Documentation.md

@@ -143,8 +143,9 @@ copy your files yourself.
 
 There are several partitions/queues in slurm intended for general usage:
 
-- “smp”: default partition, with 136 smp nodes
-- “bigsmp”: partition with 8 bigsmp nodes
+- “smp”: default partition, with 136 smp nodes, for single node jobs
+- “bigsmp”: partition with 8 bigsmp nodes, for large single node jobs
+- "mpi": same nodeset as "smp" but for MPI jobs
 - “interactive”: partition with 8 interactive nodes, dedicated for interactive usage
 - “gpu”: partition with 10 gpu nodes with the following gpu types: h100:38, h100_1g.12gb:1, h100_2g.24gb:3, h100_3g.47gb:1, h100_4g.47gb:1
 - “ft-instinct”: a partition with a single node that contains two AMD Instinct MI210 GPUs
@@ -156,8 +157,12 @@ The corresponding node types are:
 - interactive: 192 cores, 1500G RAM
 - gpu: 96 cores, 1500G RAM
 
-Without specifying a partition explicitly with the “-p” parameter, the “smp” 
-partition will be chosen automatically.
+When a partition isn't explicitly specified with the “-p” parameter, the automatic routing mechanism determines the right partition for the job:
+- "mpi" partition:
+   - when the memory specification is core oreiented (mem_per_cpu) and multiple tasks are specified
+   - when multiple nodes are specified
+- "bigsmp”: when the requested memory exceeds 750GB per node
+- "smp": in all other cases
 
 In order to get access to GPU cards, make sure to specify the “gpu” partition 
 as well as the type and number of GPU cards with the “-G” parameter, e.g.