From: Chad Fowler <chadfowler@...>
Date: 2005-05-16T01:51:49+09:00
Subject: Re: Why is this DRb code so slow?

On 5/15/05, Jim Freeze <jim@freeze.org> wrote:
> Ok, I'm stumped. I have a simple drb example, and it is
> taking about 1 minute to get the value of an array with
> two items in it.
> 
>   % cat simple-server.rb
>   require 'drb'
> 
>   def start_daemon
>       if (child_pid = fork)
>         File.open(__FILE__+".pid", "w") { |f| f.puts child_pid }
>         exit
>       end
>       Process.setsid
>     end
> 
>   start_daemon
> 
>   class MyClass
>     def files
>       %w(test1 test2)
>     end
>   end
> 
>   DRb.start_service nil, MyClass.new
> 
>   puts DRb.uri
>   File.open(__FILE__+".uri", "w") { |f| f.puts DRb.uri }
>   puts "Server started"
>   DRb.thread.join
> 
>   % cat simple-client.rb
>   require 'drb'
>   DRb.start_service
> 
>   server = File.read("simple-server.rb.uri").strip
>   puts "Connecting to #{server}"
> 
>   begin
>     robj = DRbObject.new nil, server
>     p robj
>     p robj.object_id
>     p robj.files
> 
>   rescue DRb::DRbConnError => err
>     puts "No response from server"
>     puts err
>   end
> 
>   % ruby simple-server.rb
>   druby://cheetah.local:49506
>   Server started
> 
>   % ruby simple-client.rb
>   Connecting to druby://cheetah.local:49506
>   #<DRb::DRbObject:0xb257c @ref=nil, @uri="druby://cheetah.local:49506">
>   365246
>   ["test1", "test2"]
> 
> The last line takes about a minute to be printed.
> 

I don't know, but:

$ time ruby simple-client.rb 
Connecting to druby://chad-fowlers-computer.local:51624
#<DRb::DRbObject:0x25639c
@uri="druby://chad-fowlers-computer.local:51624", @ref=nil>
1225166
["test1", "test2"]

real    0m0.215s
user    0m0.030s
sys     0m0.017s

-- 

Chad Fowler
http://chadfowler.com
http://rubycentral.org 
http://rubygarden.org 
http://rubygems.rubyforge.org (over 300,000 gems served!)