From ae20f5ffe67f8d348b47a757b1e511eaa24c797f Mon Sep 17 00:00:00 2001
From: Martin Diehl <m.diehl@mpie.de>
Date: Mon, 3 Aug 2020 18:19:38 +0200
Subject: [PATCH] attempt to fix parallel writing on MacOS

should resolve TypeError: cannot pickle
'vtkmodules.vtkIOXML.vtkXMLRectilinearGridWriter' object error
---
 python/damask/_vtk.py | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/python/damask/_vtk.py b/python/damask/_vtk.py
index 51175fdd7..00aa2f4e9 100644
--- a/python/damask/_vtk.py
+++ b/python/damask/_vtk.py
@@ -190,9 +190,13 @@ class VTK:
         writer.SetCompressorTypeToZLib()
         writer.SetDataModeToBinary()
         writer.SetInputData(self.geom)
+
         if parallel:
-            mp_writer = mp.Process(target=self._write,args=(writer,))
-            mp_writer.start()
+            try:
+                mp_writer = mp.Process(target=self._write,args=(writer,))
+                mp_writer.start()
+            except TypeError:
+                writer.Write()
         else:
             writer.Write()