Host Resource Attributes

Host resource attributes are parameters that are intended to be managed on a host basis.

The default host-related attributes are load values. You can add new resource attributes to the default attributes, as described earlier in Queue Resource Attributes.

Every sge_execd periodically reports load to sge_qmaster. The reported load values are either the standard load values such as the CPU load average, or the load values defined by the administrator, as described in Load Parameters.

The definitions of the standard load values are part of the default host resource attributes, whereas administrator-defined load values require extending the host resource attributes.

Host-related attributes are commonly extended to include nonstandard load parameters. Host-related attributes are also extended to manage host-related resources such as the number of software licenses that are assigned to a host, or the available disk space on a host's local file system.

If host–related attributes are associated with a host or with a queue instance on that host, a concrete value for a particular host resource attribute is determined by one of the following items:

• The queue configuration, if the attribute is also assigned to the queue configuration

• A reported load value

• The explicit definition of a value in the complex_values entry of the corresponding host configuration. For details, see Configuring Hosts.

In some cases, none of these values are available. For example, say the value is supposed to be a load parameter, but sge_execd does not report a load value for the parameter. In such cases, the attribute is not defined, and the qstat –F command shows that the attribute is not applicable.

For example, the total free virtual memory attribute h_vmem is defined in the queue configuration as limit and is also reported as a standard load parameter. The total available amount of virtual memory on a host can be defined in the complex_values list of that host. The total available amount of virtual memory attached to a queue instance on that host can be defined in the complex_values list of that queue instance. Together with defining h_vmem as a consumable resource, you can efficiently exploit memory of a machine without risking memory oversubscription, which often results in reduced system performance that is caused by swapping. For more information about consumable resources, see Consumable Resources.

Only the Shortcut, Relation, Requestable, Consumable, and Default columns can be changed for the default resource attributes. No default attributes can be deleted.