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

You can use this load testing strategy to get a basis for your further load tests, or to assess how your server performs against the service-level agreement (SLA).

Your test should help you determine what response is normal for the server. You can then use these values to set up the assertion in other tests. You may also find server or target TestCase problems that would prevent longer load tests from running correctly. This is also a good way to check if your server performs according to the SLA.

Test Parameters

To create baseline tests, we recommend using the Baseline load test template. By default, it will create a test with the following parameters:

Parameter Value
Duration 10 minutes
Load type VUs
Simulated load 20 virtual users
Wait time One second
Warmup time 15 seconds
Assertions Time taken – Average
Time taken – Max
Created monitors CPU
Created statistics Two charts are created:


  • TPS

  • Time taken – Median

  • Time taken – 95% percentile

  • Running VU


  • Monitor CPU

  • Monitor Memory

If you simulate the Fixed load profile with the VUs load type, you specify the constant number of virtual users to be simulated.

If you simulate the Fixed load profile with the Rate load type, you define the constant speed at which new users arrive to the server.

To estimate the server performance, add assertions and server monitors that will check the response time, the size of transferred data and other values to which your SLA can refer.

Here is what your test results may look like:

API load testing with ReadyAPI: Sample baseline test

Click the image to enlarge it.

Assertions and Server Metrics

To examine 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

Fixed Profile
Load Test Editor Interface
LoadUI Licenses

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