What makes you think they aren't executing? We'll need more information and a way to reproduce the problem in order to provide any help. ________________________________________ From: [email protected] [[email protected]] on behalf of Soheil Hooshdaran [[email protected]] Sent: Thursday, December 19, 2013 9:51 PM To: Balaji, Pavan Cc: [email protected] Subject: [mpich-discuss] fairness Hello. In my MPI program, some processes seem not to execute at all. How to overcome this problem? Regards Soheil Hooshdaran