HP Process Resource Manager User's Guide

Understanding how PRM manages resources
How PRM manages CPU resources
Chapter 2 45
Example: PRM CPU resource management
Figure 2-2 illustrates PRM’s CPU resource management for two FSS
PRM groups.
In this example, Group1 has 33 CPU shares, and Group2 has 66 CPU
shares.
Note that the percentage of CPU resources referred to may not be total
system CPU resources if PSET PRM groups are configured. The
percentage is of CPU resources available on the cores assigned to the
default PSET. If PSET PRM groups are not configured, then the
available CPU resources are the same as the system CPU resources.
Figure 2-2 PRM CPU resource management
At Time A:
• Group1 is using 40% of the available CPU resources, which is more
than its share.
• Group2 is using 15% of the available CPU resources, which is less
than its share.
• 45% of the available CPU resource are not used.
• PRM scheduling is not in effect.
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90
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0
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ABC
Time
CPU
Group1: 33
Group2: 66
Group1
Group2
CPU resource
resource
use
use at 100%