Load Testing - Perf and Profiling stuff

List of Tools

• JMeter
• Gatling
• JMH - open JDK performance tester with lots of JUnit Parallels - http://openjdk.java.net/projects/code-tools/jmh/
• YourKit - JDK Profiler
• Really good low latency profilers
  • https://github.com/async-profiler/async-profiler
  • https://github.com/glowroot/glowroot

Gatling

Open-Source load test runner. Has paid version too called Frontline. Based on Scala + Akka

• Link to Gatling docs - https://gatling.io/docs/current/http/http_protocol/
• Interesting article about adding a protocol (maybe old though) - https://www.trivento.io/write-custom-protocol-for-gatling/
  • https://github.com/jgordijn/lambda_gatling_test
• Link to an issue with a jenkins gatling plugin - https://github.com/gatling/gatling/issues/3407
• And some protocol extensions examples;
  • https://gatling.io/docs/current/extensions
    • Git commands one - https://github.com/GerritForge/gatling-git
    • JDBC one - https://github.com/rbraeunlich/gatling-jdbc

Gatling Feeders

Using Feeders we can parameterize tests using various sources of data - DB, file etc.

• Gatling docs - https://gatling.io/docs/current/session/feeder/
  • Example in tutorial - https://gatling.io/docs/current/advanced_tutorial/
• Examples - https://chercher.tech/gatling/gatling-feeders
• https://stackoverflow.com/questions/35730086/how-can-i-turn-a-simple-iterative-loop-into-a-feeder-in-gatling

JMeter

The original open source load tester.

List of TODOs for this section

• Add links to JMeter docs + examples
• Add example of the nice report :)
• Investigate adding a protocol other than http
  • https://jmeter.apache.org/usermanual/jmeter_tutorial.html