Using and Administering

Scheduler Considerations

Several LoadLeveler job command language keywords are associated with parallel jobs. Whether a keyword is appropriate is dependent upon the type of job and the type of LoadLeveler scheduler you are running.

Table 4 shows you the parallel keywords supported by the LoadLeveler Backfill scheduler, based on the type of job you are running.

Table 4. Parallel Keywords Supported by the Backfill Scheduler

job_type=parallel	job_type=pvm3
network node node_usage tasks_per_node total_tasks task_geometry blocking All keywords supported for job_type=pvm3 (supported for compatibility reasons)	Adapter requirement max_processors min_processors network parallel_path

Table 5 shows you the parallel keywords supported by the default LoadLeveler scheduler, based on the type of job you are running.

Table 5. Parallel Keywords Supported by the Default Scheduler

job_type=parallel	job_type=pvm3
max_processors min_processors Adapter requirement	max_processors min_processors parallel_path Adapter requirement

These keywords are used in the examples in this chapter, and are described in more detail in Job Command File Keywords.

If you disable the default LoadLeveler scheduler to run an external scheduler, see Usage Notes for an explanation of which keywords are supported.