Pacing in Apica Load Test and ZebraTester

There are two related but different concepts in load testing. Pacing and Think-time.

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In short, think-time is when there is a delay after each transaction and pacing is a delay at the end of the script.

Pacing

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Pacing in LoadRunner

In LoadRunner, pacing we have pacing option in runtime settings of LoadRunner there we can define the duration and the way it will be used.

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Example

To produce a transaction flow of 100K transactions every 10 minutes, set up a test with 500 VU with a script producing 10 transactions/iteration and a pacing time of 30 seconds.

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Note that the transaction flow will still follow a ramp-up. But, once all the VU’s are running, it will produce a steady flow of 100K transactions / 10 minutes even if the application response time doubles from 1s to 2s.
As long as the script iteration time is not exceeding the pacing interval of 30 sec, all is fine.

Pacing in ZebraTester (before/during Test Execution)

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The same functionality can be set up in ZebraTester using an Inner Loop around all pages in a script with pacing set to a fixed value of 30 seconds.

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