Hi I am not sure whether this is the right mailing list to address this issue. Actually, I am a unix sytem admin, who has been requested to install MrBayes on our cluster. We have 4 SUN machines running Solaris 9. We have mpich-1.2.6 running and is being used extensively. We are not using passwordless ssh , but instead are using rsh. Students have not faced any problems in using mpich. Now I have installed the mpi version of MrBayes on one of the machines and then ran a program called sample.nex It gave me the following error p1_9962: p4_error: interrupt SIGSEGV: 11 I have not been able to find the reason and solution for that error. Any suggestions/ideas would be greatly appreciated. A lot of our research work depends on getting this to work correctly. If this is not the right mailing list, can any of you please direct me to the right mailing list to address this issue. Thanks in advance Shaila -- ***************************************************************** Shaila Parashar e-mail:shaila at engr.colostate.edu UNIX System Administrator tel:- (970)-491-6555 Engineering Network Services Colorado State University Fort Collins, CO 80523-1301 ****************************************************************** " Smile is a curve that sets things straight. "