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What is Pacing and how it's different from the Think Time

Pacing is the time that will hold/pause the script before it goes to the next iteration. i.e Once the Action iteration is completed the script will wait for the specific time(pacing time) before it starts the next one. It works between two actions. eg, if we record a script there will be three default actions generated by the Load Runner: vuser_init, Action, and vuser_end, the pacing will work after the Action block and hold the script before it goes to repeat it.

The default blocks generated by LoadRunner is shown below:

Actions marked in Red

Think Time: It replicates the real-time user behavior by adding a delay between two actions/transactions. 

In one of the interviews, I was asked if we give think time at the end of the script it will also work as Pacing then why HP has given two different parameters for the same purpose.

Each of them has a different purpose: Think Time will keep the thread active and LoadRunner will expect for another transaction, however, in pacing there won't be any active thread waiting for the next transaction and the thread will be in a rest state.

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