.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.iyunv.com/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.iyunv.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.
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