PHP和JSP作为服务器脚本语言的性能比较-毕业论文外文翻译.doc

Performance Comparison of PHP and JSP as Server-Side Scripting LanguagesMaterialSource: Notesin Computer Science  Author: Scott Trent; Michiaki Tatsubori; Toyotaro Suzumura; Akihiko Tozawa and Tamiya Onodera1 IntroductionThe dynamic scripting language PHP(PHP Hypertext Preprocessor) has become enormously popular for implementing lightweight web applications,and is widely used to access databases and other middleware.Apache module popularity surveys performed by Security Space in October 2007 indicate that 37% of Apache servers have PHP support enabled ,making it the most popular Apache module by 10 percentage points.Businesses are quickly realizing the powerful combination of a service oriented architecture environment with dynamic scripting languages like PHP .However,we believe that there are still critical performance issues involving PHP which remain to be investigated.This paper focuses on the use of dynamic scripting languages to implement web server front-end interfaces. This corresponds with the way that the industry standard web server performance benchmark SPECweb2005 utilizes PHP and JSP ( JavaServer Pages).In this case, scripts are used for the implementation of dynamic page generation, rather than the realization of complex business logic. This contrasts with the traditional uses of complex JSP-based business logic implementation.While there are numerous studies on dynamic web content, this paper complements these studies with detailed analysis focusing on PHP. For example, following the performance study on CGI (Common Gateway Interface) based web servers for dynamic content by Yeager & McGrath back in 1995, researchers and practitioners have been examining the performance of more recent dynamic Webcontent generation technologies. These works, however, handle application scenarios where servlet front-ends implement relatively complex business logic. Although Warner and Worley discuss the importance of also using PHP with SPECweb2005, to the best of the author’s knowledge, this paper is the first to publish a detailed analysis of SPECweb2005 experimental results using both PHP and JSP. The detailed analysis of PHP and JSP performance based on SPECweb2005 offered by this paper enables designers and implementers of web servers to understand the relative performance and through put of different versions and configurations of PHP and JSP.2 Multi-tier Web Server Architecture: Lightweight Front-End Using PHP/JSP Developers typically use PHP to implement a front-end interface to dynamic Web content generators, which are combined with web server software and back-end servers to provide dynamic content. The web server directly handles requests for static content and forwards requests for dynamic content to the dynamic content generator. The dynamic content generator, supported by back-end servers, executes code which realizes the business logic of a web site and stores dynamic state. Back-end servers may be implemented as a straight-forward database, or may be more complex servers handling the business logic of the web site. The front-end implementation may vary from heavy-weight business logic handlers to lightweight clients composing content received from back-end servers. This paper focuses on multi-tier web site development scenarios utilizing such lightweight front-ends, supported by one or more layers of heavy-weight back-ends. This assumption is reasonable when considering Service-Oriented environments where PHP scripts are used to implement a "mash-up" of services provided elsewhere, in addition to the case of simple web sites such as bulletin boards where PHP scripts are just a wrapper to a database. Within the scenarios described in this paper, the dynamic content generator provides client implementation in addition to page composition. It connects to the back-end server through a network using either standard protocols such as HTTP or application/middleware-specific protocols.JSP technology can be considered an alternative to PHP in implementing such front-ends. While it is part of the Java Servlet framework, developers typically use JSP to implement lightweight front-ends. Both PHP and JSP allow developers to write HTML embedded code. In fact, although there are language inherent differences between PHP and Java, the use of PHP scripts and JSP files can be very similar. The objective of the experiments detailed in this paper is to measure the performance of lightweight front-end dynamic content generation written in PHP and JSP with popular web servers such as Apache and Lighttpd. This web server architecture scenario involves users who access a web server with pages written in plain static HTML, as well as JSP and PHP scripts which mix scripting language with HTML code. The configuration assumed within the paper is a typical one, where web server software, such as Apache, distinguishes between pure HTML, JSP, and PHP respectively with suffixes such as .htm。