From: Bill Kelly <billk@...>
Date: 2007-11-15T12:59:29+09:00
Subject: Re: ruby incredibly slow (update 2)


From: "Ron Jeffries" <ronjeffries@acm.org>
>
> On Wed, 14 Nov 2007 22:27:46 -0500, Ron Jeffries <ronjeffries@acm.org>
> wrote:
> 
>>On Wed, 14 Nov 2007 14:03:36 -0500, Eric Hodel <drbrain@segment7.net>
>>wrote:
>>>
>>>$ time ruby -rsocket -e 'p Socket.gethostbyname("127.0.0.1")'
>>>["localhost", ["test"], 2, "\177\000\000\001"]
>>>
>>>real    0m0.042s
>>>user    0m0.010s
>>>sys     0m0.009s
>>
>>It's a solid 8 seconds on my machine. But ordinary web page access is
>>nothing like that. What is this telling us?
> 
> I flushed dns cache (windows xp), same result. changed from system
> default DNS to some specific known DNS servers. Same result.

Weird.  Not sure this would make any difference, but, might
try adding this at the beginning of your program:

require 'resolv-replace'

It patches a pure-ruby DNS resolver implementation in place of
IPSocket#getaddress, etc., instead of using the blocking system
call.

Also, is `nslookup.exe` fast when invoked from a command prompt?


Regards,

Bill