I don't seem to have the hydra in my bin folder but I do have petscmpiexec that I've been using.

Use these, it will run the same method and sizes as the options I gave for ex22 before.

mpiexec.hydra -n 2 ./ex45 -da_grid_x 5 -da_grid_y 5 -da_grid_z 5 -da_refine 5 -ksp_monitor -pc_type mg -mg_levels_ksp_type richardson -mg_levels_pc_type sor -log_summary

Also, I want to install PetSc on an SGI machine that I have access to. I have been told that using MPT would give better performance compared to mpich2. When I configure petsc on this server I don't suppose

-with-mpi-dir=/opt/sgi/mpt

the above would work because of the different name. Do you have a suggestion as to what I could try?

Francis