Ruby Forum JRuby > slow 'require' ?!

Hi,
I'm using JRuby 1.1.1 on Linux and performance after startup is very 
good.
But loading ruby libs by 'require' is very slow.
Sometimes I have to wait several seconds ...
-------------------------------------------
# TEST
def duration(&code)
  start_time = Time.now.to_f
  code.call
  Time.now.to_f - start_time
end

dur = duration { require 'pp' }
puts "require pp: #{dur}"

dur = duration { require 'yaml' }
puts "require yaml: #{dur}"

dur = duration { require 'rubygems'; require 'log4r' }
puts "require log4r: #{dur}"

# JRuby 1.1.1
# require pp: 0.303
# require yaml: 0.800
# require log4r: 0.677

# Ruby 1.8.6
# require pp: 0.015
# require yaml: 0.030
# require log4r: 0.058
-------------------------------------------

Any suggestions or hints??
Thanks

Andreas Hund

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On Fri, May 9, 2008 at 6:31 AM, Andreas Hund <ahund@ionosinst.de> wrote:
>  Time.now.to_f - start_time
>
>
> Any suggestions or hints??

On initial startup of JRuby many pieces of java code have not been
running long enough to get dynamic optimizations yet and requires
usually happen at the start of JRuby.  Our parser is also quite a bit
slower than MRI.  That may or may not explain the difference.  You
could help try and isolate what is taking the most time, but that
requires digging into the Java code and perhaps using a profiler to
see what is going on.

-Tom



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Blog: http://www.bloglines.com/blog/ThomasEEnebo
Email: enebo@acm.org , tom.enebo@gmail.com

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