HP-UX Workload Manager User's Guide

Configuring WLM
Trying a configuration without affecting the system
Chapter 5238
• When an application is run, which workload group does it run in?
• Can I run an application in a particular workload group?
• Are the alternate names for an application set up correctly?
Furthermore, using metrics collected with glance_prm, passive mode
can be useful for capacity planning and trend analysis. For more
information, see glance_prm(1M).
Passive mode versus actual WLM management
This section covers the following topics:
• The WLM feedback loop
• Effect of mincpu and maxcpu values
•Using wlminfo in passive mode
• The effect of passive mode on usage goals and metric goals
The WLM feedback loop
WLM operations are based on a feedback loop: System activity typically
affects WLM arbitration of service-level objectives. This arbitration
results in changes to CPU allocations for the workloads, which can in
turn affect system activity—completing the feedback loop.
The following diagram shows normal WLM operation, including the
feedback loop.
Figure 5-7 Normal WLM operation
In passive mode, however, the feedback loop is broken, as shown in the
following diagram.
System activity
WLM
Usage/metrics
Allocation changes