<![CDATA[张宴的博客]]> http://zyan.cc/index.php zh-cn http://zyan.cc/post/290/ <![CDATA[初步试用Squid的替代产品──Varnish Cache网站加速器[原创]]]> 张宴 <net@s135.com> Wed, 29 Aug 2007 10:45:01 +0000 http://zyan.cc/post/290/
　　Varnish的作者Poul-Henning Kamp是FreeBSD的内核开发者之一，他认为现在的计算机比起1975年已经复杂许多。在1975年时，储存媒介只有两种：内存与硬盘。但现在计算机系统的内存除了主存外，还包括了cpu内的L1、L2，甚至有L3快取。硬盘上也有自己的快取装置，因此squid cache自行处理物件替换的架构不可能得知这些情况而做到最佳化，但操作系统可以得知这些情况，所以这部份的工作应该交给操作系统处理，这就是Varnish cache设计架构。

　　Varnish可以在FreeBSD 6.0和Linux 2.6内核上运行。

　　1、编译安装varnish HTTP加速器：
引用
wget http://blog.zyan.cc/soft/linux/varnish/varnish-1.1.1.tar.gz
tar zxvf varnish-1.1.1.tar.gz
cd varnish-1.1.1
./configure --prefix=/usr/local/varnish
make && make install

　　2、简单启动varnish守护进程，用本机80端口去反向代理加速127.0.0.1:81上的Apache服务器：
引用
/usr/local/varnish/sbin/varnishd -a :8080 -b 127.0.0.1:81 -p thread_pool_max=1500 -p thread_pools=5 -p listen_depth=512 -p client_http11=on -w 1,10000,120

　　Varnish官方网站：http://www.varnish-cache.org/

　　另有一份PDF文档，说明Varnish原理的：http://ishare.iask.sina.com.cn/cgi-bin/fileid.cgi?fileid=2163384

　　我测试了一下，在同等配置环境下，Varnish的性能确实要超过Squid，稳定性也不错，值得继续去深入研究。
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