From: Greg Hazel <redmine@...>
Date: 2010-02-08T15:36:00+09:00
Subject: [ruby-core:28100] [Bug #2721] OpenSSL::Random.random_bytes(1) is very slow the first time on Windows

Bug #2721: OpenSSL::Random.random_bytes(1) is very slow the first time on Windows
http://redmine.ruby-lang.org/issues/show/2721

Author: Greg Hazel
Status: Open, Priority: Normal
ruby -v: ruby 1.8.6 (2009-08-04 patchlevel 383) [i386-mingw32]

This seems to be true across 1.8.6, 1.8.7 and even 1.9.1 compiled with either MSVC6 or mingw.

The first call to OpenSSL::Random.random_bytes for any number of bytes is very slow, proportional to something like the amount of code loaded already.

On my machine, the first call in a fresh irb session takes about 2 seconds.
Running something like this:

10000.times do |i|
  eval("class SomeClass#{i}; end;")
end

increases the time for the first call to random_bytes to 5 seconds.

With a fresh Rails script/console, the first call takes about 30 seconds. Inside the first Rails request, it takes 80 seconds.

Calling the function as soon as possible allows me to spend only 2 seconds and not 80 later, but this seems like a very fixable thing.


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