diff --git a/blueprints/operational_chemistry/namelist.wps b/blueprints/operational_chemistry/namelist.wps
index 4de3e502145378d299a166a4b50caf2788892f63..31afa61e9f6cde1650a7a10b52deeadde2f63853 100644
--- a/blueprints/operational_chemistry/namelist.wps
+++ b/blueprints/operational_chemistry/namelist.wps
@@ -11,9 +11,9 @@
  parent_id         =   1, 1, 2,
  parent_grid_ratio =   1, 9, 5,
  i_parent_start    =   1, 96, 40, 
- j_parent_start    =   1, 77, 40, 
- e_we              =  185, 163, 196, 
- e_sn              =  186, 136, 196, 
+ j_parent_start    =   1, 75, 40, 
+ e_we              =  185, 172, 196, 
+ e_sn              =  186, 163, 196, 
 ! geog_data_res     = 'modis_fpar+modis_lai+modis_lakes+modis_30s+modis_15s+30s', 'modis_fpar+modis_lai+modis_lakes+modis_30s+modis_15s+30s',
 !                     'modis_fpar+modis_lai+modis_lakes+modis_30s+modis_15s+30s',
  dx = 20000,
diff --git a/machine_profiles/alcc_spack/batch_preambles/main b/machine_profiles/alcc_spack/batch_preambles/main
index 4ca2cf381496f85c68ba81ad6134017a94ebd83c..82eae9c15e3a58bcad66e9ab296df556da67dc21 100644
--- a/machine_profiles/alcc_spack/batch_preambles/main
+++ b/machine_profiles/alcc_spack/batch_preambles/main
@@ -1,5 +1,6 @@
 #!/bin/bash -l
 #SBATCH --partition=alcc1,epyc
+#SBATCH --exclusive
 #SBATCH -o __runDir__/__mainJobName__.%j.%N.out
 #SBATCH -D __runDir__
 #SBATCH -J __mainJobName__
diff --git a/machine_profiles/alcc_spack/profile.bash b/machine_profiles/alcc_spack/profile.bash
index b6100caf61d0b840c1adea5b58b078ca7748a8bd..3ba2ef4ddb40d71c0d1d3f5abc87380b4392516a 100644
--- a/machine_profiles/alcc_spack/profile.bash
+++ b/machine_profiles/alcc_spack/profile.bash
@@ -7,14 +7,19 @@ ulimit -s unlimited
 # for intel
 .  /alcc/gpfs2/sw/intel/19/bin/compilervars.sh  intel64
 
+export I_MPI_FABRICS=shm:ofi
+export I_MPI_SHM_OPT=shm
+export FI_PROVIDER=tcp
+export FI_TCP_IFACE=eth5
+
 # --- MPI settings ---
 
-mpiCommandPre="mpirun"
-mpiCommandMain="mpirun"
+mpiCommandPre="srun --mpi=pmi2"
+mpiCommandMain="srun --mpi=pmi2"
 #mpiCommandMain="mpirun -mca pml ucx -mca coll ^hcoll -x UCX_TLS=tcp,shm -x UCX_NET_DEVICES=eth5"
 mpiCommandReal=${mpiCommandPre}
 
-nTasks=96
+nTasks=128
 
 # --- Batch system ---