# Run simulations sequentially with a script or batch file

## Running FDTD simulations sequencially using a script or batch file

• This comes handy when you want to run alot of simulations and leave it running in the background with only using the FDTD Engine licenses.
• We will be using the bundled script or batch file found in the following:
• #### Windows:

"C:\Program Files\Lumerical\2020a\bin\fdtd-run-local.bat"

• #### Linux:

/opt/lumerical/2020a/bin/fdtd-run-local.sh


## Run the simulations in 3 steps

1. Store you simulation files into a folder where you have full access (read/write).
Example
Windows: C:\Users\myusername\mysimulations
Linux: /home/myusername/simulations
2. Change to the directory of your simulations.
3. Run the simulations in sequence using the script.
• #### Run with 16 cores on Windows:

cd C:\Users\myusername\mysimulations
"C:\Program Files\Lumerical\2020a\bin\fdtd-run-local.bat" -n 16 *.fsp

• #### Run with 8 processes for all simulations on Linux:

cd  /home/myusername/simulations
/opt/lumerical/2020a/bin/fdtd-run-local.sh -n 8 *.fsp