from Java and Scala to assembly by Jarek Ratajski

When it comes to performance, many developers take for granted statements (myths) that are not always valid, no longer correct, or were never accurate. Performance and benchmarking were always tough topics, and in languages such as java and scala, there are so many layers between code and machine that any analysis seems futile. We will, however, try to do this and check a few exciting examples of scala code snippets down to the "bare metal". We will use recent JVM versions, including graal and some valuable tools such as jitwatch, javap, gc logs, jmh, performance counters. The next time someone claims something about performance, you can measure and check it.