
An FSS_group_def has the following syntax:
group : group_ID
where
group Is the workload group name. Use names that are less
than eight characters long for proper display by the
ps -P command. Do not start the name with an
underscore (_).
The PRM_SYS group is the default group for processes
run by the root user. You can specify PRM_SYS as an
FSS group (group_ID must be 0) and use it with the
apps, user, scomp, or procmap keywords in a prm
structure. You cannot, however, use it with the
gminmem, gmaxmem, or memweight keywords, in an slo
structure, or as a PSET group.