OpenSSL导致Windows上的Rails引导时间非常慢 [英] OpenSSL causing very slow Rails boot time on Windows

问题描述

我在Ruby on Rails的运行速度非常慢时遇到问题.我在Windows 8计算机上使用Ruby 2.1.3p242和Rails 4.2.1.

I'm having a problem with Ruby on Rails running extremely slowly. I'm using Ruby 2.1.3p242 and Rails 4.2.1 on a Windows 8 machine.

每当我运行任何需要Rails引导的东西(包括测试)时，它都将花费很长时间来启动和运行.我在干净安装的rails上对config/environment.rb中的Benchmark进行了一些调用:

Whenever I run anything that requires rails to boot (including tests) it takes a long time to get up and running. I put some calls to Benchmark in config/environment.rb on a clean install of rails:

require File.expand_path('../application', __FILE__)
User cpu    System Cpu   Total Cpu   elapsed time
0.000000    0.000000     0.000000    (0.000000)

Rails.application.initialize!
15.282000   2.891000  18.173000 ( 18.201173)

很明显，Rails.application.initialize花费很长的时间才能考虑干净安装.

Clearly Rails.application.initialize is taking an absurdly long time considering its a clean install.

预先感谢您的帮助

Edit-1:我在具有4GB RAM的双核i3 4010u@1.7GHZ上运行.我认为我的机器并不会太糟糕，因为它可以很好地运行大多数事情.

Edit-1: I'm running on a dual core i3 4010u@1.7GHZ with 4gb of RAM. I don't think my machine is too bad as it runs most things very well.

我在Rails.application.initialize上运行ruby-prof并找到了罪魁祸首.一个进程占用了85％的运行时间:

Edit-2: I ran ruby-prof on Rails.application.initialize and found the culprit. A process was taking up 85% of the run time:

<Module::SecureRandom>#random_bytes
<Module::OpenSSL::Random>#random_bytes

这显然是在Ruby21/lib/ruby/2.1.0/securerandom.rb#62中发生的 我在该文件中查找了第62行，这就是我发现的内容:

This is apparently occuring in Ruby21/lib/ruby/2.1.0/securerandom.rb#62 I looked up line 62 in that file and this is what I found:

return OpenSSL::Random.random_bytes(n)

所以有人知道这意味着什么吗?

So anyone have any idea what this means?

推荐答案

Edit-2:我在Rails.application.initialize上运行ruby-prof，发现 罪魁祸首.一个进程占用了85％的运行时间:

Edit-2: I ran ruby-prof on Rails.application.initialize and found the culprit. A process was taking up 85% of the run time:

<Module::SecureRandom>#random_bytes
<Module::OpenSSL::Random>#random_bytes

是的，在Windows上，用于为随机数生成器提供种子的OpenSSL代码是有问题的.请参阅OpenSSL Wiki上的随机数和Windows问题.

Yeah, the OpenSSL code for seeding the random number generator is problematic on Windows. See Random Numbers and Windows Issues on the OpenSSL wiki.

return OpenSSL::Random.random_bytes(n)

所以有人知道这意味着什么吗?

So anyone have any idea what this means?

Ruby返回随机数.在这种情况下，由于未提供其他种子，因此OpenSSL将在使用RAND_poll重新调整随机数之前自动对自身进行种子处理.

Ruby is returning random numbers. In this case, OpenSSL will autoseed itself before retuning random number with RAND_poll since no other seed was provided.

Ruby应该不调用RAND_poll或允许它被库隐式调用.如果尚未为随机数生成器添加种子，则库将通过内部调用RAND_poll自动为其自身添加种子.

Ruby should not call RAND_poll or allow it to be implicitly called by the library. If the random number generator has not been seeded, then the library will automatically seed itself by calling RAND_poll internally.

相反，Ruby应该使用 CryptGenRandom ，然后调用OpenSSL的RAND_seed.这样可以避免调用RAND_poll.

Rather, Ruby should read bytes from the OS using CryptGenRandom, and then call OpenSSL's RAND_seed. That will avoid the call to RAND_poll.

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