On Mon, 19 Apr 2010 12:31:04 -0500, Matthew Knepley <knepley at gmail.com> wrote: > On Mon, Apr 19, 2010 at 12:28 PM, Li, Zhisong (lizs) <lizs at > mail.uc.edu>wrote: > > > Hi, > > > > I think this is a beginner's question, but still hope someone can help me > > out. > > > > I've tried to run some PETSc examples and my own simple PETSc codes on my > > office's cluster as well as on Ohio Supercomputer Center's machine. At first > > I found no speedup for parallel processing and later I noticed by checking > > the rank that actually each node is doing the same sequential processing. > > I'm sure the codes are parallel codes (such as ex19.c in SNES and ex7.c in > > TS tutorial codes). Is there anything I am missing in the installation or > > the run command such as"mpiexec -n 3 ex7"? How can I realize a parallel > > running? > > > > The mpiexec in your path is not the one you configured with. What > MPI is begin used?
Does make test run successfully? If so, then $ cd src/snes/examples/tutorials && make -n runex5 will tell you which mpiexec PETSc is using. Jed
