spec

Spec Graal

Tests for using the Clojure spec.alpha library with GraalVM native-image.

Usage

Currently testing:

[org.clojure/spec.alpha "0.2.187"]

We can successfully build the native image at target/spec-graal with:

$ lein do clean, uberjar, native, run-native

The following is equivalent:

$ lein do clean, uberjar
$ native-image \
      --report-unsupported-elements-at-runtime \
      --no-server \
      --initialize-at-build-time \
      -jar ./target/spec-graal.jar \
      -H:Name=./target/spec-graal

Using tools.deps, the native image can be built as follows:

$ clojure -A:depstar -m hf.depstar.uberjar target/spec-graal.jar -C -m spec-graal.main
$ native-image \
      --report-unsupported-elements-at-runtime \
      --no-server \
      --initialize-at-build-time \
      -jar ./target/spec-graal.jar \
      -H:Name=./target/spec-graal

Speed difference:

$ time ./target/spec-graal
Hello GraalVM with Spec! Btw, 'Spec Graal' is a valid ::title.
0.00 real         0.00 user         0.00 sys

$ time java -jar ./target/spec-graal.jar
Hello GraalVM with Spec! Btw, 'Spec Graal' is a valid ::title.
0.95 real         1.86 user         0.19 sys