jRuby
by Hubert Łępicki
@hubertlepicki
jRuby
- implementation of Ruby on JVM
- compatible with 2.0 syntax
- no GIL
- threads
- runs on windows
- deploys to Java infrastructure
Problems
- slow startup time
- incompatible gems / libraries
- somehow lags behind in features compared to MRI
Advantages over MRI
- access to Java & JVM libraries/frameworks
- allows access to Ruby from Java & JVM
- integrates with Java montioring/profiling tools
Cool jRuby projects
- Torquebox
- vert.x
- puma
What about hosting?
- Heroku!
- Any Java hosting really
- Any dedicated hosting
- Any VPS
Just have enough RAM
Torquebox
http://torquebox.org
Vert.x
http://vertx.io
Synchronous vs Async
- i/o and database access APIs
- message bus
- integration with JavaScript
- clustering
Ruby web servers
- Threads!
- Threads :(
- Puma
- Trinidad
- Jubilee
Performance
- JIT
- slow startup
- slow warmup
- suddenly insanely fast
Project Gral
"The aim of this project is to expose VM functionality via Java APIs. Namely, we want to make it feasible to write in Java a dynamic compiler and interpreter for a language runtime. These components will seamlessly integrate and leverage existing VM infrastructure (e.g., HotSpot)."
Truffle
"The Truffle runtime of JRuby is an experimental implementation of an interpreter for JRuby using the Truffle AST interpreting framework and the Graal compiler. (...) The goal is to be both significantly faster and simpler than other high performance implementations of Ruby."