Net::HTTP performance difference: FreeBSD vs. Ubuntu?

ruby-talk
1

Strange ruby network performance drop examined on Ubuntu.

I made a simple HTTP testing code like below.

redirect_url = "http://www.talk-with-hani.com/feed"
success_url = "http://www.daum.net"
invalid_url = "http://www.daauumm.net"
error_url = "http://errorurl1234.tistory.com"

start_time = Time.now
downloaded = 0

5.times do

  begin
    uri = URI.parse(redirect_url)
    r = Net::HTTP.get_response(uri)
    c += r.body.size
  rescue Exception => e
    puts e.class
  end

  ... 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?

Please help me to fix Ubuntu performance problem.

···

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Posted via http://www.ruby-forum.com/.

2

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.

···

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?