Hello PETSc's users! I have a problem with my parallel program. If I run it with only one processor (mpirun -np 1...), everything is all right but if I use 2 processors (mpi -np 2...), the problem appears.
When I want to solve my matricial system through a solver, after having created my matrices without any hitch, I have the following problem: The two processes that are running in two different processors using 100% of CPU and 14.6% of memory each of them, end up using 0% of CPU and 14.6% of memory and, although the program doesn't break down, both of the processes don't do anything. This looks like a lockup: one processor is waiting for a message from the second one, but the second one thinks that it doesn't have to send anything and is instead waiting for something else from the first processor. But I don't know how to avoid this problem since it is supposed that I don't have to use "MPI_Send()" and "MPI_Recv()" functions because PETSc itself deals with it, do I?. Any advice will be welcome. Thanks in advance and best regards Isa