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It works by using some standard GNU commands including dd, rm and md5sum and iterates over er the filesizes in https://github.com/futures/ff-fixtures/blob/master/random_sizes.data in order to create one file of the given size in megabytemegabytes.
In order to create the binary test data set checkout the project https://github.com/futures/ff-jmeter-madness first:
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