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最近readmine速度越来越慢。网上查了一下，把其自带的服务器webrick 换成为mongrel，可以解决这个问题，具体操作方法如下，方法：
gem install mongrel
如果提示类似“
http11.c: In function ‘header_done’: http11.c:172:13: error: ‘struct RString’ has no member named ‘ptr’ http11.c:172:13: error: ‘struct RString’ has no member named ‘ptr’ http11.c:172:13: error: ‘struct RString’ has no member named ‘ptr’ http11.c:174:89: error: ‘struct RString’ has no member named ‘ptr’ http11.c:176:52: error: ‘struct RString’ has no member named ‘ptr’ http11.c:177:26: error: ‘struct RString’ has no member named ‘len’ http11.c: In function ‘HttpParser_execute’: http11.c:298:23: error: ‘struct RString’ has no member named ‘ptr’ http11.c:299:23: error: ‘struct RString’ has no member named ‘len’ http11.c:307:5: warning: format not a string literal and no format arguments [-Wformat-security] make: *** [http11.o] Error 1
之类的错误的话，需要先执行一下
sudo gem install mongrel --pre安装mongrel替代webrick，遇到如下问题（ruby版本1.9.2 rails版本3.1.3）
ERROR: Error installing mongrel:
ERROR: Failed to build gem native extension.
原因在于Mongrel 1.1.5与Ruby 1.9.x 不兼容。可以通过安装另个版本
gem install mongrel --pre
或者
gem install mongrel -v 1.2.0.pre2 --pre --sourcehttp://ruby.taobao.org
成功安装
安装完后运行：[root@yyzctest redmine-2.1.2]# ruby script/rails server mongrel -e production -d -p9042/usr/local/lib/ruby/gems/1.9.1/gems/rack-1.4.1/lib/rack/handler/mongrel.rb:1:in `require‘: cannot load such file -- mongrel (LoadError)from /usr/local/lib/ruby/gems/1.9.1/gems/rack-1.4.1/lib/rack/handler/mongrel.rb:1:in `‘from /usr/local/lib/ruby/gems/1.9.1/gems/rack-1.4.1/lib/rack/handler.rb:20:in `const_get‘from /usr/local/lib/ruby/gems/1.9.1/gems/rack-1.4.1/lib/rack/handler.rb:20:in `block in get‘from /usr/local/lib/ruby/gems/1.9.1/gems/rack-1.4.1/lib/rack/handler.rb:20:in `each‘from /usr/local/lib/ruby/gems/1.9.1/gems/rack-1.4.1/lib/rack/handler.rb:20:in `inject‘from /usr/local/lib/ruby/gems/1.9.1/gems/rack-1.4.1/lib/rack/handler.rb:20:in `get‘from /usr/local/lib/ruby/gems/1.9.1/gems/rack-1.4.1/lib/rack/server.rb:269:in `server‘from /usr/local/lib/ruby/gems/1.9.1/gems/railties-3.2.8/lib/rails/commands/server.rb:59:in `start‘from /usr/local/lib/ruby/gems/1.9.1/gems/railties-3.2.8/lib/rails/commands.rb:55:in `block in ‘from /usr/local/lib/ruby/gems/1.9.1/gems/railties-3.2.8/lib/rails/commands.rb:50:in `tap‘from /usr/local/lib/ruby/gems/1.9.1/gems/railties-3.2.8/lib/rails/commands.rb:50:in `‘from script/rails:6:in `require‘from script/rails:6:in `‘[root@yyzctest redmine-2.1.2]# /mongrel.rb:1:in `require‘: cannot load such file -- mongrel (LoadError)还是一样报错.需要做如下操作：redmine 文件夹下找到gemfile 文件，打开加入下面一句
gem ‘mongrel‘,‘~> 1.2.0.pre2‘
2、运行[root@yyzctest redmine-2.1.2]# ruby script/rails server mongrel -e production -d -p9042 => Booting Mongrel => Rails 3.2.8 application starting in production on http://0.0.0.0:9042 /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in `block in require‘: iconv will be deprecated in the future, use String#encode instead. [root@yyzctest redmine-2.1.2]#速度比以前快多了
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原文地址：http://www.cnblogs.com/grimm/p/5603951.html
