Low-GPU-utilization.md

+* Description: a low GPU utilization usually hints at an inefficient use of the GPUs
+* Criterion:
+  * nv_util << 1
+  * (or nv_mem_util << 1)
+  
+* Works for shared jobs with existing metrics:
+  * yes, if a GPU is allocated to at most one compute job
+  
+* Possible false positives:
+  * 
+
+* Possible cures/workarounds:
+  * check MPI-rank-GPU affinity/visibility
+  * check the suitability of the GPU setup/configuration for the given workload
+  * check applications internal GPU distribution settings
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