Fix infiniband warning when running on one node.

workflow/helper.py

@@ -69,6 +69,9 @@ def launch_batch_job(
             num_machines = math.ceil(
                 job_settings.ntasks / computer.get_default_mpiprocs_per_machine()
             )
+        if num_machines == 1:
+            # Disable infiniband to get reduce warnings "... error initializing an OpenFabrics device"
+            prepend_text += "export OMPI_MCA_btl=^openib\n"
         # "max_memory_kb": 1024, # sets --mem which is not supported by EVE
         # "custom_scheduler_commands": "--mem-per-cpu=1G", # does not work
         options_dict.update({"custom_scheduler_commands": f"#SBATCH --mem-per-cpu={job_settings.mem_per_cpu}"})