blocks|key|153125|text|所以这是我在升级后必须做的事情。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|153126|>=+1.2.x不兼容，出现升级到Bundler+1.3的错误，Bundler+1.3尚未发布。因此，如果你使用的是RVM，就跳转到2.0+ruby的全局gemset，并升级到1.3.pre版本，直到1.3.0发布。而且，rubygems+api似乎也有一些问题。我的包安装没有使用新的API，而是使用旧的“fetch+index”方法，这当然需要更长一点的时间。|153127|除此之外，我的包确实安装得很干净，并且我的全套规范测试都完成了，一切正常。我做了一些计时测试，看看rails的加载时间有多快。|153128|#+Using+1.9.3-p327

RSpec+Time:+24.87s
Wall+Time+:+34.40s
Load+Time+:++9.53s

#+Using+2.0.0-p0

RSpec+Time:+22.49s+(90.4%25)
Wall+Time+:+26.89s+(78.2%25)
Load+Time+:+++4.4s+(46.2%25)|code-block|syntax|javascript|153129|显然，对于所有的测试gem，rspec的加载时间稍微重了一点，但是加载时间减少了50%25以上，测试运行时间减少了10%25，这是很好的。|153130|我使用rails+runner+'puts+User.count'做了一个类似的测试，它将跳过测试引导。|offset|length|style|CODE|153131|1.9.3+:+7.27s
2.0.0+:+3.36s+(46.2%25)|153132|再一次，漂亮的降幅超过50%25+:)|153133|有点脱轨了……我猜新的玩具会做到这一点，但似乎我唯一要做的改变就是升级到预发布的捆绑包。|153134|下面是不同迭代器的另一个测试|153135|$+rvm+1.9.3-p327,2.0.0-p0+--verbose+do+ruby+test.rb
ruby-1.9.3-p327:+ruby+1.9.3p327+(2012-11-10+revision+37606)+[i686-linux]+
+++++++user+++++system++++++total++++++++real
for++++0.610000+++0.000000+++0.610000+(++0.607189)
times++0.580000+++0.000000+++0.580000+(++0.587303)
upto+++0.590000+++0.000000+++0.590000+(++0.585730)
each+++0.590000+++0.000000+++0.590000+(++0.593494)
ruby-2.0.0-p0:+ruby+2.0.0p0+(2013-02-24+revision+39474)+[i686-linux]+
+++++++user+++++system++++++total++++++++real
for++++0.590000+++0.000000+++0.590000+(++0.582743)
times++0.560000+++0.000000+++0.560000+(++0.565961)
upto+++0.560000+++0.000000+++0.560000+(++0.562400)
each+++0.570000+++0.000000+++0.570000+(++0.573469)|153136|边际，大约4-5%25的收益。|153137|更有趣的是，调用Object.new+5亿次|153138|1.9.3+:+129.063s
2.0.0+:++97.234s|153139|对象创建时间减少了大约25%25。|153140|entityMap^0|0|0|0|0|0|3|U|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1C|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1D|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|1E|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|1F|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|1G|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|1H|8|@$O|1I|P|1J|Q|R]]|9|@]|A|$]]|$1|S|3|T|5|H|7|1K|8|@]|9|@]|A|$I|J]]|$1|U|3|V|5|6|7|1L|8|@]|9|@]|A|$]]|$1|W|3|X|5|6|7|1M|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|6|7|1N|8|@]|9|@]|A|$]]|$1|10|3|11|5|H|7|1O|8|@]|9|@]|A|$I|J]]|$1|12|3|13|5|6|7|1P|8|@]|9|@]|A|$]]|$1|14|3|15|5|6|7|1Q|8|@]|9|@]|A|$]]|$1|16|3|17|5|H|7|1R|8|@]|9|@]|A|$I|J]]|$1|18|3|19|5|6|7|1S|8|@]|9|@]|A|$]]|$1|1A|3|-4|5|6|7|1T|8|@]|9|@]|A|$]]]|1B|$]]

So here's what I had to do after upgrading.

Bundler 1.2.x is not compatible, it raises an error saying to upgrade to >= 1.3, which is not yet release. So if you are using RVM, jump into your global gemset for the 2.0 ruby and upgrade to 1.3.pre version until 1.3.0 is released. Also it seems like there's something up with the rubygems api. My bundle install did not use the new API, instead doing the old 'fetch index' method, which of course takes a little bit longer.

