Hello, I think I am writing to the correct mailing list. I need help as my code is if it runs for a long time on a Suncluster with MPICH-1.2.6 gives the following error in the output file. p10_5854: p4_error: : 975 Is this error due to system problem or due to deficiency in my code? Any help will be greatly appreciated. Thanks in advance. regards, Subir