Cluster Queues Table

Throughout its duration, a running job is associated with its queue. Queues provide a way to define various job execution parameters that apply to multiple hosts. You can think of an N1GE queue as a container, or description, for a class of jobs. Queues that span multiple execution hosts are sometimes referred to as cluster queues.

The Cluster Queues table shows a summary of the state of all the cluster queues configured on the grid. The slots are indicative of general performance. The states indicate which queues are running various potential error states. The fields include:

• Cluster Queue — The name given to a queue.

• Total Slots — The total number of slots configured for this queue. Slots are the maximum number of jobs that a queue can run simultaneously.

• Used — The number of total slots currently being used by the queue. Queues should be using all of the total slots, although in some cases, enough free resources might not be available to accommodate every slot.

• Alarm — When present, indicates that at least one of the load thresholds defined in the load_thresholds list of the queue configuration is currently exceeded. This state prevents N1GE from scheduling further jobs to that queue. For more information, see the queue_conf(5)) man page.

• Disabled — The number of slots that are not running because the queue or host has been disabled either manually or automatically. All jobs associated with that queue are also disabled. You assign and release this state to a queues using the qmod(1) command. New jobs are also not accepted by these slots, although jobs running continue to run.

• Suspended — The number of slots that are not running because the queue or host has been suspended either manually or automatically. All jobs associated with these slots are also suspended, and no new jobs are accepted by these slots.

• Error/Unknown — the number of slots that are in the error state, due either to a problem experienced by a previous job in this slot or else due to a host being unreachable.

For information on cluster queues, see the Monitoring and Controlling Queues section in the N1GE 6 User's Guide and the qmon man page. For more information on queue states see the Queue Alerts.