Troubleshooting Memory Use - for when your application seems to use too much memory on JRuby.
Improving Startup Time - tips and tricks for improving startup time.
There is a report that GC may not work correctly. Set
-Djruby.native.enabled=false to avoid this problem.
At the time of this writing we don't ship
libjruby-cext.so in the jruby-jars gem. (That might be grounds for filing a bug/improvement ticket; please update this page if you decide to file one.)
To work around that fact, you'll need to do the following:
libjffi-1.0.soout of the JRuby binary distribution's
lib/native/[platform]directory. Be sure to choose the right directory for your platform.
/opt/jruby/lib), and either modify the places where
ld.solooks for libraries to add that path or set LD_LIBRARY_PATH (or equivalent) to use that path before launching the JVM process that uses JRuby (Tomcat/application server etc.).