HP-UX Workload Manager User's Guide

Configuring WLM
Tuning the metrics and the SLOs
Chapter 5218
With relative CPU units (absolute_cpu_units = 0, the default), the
units you specify represent a percentage of the system’s total CPU
resources and are consequently relative to the number of active cores.
For example, the following statement:
mincpu = 50;
is 50% of the system’s CPU resources, which is 50% of one core on a
system with only one active core, but is eight cores on a system with 16
active cores.
To use absolute CPU units, use the following statement in a global tune
structure:
absolute_cpu_units = 1;
NOTE Several conditions involving absolute_cpu_units can cause your WLM
configuration file to be invalid:
• Setting absolute_cpu_units equal to 0 and setting primary_host
• Setting absolute_cpu_units equal to 0 in a configuration that does
not have a prm structure
• In a configuration with a prm structure:
— Setting absolute_cpu_units equal to 0 and specifying a PSET
group
• In a configuration without a prm structure:
— Setting absolute_cpu_units equal to 0 and setting hmincpu
— Setting absolute_cpu_units equal to 0 and setting hmaxcpu
— Setting absolute_cpu_units equal to 0 and setting hweight
Distributing excess CPU resources to your workloads
(optional)
By default, if any CPU resouces remain after satisfying all SLOs, the
remainder is given to OTHERS. To distribute this excess to the workloads
you have defined, set the distribute_excess tunable to 1 (true) in a
global tune structure: