HP Process Resource Manager (PRM) manual Capping CPU resource use, Removing groups/CPU allocations

#prmconfig -i [-fconfigfile] {-s -c}

To keep the existing assignments of users, processes, and groups, use the command:

#prmconfig -k [-fconfigfile] {-s -c}

Use the -fconfigfile option to specify a file other than the default /etc/prmconf. The -soption displays warnings regarding the configuration file. (The -coption displays a subset of the -swarnings.)

6.Enable PRM’s CPU manager if it is not already enabled:

#prmconfig -e CPU

Alternatively, enable all PRM resource managers using prmconfig -ewithout any additional arguments:

#prmconfig -e

Capping CPU resource use

CPU capping allows you to limit the amount of CPU resources that FSS PRM groups use. PRM provides two types of CPU capping:

•On a per-group basis

(Available for HP-UX 11i v3 and later.) For per-group capping, use the MAX field in the FSS PRM group record (discussed in the section “Group/CPU record syntax” (page 55)) for only those groups you want to cap.

•For all FSS PRM groups in the configuration

The CPUCAPON mode, enabled through the prmconfig -Moption, is discussed below. In this mode, PRM treats the minimum allocation for each FSS PRM group as its maximum allocation.

The syntax for a FSS group/CPU record is:

GROUP:PRMID:SHARES:[MAX]:

When you cap CPU resource use via CPUCAPON mode, the percentages computed from the SHARES values of the FSS PRM groups are also used as caps. The mode is in effect for all user-configured FSS PRM groups on a system when enabled, regardless of system load. This mode, however, does not affect the PRM_SYS group. PSET PRM groups are capped on CPU resource use as a result of the number of cores assigned to the group.

Turn on CPU capping by entering the command:

#prmconfig -M CPUCAPON

Turn off CPU capping by entering the command:

#prmconfig -M CPUCAPOFF

Using prmconfig -ror prmconfig -d CPU also turns CPU capping off.

Removing groups/CPU allocations

To remove group/CPU allocations with a text editor:

1.Open the configuration file in a text editor.

2.Remove the line corresponding to the group/CPU record you wish to remove. If the group is a parent group, you will need to remove all the child groups first. Group/CPU records have one of the following forms:

GROUP:PRMID:SHARES:[MAX]:

GROUP:HIER:SHARES:: GROUP:PSET:::[CORES]:[CORE_LIST][:PSET_ATTR]

58 Configuring and enabling PRM on the command line