From: Marcin Raczkowski <swistak@...>
Date: 2007-05-13T19:17:28+09:00
Subject: Re: DRb connection error with more than 250+ DRb services

On Friday 11 May 2007 08:25, J. Wook wrote:
> Simple test codes are here:
>
>
> class TestServer
>   include DRb::DRbUndumped
>
>   def initialize
>     @obj = Array.new
>   end
>
>   def register(addr)
>     @obj << addr
>   end
>
>   def sum
>     s = 0
>     @obj.each do |t|
>       v = DRbObject.new_with_uri(t).get_value
>       if v.nil?
>         puts s.to_s + " & error"
>       end
>       s += v
>     end
>     return s
>   end
> end
>
> class TestClient
>   include DRb::DRbUndumped
>
>   def initialize(addr, server, value)
>     DRbObject.new_with_uri(server).register(addr)
>     @value = value
>   end
>   def get_value
>     @value
>   end
> end
>
>
> uri = "druby://localhost:"
> server_uri = uri + "40000"
> server = DRb.start_service(server_uri, TestServer.new)
>
> max_size = 300
>
> (1..max_size).each do |t|
>   client_uri = uri + (40000 + t).to_s
>   DRb.start_service(client_uri, TestClient.new(client_uri, server_uri,
> t))
> end
>
> sum = DRbObject.new_with_uri(server_uri).sum
> puts sum
>
>
> For max_size = 10, sum = 55
> For max_size = 100, sum = 5050
>
> ...
>
> but
>
> For max_size = 300,
> DRb::DRbConnError exception raised.
>
> try to make another DRb server after that error in the same process....
> #<Errno::EMFILE: Too many open files - socket(2)> raised.
>
>
> How can I open more than 300 DRb connection?
> (I need to make about 1,000 connections .... )

question probably everyone want's to ask.why the hell you need 1000 
connections? dont' tell me you have 1000 servers with drbservers running 
somewhere

-- 
Marcin Raczkowski
---
Friends teach what you should know
Enemies Teach what you have to know