From: court3nay <court3nay@...>
Date: 2009-04-17T08:25:05+09:00
Subject: Weird performance issue

Hey, I'm debugging a weird performance issue. I have two VMs on the
same server running the same OS (arch linux) and the same version of
"enterprise" Ruby (ruby 1.8.6 (2008-08-08 patchlevel 286) [x86_64-
linux]).

On one machine, I get these numbers

irb(main):004:0> Benchmark.realtime { require 'rubygems' }
=> 0.0482780933380127
irb(main):005:0> Benchmark.realtime { require 'tinder' }
=> 0.395686149597168

On the other,

irb(main):002:0> Benchmark.realtime { require 'rubygems' }
=> 1.20596885681152
irb(main):003:0> Benchmark.realtime { require 'tinder' }
=> 5.7661280632019

Which is crazy.  Over an order of magnitude.  My question is, how can
I trace what is taking all the time?  It's not just requiring
libraries -- I can reproduce with pure math.  On the "fast" machine:

irb(main):007:0> Benchmark.realtime { 1000.times { 10 ** rand
(1000) } }
=> 0.00720095634460449

On the "slow" machine....

Benchmark.realtime { 1000.times { 10 ** rand(1000) } }
=> 0.142554998397827

Any ideas?