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The set is created by the script https://github.com/futures/ff-fixtures/blob/master/create_random_files.sh which writes the files to objects/random and creates the necessary manifest-md5.txt file used by the JMeter Tests at https://github.com/futures/ff-jmeter-madness
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 with the same input file.
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Additionally a file manifest-md5.txt is generated which is employed by the JMeter tests to find the random binaries for uploading them via HTTP requests
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