Job Execution Modes

All Sun HPC jobs are handled by the LSF Batch system. Consequently, Sun HPC job submission involves the following:

• When a Sun HPC job is submitted, it is placed in a job queue rather than being launched immediately.

• These queues are created by the system administrator. Each queue is defined by a set of job-launching criteria, called job scheduling policies. These policies can be specified by the administrator, or default queue policies can be used.

• If a job has particular resource requirements and if a particular queue's job scheduling policies meet those requirements, the user can specify that the job be placed on that queue. If a job does not require special execution conditions, the user can leave the choice of queue to the LSF Batch system.

• The job waits in its queue until it reaches the head of the queue and the cluster is able to satisfy the job scheduling policies of that queue. At that point the job is launched.

The LSF Batch system offers an enhanced form of queue-based job scheduling, called interactive batch. This job submission mode provides all the job scheduling and resource management services of the batch environment, while keeping the terminal session from which the job was submitted attached to the job. This allows the user to interact with the job throughout its execution.