Aside from that, my bundle did install cleanly, and my full set of spec tests completed with all OK. I did some timing tests to see how much the rails load time has improved.

<pre><code># Using 1.9.3-p327

RSpec Time: 24.87s
Wall Time : 34.40s
Load Time : 9.53s

# Using 2.0.0-p0

RSpec Time: 22.49s (90.4%)
Wall Time : 26.89s (78.2%)
Load Time : 4.4s (46.2%)
</code></pre>

Obviously the load time for rspec is a little heavier with all of the testing gems, but still over a 50% drop in load time and a 10% drop in test run time is nice.

I did a similar test using <code>rails runner 'puts User.count'</code> which would skip the test bootstrapping.

<pre><code>1.9.3 : 7.27s
2.0.0 : 3.36s (46.2%)
</code></pre>

Again, nice drop of over 50% :)

Kind of getting off track here... new toys do that I guess, but it seems like the only change I had to make was upgrading to a pre-release bundler.

Here's another test of different iterators

<pre><code>$ rvm 1.9.3-p327,2.0.0-p0 --verbose do ruby test.rb
ruby-1.9.3-p327: ruby 1.9.3p327 (2012-11-10 revision 37606) [i686-linux] 
 user system total real
for 0.610000 0.000000 0.610000 ( 0.607189)
times 0.580000 0.000000 0.580000 ( 0.587303)
upto 0.590000 0.000000 0.590000 ( 0.585730)
each 0.590000 0.000000 0.590000 ( 0.593494)
ruby-2.0.0-p0: ruby 2.0.0p0 (2013-02-24 revision 39474) [i686-linux] 
 user system total real
for 0.590000 0.000000 0.590000 ( 0.582743)
times 0.560000 0.000000 0.560000 ( 0.565961)
upto 0.560000 0.000000 0.560000 ( 0.562400)
each 0.570000 0.000000 0.570000 ( 0.573469)
</code></pre>

Marginal, about a 4-5% gain.

More interesting is this, calling Object.new 500 million times

<pre><code>1.9.3 : 129.063s
2.0.0 : 97.234s
</code></pre>

About a 25% drop in object creation time.

blocks|key|153142|text|我开始了一个使用Rails4和ruby2.0的新项目。我就是这么做的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|153143|首先，我将RVM设置为Ruby2.0。|153144|然后安装bundler+1.3：|153145|$+gem+install+bundler|code-block|syntax|javascript|153146|更新了这些gem和'bundle+install‘。|153147|gem+'rails',+++++:git+=>+'git://github.com/rails/rails.git'
gem+'journey',+++:git+=>+'git://github.com/rails/journey.git'
gem+'arel',++++++:git+=>+'git://github.com/rails/arel.git'

group+:assets+do
++gem+'sass-rails',+++:git+=>+'git://github.com/rails/sass-rails.git'
++gem+'coffee-rails',+:git+=>+'git://github.com/rails/coffee-rails.git'
end|153148|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|S|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|T|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|H|7|V|8|@]|9|@]|A|$I|J]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

I started a new project with rails 4 and ruby 2.0. This is how I did it.

First, I set RVM to Ruby 2.0.

Then installed bundler 1.3:

<pre><code>$ gem install bundler
</code></pre>

Updated these gems and 'bundle install'.

<pre><code>gem 'rails', :git =&gt; 'git://github.com/rails/rails.git'
gem 'journey', :git =&gt; 'git://github.com/rails/journey.git'
gem 'arel', :git =&gt; 'git://github.com/rails/arel.git'

group :assets do
 gem 'sass-rails', :git =&gt; 'git://github.com/rails/sass-rails.git'
 gem 'coffee-rails', :git =&gt; 'git://github.com/rails/coffee-rails.git'
end
</code></pre>

Ruby 2.0 has been released, see:

<a href="http://www.ruby-lang.org/en/news/2013/02/24/ruby-2-0-0-p0-is-released/" rel="noreferrer">http://www.ruby-lang.org/en/news/2013/02/24/ruby-2-0-0-p0-is-released/</a>

What changes to my Rails App/Installation should I anticipate making after upgrading my system to Ruby 2.0?

Configuring Rails for Ruby 2.0

Ruby 2.0已经发布，请参阅：在将我的系统升级到Ruby2.0之后，我应该对我的Rails应用程序/安装进行哪些更改？

问为Ruby 2.0配置Rails
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