To get the snapshots which are needed for testing, run the get sample data script > ./get_sample_data.sh this will wget the appropriate files from Dropbox. Next, you can run sph2grid using any of the example config files in the directory example_config. The results will go into example_output. The command to start sph2grid takes the following form, > mpirun -n <num_pe> python sph2grid.py <config_file> where <num_pe> is the number of processors you want to use and <config_file> is the name of the config file you want to use. Note that the number of files a snapshot is divided into should be a multiple of the number of processors used.