Hi All, I am simulating a large device using MEEP 1.1.1 with OpenMPI and parallel hdf5 support on the Amazon cloud (7 nodes, 1708 GB RAM, 28 cores used [using more cores appears to decrease performance]). My computational cell is 161x411x15.05 (a=1um). The device consists of 150,000+ cylinders with radii ranging from .145 um to .33 um. I have run the simulation successfully at resolution 5. At resolution 14, all is well until sub-pixel averaging finishes. below is the relevant part of the error message.
... > subpixel-averaging is 78.5038% done, 1.09568 s remaining > subpixel-averaging is 85.7806% done, 0.663234 s remaining > subpixel-averaging is 93.2841% done, 0.288219 s remaining > time for set_epsilon = 311.675 s > ----------- > meep: Source width > cell width in x direction! > -------------------------------------------------------------------------- > MPI_ABORT was invoked on rank 0 in communicator MPI_COMM_WORLD > with errorcode 1. > > NOTE: invoking MPI_ABORT causes Open MPI to kill all MPI processes. > You may or may not see output from other processes, depending on > exactly when Open MPI kills them. > -------------------------------------------------------------------------- > ... > I have no idea why I get the " meep: Source width > cell width in x direction!" error only high resolution. I have checked in interactive mode that the source width is in fact less than the cell width (source is 150 um in x direction). I am using an amplitude function to define a gaussian source with correct phase fronts perpendicular to the propagation direction. Is there anything I can do to fix this? Let me know what other information would be helpful. Thanks! Alex Ball
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