Comment (by Michal Pirog):

There is a new directory DNSdata/test/ now. It contains minimal initial data for Einstein Toolkit testing. They are: "BNSdata_properties.txt", "checkpoint.0" (4.2M), and "test.par". All of them are necessary, but only "checkpoint.0" has a size in MB, the other two are in KB. The file "et.par" is a parfile for Cactus. It needs a path to this directory to be set as: DNSdata::sgrid_datadir = "path_to_the_directory/test". I'll appreciate your feedback here.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2747/inclusion-of-sgrid-importer-in-einstein