.net性能测试和优化3 负载均衡、IIS、HTTP优化

Load Balancing

在高负载的系统上，单服务器一般满足不了要求，此时多机分布负载均衡就需要解决Session状态的问题

以下是一些参考

SessionState的配置http://blog.csdn.net/nihongyuan/archive/2009/04/30/4139928.aspx

ASP.NET应用下基于SessionState的“状态编程框架”解决方案 http://www.cnblogs.com/artech/archive/2010/10/31/State_Management.html

IIS相关

IIS的版本，6,7版本有很大的变化

HTTP压缩

静态内容的设置：静态内容实用其他的专用web服务器更好

HTTP头设置：

Cache-Control, Expires ETag

Reverse proxy

开源的Squid作为反向代理

IIS7 www.iis.net/expand/ApplicationRequestRouting

CDN

Microsoft provides a CDN to serve the standard AJAX JavaScript libraries including www.asp.net/ajaxlibrary/cdn.ashx

HTTP 优化

Web客户端的优化和性能问题，如下工具是非常有用的

Firebug http://getfirebug.com/

Fiddler http://www.fiddlertool.com

YSlow http://developer.yahoo.com/yslow/

Internet Explorer Dev toolbar IE8内建

Tips:

• Make all of your static files as small as possible on the wire.

• Reduce your page sizes and compress whatever you can.

• Optimize your JavaScript and CSS and use HTTP efficiently.

• Analyze your site with YSlow.

• Use Firebug's Net Analysis to discover your page processing profile.

• Look at content expiration and compression.

• Profile your JavaScript-rich pages first.

• Compress your images as much as possible.

• Use CSS Sprites.

• Look for 404 errors.

• Remove white space and comments.