Graal: How to use the new JVM JIT compiler in real life

on YouTube ↗41m

" summary

Graal is the Java-written JIT now available via JDK 9’s JVMCI and JDK 10’s JEP 317 and can be enabled with -XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI -XX:+UseJVMCICompiler or precompiled with jaotc (JEP 295). It bootstraps lazily at tier 4, compiles roughly ~5,000 Graal methods which adds about ~600 ms extra startup in tests, allocates compilation memory on the Java heap (risk of OOME without heap isolation), and in Twitter/Scala runs reduced CPU ~10% and showed up to ~40% faster runtime with p99 latency down ~20% in demos.

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" chapters (8)

1. 0:00Introduction and setup
2. 5:19What is Graal VM
3. 11:46Why use Graal at Twitter
4. 15:17Enabling Graal in HotSpot
5. 22:33Bootstrapping Graal
6. 27:53Java heap usage with Graal
7. 33:55Performance benchmarks
8. 39:43Summary and call to action

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