title: how to auto increase the number of concurrent users in jmeter
body: <p>I have a thread group with login request and try to doing concurrent users load for this request.
  I have recorded login scenario for single user and replacing other users using parameterization.
  For creating small no of users data in csv file is not an issue.But when trying to create 10k users is more difficult for csv file.
  Is there any way to do this simple?
  Means,simply change last value after user
  For example : user1@gmail.com,user2@gmail.com, user3@gmail.com........so on..upto 10k users<br>
  If i want to test for 1000, 10k users without changing manually users data and increase as much as users simply define 100 (for 100 users)?
  Is there any way?</p>