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Date: Thu, 06 Sep 2012 08:44:48 +0200
From: Darshan Karandikar <li...@ruby-forum.com>
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Subject: [jruby-user] Re: Poor performance with JRuby on Rails

Suggest you to go through http://www.ruby-forum.com/topic/1119702 where 
I have shared my experience with JRoR. I also had faced performance 
issues in the beginning. Summarizing the configs that solved the 
problems for me:

1) Write thread-safe code and enable config.threadsafe! in Rails. Gave 
me the best performance and scalability.
2) Increase the AR conn. pool wait timeout.
3) Warm up AR conn. pool by either using AR-JDBC bridge OR following 
custom script (helps prevent the overhead of creating db conns at 
runtime which was one bottleneck in my case):

#db pool warmup

puts "db pool warmup starting...................... #{Time.now}"
warm_up_count = APP_CONSTANTS['dbconn_warm_up_count'].to_i
conn_array = Array.new
for i in 1..warm_up_count do
   conn_array[i] = ActiveRecord::Base.connection_pool.checkout
   puts 'chekedout '+i.to_s+'......................'
end

puts 'warmed up...........==============..............'
for i in 1..warm_up_count do
   ActiveRecord::Base.connection_pool.checkin(conn_array[i])
   puts 'chekedin '+i.to_s+'......................'
end
puts "db pool warmup done........................... #{Time.now}"

-- 
Posted via http://www.ruby-forum.com/.

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