Unnecessary-job-distribution.md

+* Description:
+  Job distributes tasks over multiple nodes even if they fit one node.
+  This might lead to increased communication latency and redundant network traffic when reading from filesystems.
+
+* Criterion:
+  Number of allocated cores fit one node.
+  Additional criterion: High I/O or Lustre Bandwidth indicates high communication overhead (possibly unreliable metric on shared nodes).
+  Possibly, check SLURM arguments.
+
+* Possible false positives:
+  MPI distributed program uses multiple accelerators and scheduler allocates accelerators on different nodes.
+  Program actually benefits from multiples nodes since it uses a lot of memory bandwidth.
+
+* Possible cures/workarounds: Use -N to specify number of nodes.
+  Use --contiguous to use contiguous resources.