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

What is pacing?

Pacing is the wait between two iterations of a script. Once an iteration finishes, the script pauses for a set amount of time (the pacing time) before it starts the next one.

When you record a script, LoadRunner generates three default blocks: vuser_init, Action and vuser_end. Pacing takes effect after the Action block, holding the script back before it repeats.

The default blocks LoadRunner generates are shown below.

Default LoadRunner actions: vuser_init, Action and vuser_end, marked in red

Actions marked in red

What is think time?

Think time copies real user behavior by adding a delay between two actions or transactions, like the pause a person takes before clicking the next link.

Can think time replace pacing?

In an interview, I was once asked: if you add think time at the end of a script, won't it work as pacing too? If so, why did HP provide two separate settings for the same job?

They are not the same, because each has a different purpose. With think time, the thread stays active and LoadRunner waits for the next transaction. With pacing, no thread is waiting for a transaction. The thread rests until the next iteration begins.

 Think timePacing
PurposeImitates the pause a real user takesSets the wait before the next iteration
Where it appliesBetween actions or transactionsAfter the Action block, before the script repeats
Thread while waitingActive, expecting the next transactionAt rest

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