README.md

Native compilation workshop in Java

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Measurement considerations

⚠️ All measurements are highly dependent on the characteristics of my computer. So feel free to replay the commands to make up your own mind.

We use the time command to measure performance (execution time and memory consumption).

The use of this command differs depending on whether you're running MacOS or Linux :

• MacOS

$ TIMEFMT+=' %M kb rss'
$ time <COMMAND>
#0,00s user 0,00s system 0% cpu 1,014 total 1168 kb rss

• Linux

$ /usr/bin/time -f "%E real,%U user,%S sys, %M kb rss" <COMMAND>
#01.03 real,0.00 user,0.00 sys, 1648 kb rss

In the output of the time command, there are 2 elements of interest to us :

• Program execution time (real or total) -> <VALUE> real or <VALUE> total

Startup Time = Program Execution Time - Solution Time

• Solution Time : Time taken for user code to be executed
• Program Execution Time: Total program run time (runtime startup time + Solution Time)

• Memory consumption of the executed program -> <VALUE> kb rss

Content

1. Basic compilation in Java 👉🏼 How the JIT Compiler works
2. GraalVM JIT Compiler 👉🏼 Installing and testing GraalVM JIT
3. GraalVM AOT Compiler 👉🏼 Discover the Ahead Of Time (AOT) compilation with GraalVM
4. Spring Boot Native - AOT 👉🏼 Discover the Ahead Of Time (AOT) compilation with Spring Boot + GraalVM
5. Quarkus Native - AOT 👉🏼 Discover the Ahead Of Time (AOT) compilation with Quarkus + GraalVM
   • CLI with Quarkus Native - AOT 👉🏼 Discover the Ahead Of Time (AOT) compilation with Quarkus + GraalVM + Picocli