HP Process Resource Manager User's Guide

Understanding how PRM manages resources
How PRM controls resources
Chapter 238
To give the new group 50% of the available CPU resource, we assign it
four shares, the total number of shares in the old configuration, thereby
doubling the total number of shares in the new configuration.
Hierarchical PRM groups
In addition to the flat divisions of resources presented so far, you can nest
FSS PRM groups inside one another—forming a hierarchy of groups
similar to a directory structure. Hierarchies allow you to divide groups
and allocate resources more intuitively than you can with flat
allocations. Note that PSET PRM groups cannot be part of a hierarchy.
When forming a hierarchy, any group that contains other groups is
known as a parent group. Naturally, the groups it contains are known as
child groups. All the child groups of the same parent group are called
sibling groups. Any group that does not have child groups is called a leaf
group.
There is also an implied parent group of all groups where the implied
parent has 100% of the resource to distribute.
Figure 2-1 illustrates a configuration with hierarchical groups,
indicating the parent, child, sibling, and leaf PRM groups.
Table 2-3 Altered configuration
PRM group CPU shares
CPU resource
percentage determined
by PRM
GroupA 1 12.50%
GroupB 2 25.00%
GroupC 4 50.00%
OTHERS 1 12.50%