Launch.md

Launch

You can find some examples in ./Examples. See Input & Output for details about load and save of files. All supported command line parameters can be found in Settings.inc.h.

Parallel Mode

To launch multiple processes (MPI) just build with parallel support:

mpiexec -n <N> ./fdtd3d --cmd-from-file cmd.txt

To launch computations on GPU pass next parameters to fdtd3d:

--use-cuda
--cuda-gpus <gpu_id>
--num-cuda-threads x:<Nx>,y:<Ny>,z:<Nz>

If you want to use both MPI and Cuda, specify GPU id to be used on each computational node, or -1 for CPU computations on the selected node. Buffers should be at least of size 2 in this mode:

--use-cuda
--cuda-gpus <gpu_id1>,<gpu_id2>,...,<gpu_idN>
--cuda-buffer-size 2
--buffer-size 2
--num-cuda-threads x:<Nx>,y:<Ny>,z:<Nz>