LR Cloud ramp up and duration question

Question

I'm getting confused with ramp up and duration while defining a test. I have a test with a single WebHTTPHTML script. When I replay the script in VuGen, it takes a few seconds. 
 
 Here are the test parameters 
 - 500 Vusers 
 - 15 mins ramp up 
 - 30 mins test duration 
 - 2 OPLGs 
 
 Here are my questions 
 
 1. My goal is to spread 500 users evenly across the 30 mins of test duration. I'm trying to understand how the VUsers are spread out during a test 
 2. What does ramp up mean? Once the test starts and lets say I have 50 VUsers, does it mean there are 50 sessions executing the test script? 
 3. Once all 500 Vusers finish exeucting the scripts (lets say in 10 mins), what is happening in the last 20 mins of the test. 
 
 Thanks.

JHF Remmelzwaal · Answer

Naveen Garg , 
 The Ramp Up is the 'Login phase' of your script. Your application (and LG) will likely break when you try to login with all the users in the same single second. During your test duration you execute the load (run the script) in a steady state. Most common is to design a script with a repeating test flow. Give your script a fixed run interval (Pace time) so the load you generate is predictable (i.e. N transactions per second). 
 When your scripts only run for 10 minutes and then stop and the test duration is 30 minutes, the test will stop after 10 minutes. 
 Try to understand more about Run Time Settings: Pace time, Think Time, Run Logic and Browser Emulation. Also the various Schedules are important. Some schedules might overrule the 'Run Logic' settings and take the test-time as leading. 
 This is fundamental for using LRP / LRE. Take time to read of lookup YouTube movies about this subject. You can without much trouble look to LRP versions of 12.x as well for this has not changed over the years.

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