What is Maelstrom?

https://github.com/jepsen-io/maelstrom

Gossip Glomers Challenges?

https://fly.io/dist-sys/

ZIO-Maelstrom?

https://zio-maelstrom.bilal-fazlani.com/

1. Maelstrom should be installed and should be available in PATH
2. Coursier should be installed and should be available in PATH
3. GraalVM Community Edition with native-image tool should be installed
4. sh / bash should be available

This is a template repository. Use the below option to create your own repo using this template.

Using running jar files does not work because they start too slow and the tests timeout. So, we need to compile them to native binaries using graalvm

There are three custom (and useful) commands available on every solution subproject:

1. bootstrap

   bootstrap command uses coursier cli to build a fat jar will all dependencies. It also create a maelstrom runner script testjar.sh file which can be used to run the jar file via maelstrom with expected load for the challenge.

   #replace with the challenge you want to package
   sbt efficient-broadcast-1/bootstrap

   You can now run testjar.sh script from target directory

   ./efficient-broadcast-1/target/testjar.sh

2. maelstromRunAgent

   In order to create a native binary, we first run the java application (single node) with a very small load from maelstrom. Using command maelstromRunAgent. This runs with graalvm agent and generates reflection configuration in resources/META-INF/native-image/

   Reflection configurations don't change very often. So, we can reuse them for future compilations.

3. nativePackage

   After reflection configs are generated, we can now compile the application to a native binary using nativePackage command. This task also creates a test.sh file which can be used to run the native binary via maelstrom with expected load for the challenge.

   #replace with the challenge you want to compile
   sbt efficient-broadcast-1/maelstromRunAgent
    
   sbt efficient-broadcast-1/nativePackage

   You can now run test.sh script from target directory

   ./efficient-broadcast-1/target/test.sh

• Take a look at build.sbt to get familiar with the build setup
• This is template tested on MacOS. Linux should be supported too. Windows might require minor tweaks
• You may have to change nativeImageGraalHome in build.sbt to point to your graalvm home directory
• Recommended to use latest Graalvm CE version