check spawn

grisinv/invert.py

@@ -213,6 +213,7 @@ def vfisv(
     vfisv_data = VFISVpackage(path, id, line, width)
 
     # Spawn jobs to the grisinv:master+slaves
+    print('spawning on',numproc)
     pycomm = MPI.COMM_SELF.Spawn(get_executable(), maxprocs=numproc)
 
     # Merge intercommunicator