Hi guys, i'm new with MPI and i got some problem to transform a serial code into parallel code, please see here for thecode http://stackoverflow.com/questions/18743721/mpi-bordered-block-system-matrix... Here the GDB error: http://bpaste.net/show/tDDBNTyqVpUjxFUF3qSr/ I'm sorry for the Italian comments, please ignore it. Btw the code should be clear. Thanks so much in advance. Have a nice day guys! -- Best Regards, Mauro Crociara