Print ompi_info

Author: Kyle1668

deepspeed/launcher/multinode_runner.py

@@ -85,7 +85,11 @@ def __init__(self, args, world_info_base64, resource_pool):
 
     def backend_exists(self):
         #TODO: if IB is available we should suggestion mvapich
-        return shutil.which('ompi_info')
+        exists = shutil.which('ompi_info')
+        if not exists:
+            warnings.warn("ompi_info does not exist, openmpi is not installed properly")
+
+        return exists
 
     def get_cmd(self, environment, active_resources):
         #TODO: Allow for include/exclude at node-level but not gpu-level