==Benchmarking JRuby== The current popular way to benchmark JRuby performance is to perform a gem installation of Rake. The install process exercises a number of APIs and represents a fairly general-purpose application of Ruby. It's also extremely interpreter-heavy. After getting a build of JRuby, as above, the following steps can be used to benchmark JRuby using Gem and Rake: *Fetch the current Rake gem from [http://rubyforge.org/frs/?group_id=50 RubyForge] *Execute the following command (putting JRUBY_HOME/bin in your path or referencing it directly): JRUBY_HOME/bin/gem install <rake gem file> *By preceding this command line with the unix "time" command you can test end-to-end performance. Of course there are other ways to wire in profiling and performance-monitoring tools that won't be detailed here. A sample run from a MacBook Pro under Apple's Java 6 JVM is shown below: Nutters-Computer:~/Documents/workspace/jruby headius$ time bin/gem install rake-0.7.1.gem Successfully installed rake, version 0.7.1 Installing ri documentation for rake-0.7.1... Installing RDoc documentation for rake-0.7.1... real 0m52.596s user 0m51.740s sys 0m2.146s