Hi Tiago: I got Segmentation fault when using minimize_blockmodel_dl to discover communities from a graph. The following is the output in the terminal: ------------------- *** Error in `*** Error in `python*** Error in `python': double free or corruption (out): 0x00007fe6a8000c30 *** *** Error in `python': double free or corruption (!prev): 0xpython': double free or corruption (!prev): 0x0000000051abe1a0 *** Segmentation fault ------------------- This happens when I specify the parameter parallel = True for the method minimize_blockmodel_dl. I am wondering whether this segmentation fault has something to do with the synchronization between threads when specifying the parallel = True parameter. The graph-tool I am using is 2.7 (commit ebd75c28, Thu Sep 17 23:25:50 2015 +0200). Is this fixed in the latest version? Thanks. Best Regards~ Hao -- View this message in context: http://main-discussion-list-for-the-graph-tool-project.982480.n3.nabble.com/... Sent from the Main discussion list for the graph-tool project mailing list archive at Nabble.com.