EPYC-specific MPI command, tbc

blueprints/operational_chemistry/machine_specific/alcc_spack/batch_preambles/main

 #!/bin/bash -l
-#SBATCH --partition=alcc1,epyc
+#SBATCH --partition=epyc
 #SBATCH -o __runDir__/__mainJobName__.%j.%N.out
 #SBATCH -D __runDir__
 #SBATCH -J __mainJobName__

blueprints/operational_chemistry/machine_specific/alcc_spack/config.bash

@@ -60,7 +60,7 @@ removeRunDir=false
 # --- MPI settings ---
 
 mpiCommandPre="mpirun /usr/bin/time -v"
-mpiCommandMain="mpirun /usr/bin/time -v"
+mpiCommandMain="mpirun -mca pml ucx -mca coll ^hcoll -x UCX_TLS=tcp,shm -x UCX_NET_DEVICES=eth5 /usr/bin/time -v"
 mpiCommandReal=${mpiCommandPre}
 
 # --- Batch system ---