Adding new performance testing simulations

Simulation coding guideline

• New simulations can be added to the ./performance-test/src/gatling/java/org/opensearch/dataprepper/test/performance folder.
• Simulations are written in Java.
• Use a class name that describes what type of scenario your simulation is designed to simulate and end with a Simulation suffix.
• Simulations are executed using the Simulations classes static function.
• Test results must be repeatable. No element of the test should depend on a random element.

Adding command line parameters

Define static final variables within the simulation class itself.

• For integer parameters use Integer.getInteger(name [, default])
• For string parameters use System.getProperty(name [, default])

// Integer
private static final Integer targetRps = Integer.getInteger("targetRps");
// Integer with default value
private static final Integer maxUsers = Integer.getInteger("maxUsers", 1000);
// String with default value
private static final String targetHost = System.getProperty("targetHost", "http://localhost");

Parameters can be set from the command line using the -D flag

./gradlew :performance-test:gatlingRun -DtargetRps=100 -DmaxUsers=10 -DtargetHost=127.0.0.1