To get the snapshots which are needed for testing, run the get sample data 

> ./

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 <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.