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A Performance Test in IBM Rational Integration Tester can either be set to Constant Growth or Externally Defined. We can use Constant Growth if the load is going to increase by the same amount during each test phase, or we can Externally Define how the load will change throughout the test. This is particularly useful if we want to vary how much to increase (or decrease) the load by for each test phase. The other advantage of externally defining the load profile is if we want to suddenly increase the load, such as a spike test. An example graph of the load could look something like this –

Along the x axis we have time, and amount of messages per second along the y axis. We would not be able to set these without using an externally defined load profile. Setting up the externally defined load profile is simple; it only requires a datasheet with two columns – time and messages per second. Import it into Rational Integration Tester, set which columns to read from and away you go.

Posted by:jonathan
jonathan
Consultant, StarBase
Jon joined StarBase as a graduate in 2011. His main areas of expertise are in using HP performance testing tools such as ALM and LoadRunner, but he also has experience using IBM’s Rational Test Workbench (formerly Green Hat Tester), which he has used when working for high profile clients in sectors including financial services. He has also been involved in research into new testing tools and methodology and has developed training materials for newer recruits to the company.

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