From: domingo@... (Domingo Alvarez Duarte)
Date: 2002-04-03T19:15:19+09:00
Subject: Re: Cutting 120 ms in mod_ruby,postgresql on an AMD500

Sorry but I've got an error using cgi/session when there is no cookie
already seted in the browser to correct it do the following in
cgi/session initialize:
------------------------
        id, = request[session_key]
        unless id
          #id, = request.cookies[session_key] # original line
#comment the above line and add the lines bellow to next comment
          begin
            id = request.cookies[session_key].value[0] #DAD
          rescue NameError
            id = nil
          end
#end new code
        end
--------------------------
As well looking at delegate.rb I could see that doing a small change
we can improve the performance of it (but still is too much for me, it
decreases the time spent on it 25%).
In Delegate::initialize 
--------------------------
#add the line bellow to store the methods definitions and 
# skip call eval one time for each one
    eval_methods = ''
    for method in obj.methods
      next if preserved.include? method
# here store the methods definition all together to evaluate
# all once at the end
      eval_methods << <<-EOS
        def self.#{method}(*args, &block)
          begin
            __getobj__.__send__(:#{method}, *args, &block)
          rescue Exception
            $@.delete_if{|s| /:in `__getobj__'$/ =~ s} #`
            $@.delete_if{|s| /^\\(eval\\):/ =~ s}
            raise
          end
        end
      EOS
    end
# and here outside the loop evaluate all methods at once
# with around 25% less cpu time
    eval(eval_methods)

------------------
The above could make a general performance improvement in ruby
programs that relay heavilly on delegation.

Again I hope that this will help someone.