Applies to ReadyAPI 2.7, last modified on May 14, 2019

Use peak testing to check how your server works during the busiest periods. Peak testing is similar to soak testing, but with a much heavier load and shorter duration.

Test Parameters

To create a peak test, use the Peak load test template. By default, it will create a test with the following parameters:

Parameter Value
Duration 60 minutes
Load type VUs
Simulated load Ramp Sequence, from 0 to the number of VUs defined by the user, 5 minute ramp up, 50 minute peak time, 5 minute ramp down
Wait time One second (500 ms for trial users)
Warmup time 10 seconds
Assertions Time taken – Average;
Time taken – Max;
Assertion failures – Per Second;

As an option, you can configure server monitors.

LoadUI will create a statistics chart for the load test.

Alternatively, you can create a load test with similar parameters manually.

Sample Test Results

Here is what your test may look like:

API load testing with ReadyAPI: Sample peak test

Click the image to enlarge it.

Assertions and Server Metrics

To estimate the server performance, you can track various server-side metrics or use assertions.

Server Metrics

With LoadUI, you can track various server-side metrics like memory and CPU usage, the number of database requests per second, and so on. To do this, you need to configure server monitors in your load tests. For detailed information, see the topics of the Server Monitoring section.

You can check metric data on the Server Monitoring and Statistics pages of the load test inspector.

The exact metrics to be checked depend on your server type and on the type of your server applications. For information on the available metrics, see Monitor Reference.


Below are some load test assertions that you may find useful in baseline tests:

Assertions Description
Test Target – Time Taken Lets you control the request simulation time.
Test Steps – <Test Step Name> – Time Taken
Load Test – Failures – Total Lets you check the total number of errors that occur during the test run.
Test Target -Failures – Total
Test Steps – <Test Step Name> – Failed
Test Steps – <Test Step Name> – Transactions Lets you monitor the number of simulated transactions.
Test Target – Throughput Lets you monitor the throughput (bytes per second or transactions per second).

See Also

Ramp Sequence Profile
Variance Profile
Fixed Profile
Load Test Editor Interface
LoadUI Licenses

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