Have fun Anton

graalvm-in-docker.txt

$ sbt new http4s/http4s.g8 --branch 1.0-scala3 
// use all the defaults, just set sbt to 1.9.9

$ cd quickstart

$ sbt assembly

$ cat Dockerfile # create this file with these contents:
FROM ghcr.io/graalvm/jdk-community:22
RUN mkdir /opt/app
COPY target/scala-3.3.3/quickstart-assembly-0.0.1-SNAPSHOT.jar /opt/app/http4s.jar
CMD ["java", "-jar", "/opt/app/http4s.jar"]

$ docker build . -t http4s:graalvm

$ docker run -d -m 250m -p 8080:8080 http4s:graalvm

$ wrk -t5 -c25 -d15s http://127.0.0.1:8080/hello/fren
Running 15s test @ http://127.0.0.1:8080/hello/fren
  5 threads and 25 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency     4.37ms    5.23ms  85.59ms   96.15%
    Req/Sec     1.36k   221.39     1.63k    86.67%
  101463 requests in 15.05s, 15.19MB read
Requests/sec:   6741.57 <<<<<<<<<< HTTP4S GOES BRRRRRRRRR
Transfer/sec:      1.01MB

$ docker ps -a | grep http4s 
3db82b1cf410   http4s:graalvm                        "java -jar /opt/app/…"   6 minutes ago   Up 6 minutes   0.0.0.0:8080->8080/tcp                           great_greider

// DID NOT CRASH UNDER LOAD, -m 250m, thank me later

I love the myth that Scala can't go fast in low mem environments 😆