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How to improve jRuby load time?
When developing a site using jruby on rails I find it quite annoying that every time I invoke jrake db:migrate or rails g migration I have to wait a few seconds for the java engine to start...
$ time rails -v
Rails 3.0.0
real 0m6.947s
user 0m10.590s
sys 0m0.230s
Is there a way around this? Maybe I could install regular rails too and use its toolset; that would probably work to some extent except that jrails and rails connect to the database differently. Is there no way to have a java VM running on standby somehow to avoid the expensive startup?
Addendum: maybe it isn't java's or jruby's fault? Maybe it's just rails'?
$ time echo 1+1 | jirb
1+1
2
real 0m0.930s
user 0m1.090s
sys 0m0.040s
$ time echo 1+1 | rails c
Loading development environment (Rails 3.0.0)
1+1
2
real 0m14.719s
user 0m22.080s
sys 0m0.600s
14 s is a long time to wait... :(