淺析Ruby on Rails部署方案(二)

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後端的問題
在前面的測試報告中，我們似乎看不出什麼問題，好像即使處理速度不夠，多開幾個進程就可以了。這是因爲測試是在比較理想的環境下進行的，而實際的生產環境情況要複雜得多。雖然Mongrel在此次測試的結果中顯示了很好的穩定性，但是這並不能表示Mongrel就可以在生產環境中同樣保持很好的穩定性。
原因在於Ruby的線程機制。但首先這裏要強調的是，雖然Ruby的虛擬機有缺陷，線程是僞線程，線程性能較差，但這並不妨礙Ruby可以做一些同步或異步的工作（可以參考Erlang）。問題的關鍵在於Rails本身不是線程安全的，如果查看Mongrel的代碼則會發現，Mongrel在調用 Rails的分發器之前就加了鎖，直到Rails處理完這個請求。請參考/var/lib/gems/1.8/gems/mongrel-1.1.4 /lib/mongrel/rails.rb第74行（不同的系統上的目錄有所不同，不同版本的mongrel，代碼出現的位置也可能不同）如下：

<span style="background-color: rgb(255,255,0)">@guard.synchronize {</span><br > @active_request_path = request.params[Mongrel::Const::PATH_INFO] <br > Dispatcher.dispatch(cgi, <br >
ActionController::CgiRequest::DEFAULT_SESSION_OPTIONS, [...]