On Mon, Dec 5, 2011 at 8:17 AM, Dominik Szczerba <dominik at itis.ethz.ch>wrote:
> I am on a Cray system, where I have configured and built petsc 3.2 p5 > myself, only using the vendor provided mpi, all the other packages > (parmetis, hypre, mumps) are built with --download-package. "Make ... > test" does not work here to verify the correct build because users do > not have access to mpiexec. So I do the test by hand, and I am unsure > about what I am getting. When executing the test ex19 with the > system's scheduler I get this output: > > lid velocity = 0.0204082, prandtl # = 1, grashof # = 1 > Number of Newton iterations = 2 > lid velocity = 0.0204082, prandtl # = 1, grashof # = 1 > Number of Newton iterations = 2 > > It's quite different from the expected output in ex19_1.testout: > > lid velocity = 0.0016, prandtl # = 1, grashof # = 1 > Number of Newton iterations = 2 > lid velocity = 0.0016, prandtl # = 1, grashof # = 1 > Number of Newton iterations = 2 > Are you running with the right options? -dmmg_nlevels 4 -snes_monitor_short Matt > Does it mean that I have screwed up the build somehow, or is this > somehow the effect of the batching system, or just numerical > uncertainty due to the parallel computation? Note: I get the same > result with 1 and a few MPI processes. > > Many thanks for any ideas. > > Dominik > -- What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead. -- Norbert Wiener -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20111205/24f01272/attachment.htm>
