Difference between GraalVM and Jvm-Hotspot

Question

Can someone explain the differences between GraalVM and Jvm-Hotspot, and how GraalVM is related to OpenJDK's HotSpot.

Pleurisy

quick link: blog.frankel.ch/first-impressions-graalvm – Prescription

Answer 1

In that context you could think of GraalVM as a modified/improved HotSpot JVM [very loosely: OpenJDK's HotSpot + the Graal JIT Compiler (replacing the one from HotSpot) + the ability to run other languages (JS, Ruby, R, Python, etc.) + ability to AOT compile Java + additional bundled tools, etc.]

Immortality

Answer 2

GraalVM is a JVM with multiple change:

• the graal compiler. It is intended to replace the C2 compiler (server mode) in front of HotSpot.
• Truffle a library that you can implements to make JVM polyglot ( there already a number of language that are supported like js, R, Ruby...)

The graal project also have a Substrate VM which is a framework to build native artifact from Java.

Cocker

Answer 3

Detailed information about how Graalvm performs better than standard Hotspot and how to use it: https://www.baeldung.com/graal-java-jit-compiler

Servetnick

Answer 4

The main difference is that the C2 compiler is replaced with the Graal compiler.

GraalVM is a full-scale JDK distribution that can make Java applications run faster with a new advanced just-in-time compiler (Graal). As a platform it uses the Java HotSpot VM, so all tools and libraries that work on OpenJDK, work the same way on GraalVM JDK. In this context, GraalVM replaces the last-tier optimizing compiler in the JVM (C2) with the Graal compiler. This compiler is the outcome of 10+ years of research at Oracle Labs and includes several new optimizations, such as advanced inlining, partial escape analysis, code duplication, and speculative optimizations. GraalVM is itself written in Java, rather than C/C++, which simplifies maintenance and helps us develop and deliver new optimizations much faster.

Several companies, such as Oracle Cloud, Twitter, and Facebook are running large-scale Java applications on GraalVM JDK to increase performance, reduce resource usage, and lower deployment costs. GraalVM JDK can simply be used as a drop-in replacement for other JDKs — see how to get started.

Reference

Farron