Hi! I am intending to use the Parallel construct from the joblib library which basically runs an embarassingly parallel for loop via the multiprocessing facility. The error I get is Traceback (most recent call last): File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/threading.py", line 522, in __bootstrap_inner self.run() File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/threading.py", line 477, in run self.__target(*self.__args, **self.__kwargs) File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/multiprocessing/pool.py", line 225, in _handle_tasks put(task) RuntimeError: Pickling of "graph_tool.libgraph_tool_core.Vertex" instances is not enabled (http://www.boost.org/libs/python/doc/v2/pickle.html) I thought graph-tool graphs are compatible with Python pickle-stuff - or do I have to watch out somewhere? Thanks for the help, -- Sebastian Weber Group of Cell Communication and Control Freiburg Institute for Advanced Studies - FRIAS School of Life Sciences - LIFENET Albert-Ludwigs-Universität Freiburg Albertstr. 19 79104 Freiburg T.: +49-761-203-97237 Fax:+49-761-203-97334