title: Best way to run dockers parallelly
body: <p>I have a docker image that receives an argument and runs for roughly a minute.<br />
  From time to time I need to run it over a set of 10K-100K inputs.<br />
  I tried doing this using AWS Batch, but it ran very slowly, since at each given moment only few dockers ran.</p>
  <p>Is there an easy alternative which allows configuring number of dockers to run simultaneously and thus controlling the over all run time?</p>