Use cyclic exclusive srun step allocation

param_runner/executors.py

@@ -173,7 +173,7 @@ class SrunExecutor(BaseExecutor):
     def run_cmd(self, cmd, stderr_file, stdout_file):
 
         cpus_per_task = self.params.vals['cpus_per_task']
-        srun_cmd = "srun -N1 -n1 -c%d %s" % (
+        srun_cmd = "srun --exclusive -N1 -n1 --cpus-per-task=%d --distribution=cyclic %s" % (
          cpus_per_task, cmd['__command']['value'])
 
         ret = call(srun_cmd, shell=True, stderr=stderr_file,