[jruby-user] Re: How to build from source?

christian wrote in post #1151838:
> after that you might want to in jruby-launcher gem
>
>      bin/jruby -S gem install jruby-launcher
>
> which gives you a faster startup for jruby command line execution.

I did that, but the script consisting of nothing but "puts 'Hellow
world'" still takes 6 seconds (and plenty of io) to execute:

% time jruby /tmp/hello.rb
Hello world
7.753u 0.777s 0:05.91 144.1%    0+0k 96+80io 0pf+0w

This is on RHEL6 with Oracle's JDK 1.7.0_55.

For comparison, with regular ruby the time is 1 hundredth of a second:
% time ruby /tmp/hello.rb
Hello world
0.007u 0.005s 0:00.01 0.0%      0+0k 0+0io 0pf+0w

I understand, that Java programs do carry the start-up penalty... But I
didn't realize, it is SO big. Am I benefiting from having jruby-launcher
at all -- or do I need to do something else for faster start-ups?
Thanks!

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