From: Brian Candler <B.Candler@...>
Date: 2007-05-04T16:46:06+09:00
Subject: Re: Net::HTTP performance difference: FreeBSD vs. Ubuntu ?

On Fri, May 04, 2007 at 02:26:13PM +0900, J. Wook wrote:
>   ... iterate for success_url, invalid_url, error_url
> 
> end
> 
> puts "Total: #{downloaded/1000} KB,  #{Time.now - start_time} seconds"
> 
> 
> 
> Result was... very strange.
> 
>                                   time
> MacBook                 about 20 sec
> FreeBSD6.1             about 11 sec
> Ubuntu                   about 73 sec (What's wrong with it?????)
> 
> (ruby1.8.6, same h/w spec of FreeBSD and Ubuntu)
> 
> 
> I couldn't find any configuration difference (dependent library, ruby
> version... etc)
> 
> Why this strange performance drop occurs on Ubuntu?

To debug this, first run your loop separately for redirect_url only,
success_url only, invalid_url only, and error_url only. Maybe only one of
these is suffering large delays. That will help narrow the problem.

My guess is it's something to do with DNS resolution. Check your
/etc/resolv.conf is identical between all three machines.