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--- caviness:slurm-manual:intro [2019/08/08 18:08]
frey
+++ caviness:slurm-manual:intro [2019/08/23 19:13] (current)
frey [What are resources?]
@@ Line 39: / Line 39: @@
   * System memory (RAM)
   * Coprocessors (nVidia GPUs)
-  * Time
+  * Wall time((wall time = elapsed real time))
+Though default values exist for each, you are encouraged to always make explicit the levels required by a job.  In general, requesting more resources than your job can effectively (or efficiently) use:
+  - can delay start of your job (e.g. it takes longer to coordinate 10 nodes' being free versus a single node)
+  - may decrease your workgroup's relative job priority versus other workgroups (further delaying future jobs)
+==== Queues and partitions ====
+With other job schedulers, a //queue// is an ordered list of work to be performed.  There are one or more queues and jobs are submitted to specific queue(s).  Each queue has a set of hardware resources associated with it on which the queue can execute jobs.
+Slurm starts from the other end and uses a //partition// to represent a set of hardware resources on which jobs can execute.  A single queue contains all jobs, and the partition selected for each job constrains which hardware resources can be used.
-Though default values exist for each, you are encouraged to always make explicit the levels required by a job.