Using resolve-replace to fix blocking Net::HTTP requests
posted: November 10th, 2007 · by: Sven
It took me a while to find relevant some info on this, so I thought I’d blog about it for others to find this more quickly with the keywords that I thought were a good starting point at first.
I’ve been running an outdated version of Mongrel (1.0.1 as of Jan 07) when I switched to Leopard. Everything continued to work fine except that I noticed (a while later) some the Ajax calls that call Net::HTTP to load some info from a webservice or external website would take very long or even would timeout.
I’m not really sure what’s going on there, but Apple seems to have changed a lot in how Mac OS X handles DNS lookups in Leopard … and these seem to block when they didn’t in Tiger.
After some googling I found that requiring the Ruby Standard Library piece ‘resolv-replace’ would fix this issue. Just put this line somewhere in your app where it get’s loaded at startup:
require 'resolv-replace'I noticed only later on that my Mongrel is outdated, too, and updated it. (There were three consecutive releases around the end of Okt 07.)
This also seems to fix the same issue. With different results, though. With Mongrel 1.1 things are back to a usable speed and requests aren’t blocked any more. But it’s still ~22 times faster to use resolv-replace, too:
Requests in my locale Mephisto setup without resolv-replace:
0.061855 milliseconds on averageWith resolve-replace:
0.002755 milliseconds on averageTo “benchmark” this I used:
start_time = Time.now
Net::HTTP.get_response(URI.parse('http://localhost/something.html'))
puts Time.now - start_timePS: Now that I started writing this blog post I googled for different keywords and it turns out that no other than Joshua Harvey blogged about the very same issue in Dec 2005. Funny, I could just have asked him about it. The world is small, sometimes. :)
ehsanul said February 15th, 2009 at 02:22 AM ¶
I know this is late as hell, but thanks! This is going to help me.
jack said January 23rd, 2011 at 11:12 AM ¶
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chat said March 31st, 2011 at 07:01 PM ¶
Here is a fix for the resolve-replace issue:
Dependencies.loadoncepaths -= Dependencies.loadoncepaths.select{|path| \ path =~ %r(^#{File.dirname(FILE)}) }
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