Hi, (I sent this email a while ago but I use a different email address. Not sure if it got through since it's not registered in the server list. Sorry if it was resent.)
I obtain 2 linear eqns (u and v velocity) from the momentum eqn in my CFD code. Instead of solving eqn 1 in parallel, and then subsequently eqn 2 in parallel, I am thinking of solving the 2 eqns at the same time, using half the number of processors on each eqn. In other words, when using 4 processors, I use 2 processors for eqn 1 and 2 processors for eqn 2. Will that be possible? I thought that in MPI, if an equation is divided among too many processors, its scaling factor will decrease. So by dividing into less processors and solving them simultaneously, it will give better performance. Is that true? I've also successfully coded 1 eqn to be solved in parallel in PETSc. What changes do I have to made now? Thank you very much. Regards.
