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后端的问题
在前面的测试报告中，我们似乎看不出什么问题，好像即使处理速度不够，多开几个进程就可以了。这是因为测试是在比较理想的环境下进行的，而实际的生产环境情况要复杂得多。虽然Mongrel在此次测试的结果中显示了很好的稳定性，但是这并不能表示Mongrel就可以在生产环境中同样保持很好的稳定性。
原因在于Ruby的线程机制。但首先这里要强调的是，虽然Ruby的虚拟机有缺陷，线程是伪线程，线程性能较差，但这并不妨碍Ruby可以做一些同步或异步的工作（可以参考Erlang）。问题的关键在于Rails本身不是线程安全的，如果查看Mongrel的代码则会发现，Mongrel在调用 Rails的分发器之前就加了锁，直到Rails处理完这个请求。请参考/var/lib/gems/1.8/gems/mongrel-1.1.4 /lib/mongrel/rails.rb第74行（不同的系统上的目录有所不同，不同版本的mongrel，代码出现的位置也可能不同）如下：
@guard.synchronize {
@active_request_path = request.params[Mongrel::Const::PATH_INFO]
Dispatcher.dispatch(cgi,
ActionController::CgiRequest::DEFAULT_SESSION_OPTIONS, [...]