Contains the definition of Workload Manager (WLM) superclasses or subclasses for a given configuration.
The classes file in the /etc/wlm/Config directory describes the superclasses of the WLM configuration, Config. If the superclass Super of this configuration has subclasses defined, these subclasses are defined in the file /etc/wlm/Config/Super/classes.
Some attributes apply to only superclasses or to only subclasses. The description of the classes file uses the terms class or classes when a statement applies to both superclasses and subclasses.
The classes file is organized into stanzas. Each stanza names a WLM class and contains attribute-value pairs that describe characteristics of the class.
Attributes
Each stanza names a WLM class. Class names can contain only upper- and lowercase letters, numbers, and underscores. They are limited to 16 characters in length. The only names that have special meaning to the system are Default, Shared, Unclassified, Unmanaged, and System. You cannot use Unclassified and Unmanaged as class names. The superclasses Default, Shared, and System are always defined. The subclasses Default and Shared are always defined.
| Item | Description |
|---|---|
| tier | Specifies the position of the class in the hierarchy of resource limitation desirability for all classes. A class with a lower tier value will be more favored than a class with a higher tier value. The tier value is a number from 0 to 9. If this attribute is not defined, it defaults to 0. |
| inheritance | If the inheritance attribute is given the value Yes, the children of processes in this class remain in the class upon execution, regardless of the automatic assignment rules in effect. If this attribute is given No, the normal assignment rules apply. If not defined, the attribute defaults to No. |
| localshm | Indicates whether memory segments accessed by processes in different classes remain local to the class they were initially assigned to or if they go to the Shared class. The possible value is Yes or No. If not specified, the default is No. |
| authuser | Specifies the user name of the user allowed to assign processes to this class. If not defined, this attribute defaults to the empty string (""). |
| authgroup | Specifies the group name of the group of users allowed to assign processes to this class. If not defined, the attribute defaults to the empty string. |
| rset | Names the resource set to which the processes in the class have access. If the attribute is not defined, it defaults to an empty string, meaning that the class has access to all the resources on the system. |
| adminuser | Specifies the user name of the user allowed to administer
the subclasses of this superclass. If not defined, the attribute defaults
to the empty string. This attribute is valid only for superclasses. |
| admingroup | Specifies the group name of the group of users allowed to administer
the subclasses of this superclass. (Primary group of users should
match with this group name.) If this attribute is not defined, it
defaults to the empty string. This attribute is valid only for superclasses. |
| delshm | If set to "yes", or if a killed process due to a virtual memory limit is the last process referencing a shared segment, the segment is deleted. The default is to not delete the shared segments (value set to "no"). |
| vmenforce | When a class reaches its virtual memory limit, if vmenforce is set to "class", all of the processes classified to the faulting class are killed. If vmenforce is set to "proc" (default), then only the process that pushes the usage past the virtual memory limit is killed. |
The attributes that have not been explicitly set by a WLM administrator using any of the administration tools (file editing, command line, or SMIT) are omitted in the property files.
The default values mentioned above are the system defaults and can be modified using a special stanza named "default."
| Item | Description |
|---|---|
| classes | Defines the superclasses or subclasses of a WLM configuration |
The WLM property files defining the superclasses of a WLM configuration must have write permission only for the root user. The WLM property files defining the subclasses of a superclass must have write permission for the adminuser and admingroup for the superclass.
If there is no adminuser for the superclass, the files should be owned by root. If no admingroup exists for a superclass, the WLM property files for the superclass should be group "system" with no write permission for group.
default: tier = 1 inheritance = "yes"
The scope of these user-defined default values is limited to the file where they appear. For instance, if the above default stanza appears in the top-level classes file of a configuration, it does not affect the default values for the classes files defining the subclasses of the various superclasses.
* system defined classes
* All attributes to default value
* Attribute values can be specified
*
Default:
System:
Shared:
* User defined classes
*
Super1:
inheritance = "yes"
adminuser = "bob"
authgroup = "devlt"
Super2:
tier = 4
localshm = "yes"
admingroup = "sales"
authuser = "sally"
rset = "part1"