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It works by using some standard GNU commands including dd, rm and md5sum and iterates over a list of integer filesizes in https://github.com/futures/ff-fixtures/blob/master/random_sizes.data in order to create one file per iteration of the given size in megabytes. This to a certain extend ensures the comparability of the measurements, since exactly the same number of files with the same number of bytes is created each time the data set is generated.
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