These scripts will help get the best from wg/wrk (https://github.com/wg/wrk)
Example:
$ head useragents.lst
Mozilla/5.0 (PLAYSTATION 3; 3.55)
Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; Trident/6.0; Xbox; Xbox One)
Mozilla/5.0 (Windows NT 10.0; Win64; x64; Xbox; Xbox One) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2486.0 Safari/537.36 Edge/13.10586
Mozilla/5.0 (PlayStation 4 1.51) AppleWebKit/536.26 (KHTML, like Gecko)