improve process safety for some io utility functions

hysop/tools/io_utils.py

@@ -49,7 +49,10 @@ class IO(object):
     @requires_cmd('stat')
     def get_fs_type(path):
         cmd = ['stat', '-f', '-c', '%T', path]
-        fs_type = subprocess.check_output(cmd)
+        fs_type=''
+        if mpi.main_rank==0:
+            fs_type = subprocess.check_output(cmd)
+        fs_type = mpi.main_comm.bcast(fs_type, root=0)
         return fs_type.replace('\n', '')
 
     @classmethod
@@ -148,7 +151,8 @@ class IO(object):
             raise RuntimeError(msg)
         if not os.path.exists(cpath):
             try:
-                os.makedirs(cpath)
+                if mpi.main_rank==0:
+                    os.makedirs(cpath)
             except IOError:
                 pass
         return cpath