Leading Edge! Changing the Java World
summary
JRuby maps Ruby to the JVM using concrete JVM features: invokeDynamic -> 2x–4x speedup on benchmarks and combined with Graal JIT yields up to 15.7x; Project Loom’s virtual threads let JRuby run massive fiber workloads (demo: 100,000 fibers in ~0.5s). Native interop moves from layered JNI to Project Panama with jextract for generated bindings. Startup remains the main gap (10–100x slower), with --dev, CRIU/Semeru snapshotting and early Leiden work as partial remedies.
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chapters (7)
- 0:00Introduction and JRuby history
- 8:29Dynamic features in Ruby
- 12:01Invoke Dynamic in JVM
- 21:11Fibers and Project Loom
- 30:00Native functions with Project Panama
- 41:33Startup and warm-up challenges
- 50:39Future improvements and wrap-up
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