memcached 以及 php新客户端memcached 装配(参考)
memcached 以及 php新客户端memcached 安装(参考)
2010-02-23 11:05web2.0和web1.0不一样，web1.0以内容为中心，所以web1.0做负载只需缓存内容就可以了，使用反向代理缓存页面就可以解决大部分问题了。而web2.0鼓励用户交互，内容都是动 态的，只做反向代理命的话中率低，而且对数据库进行频繁的写，对数据库压力大。所以，web2.0对 web1.0更需要使用内存缓存。 memcached高性能的，分布式的内存对象缓存系统，在动态应用中减少数据库负载，提升访问速度。memcached已经被广泛应用在各种软件中，例如，nginx、mysql 一、服务端安装 使用weget下载libevent和memcached libevent: http://monkey.org/~provos/libevent-1.4.9-stable.tar.gz memcached: http://www.danga.com/memcached/dist/memcached-1.2.6.tar.gz 1.先安装libevent tar zxvf libevent-1.4.9-stable.tar.gz cd libevent-1.4.9-stable ./configure make make install tar zxvf libevent-1.4.9-stable.tar.gz cd libevent-1.4.9-stable ./configure make make install 2.安装memcached tar zxvf memcached-1.2.6.tar.gz cd memcached-1.2.6 ./configure --enable-threads make make install tar zxvf memcached-1.2.6.tar.gz cd memcached-1.2.6 ./configure --enable-threads make make install 注：如果启动时出现“memcached: error while loading shared libraries: libevent-1.4.so.2: cannot open shared object file: No such file or directory”之类的信息，表示memcached找不到libevent的位置 所以，请先使用whereis libevent得到位置，然后连接到memcached所寻找的路径 [root@localhost tools]# whereis libevent libevent: /usr/local/lib/libevent.la /usr/local/lib/libevent.so /usr/local/lib/libevent.a [root@localhost tools]# LD_DEBUG=libs memcached -v 2>&1 > /dev/null | less [root@localhost tools]# ln -s /usr/local/lib/libevent-1.4.so.2 /lib64/ 二、php安装对memcached的支持 php有两个版本的memcached客户端 1.memcached 这个是新版的客户端基于libmemcached，所以必须要安装libmemcached 先安装libmemcached 下载地址：http://download.tangent.org/libmemcached-0.26.tar.gz [root@localhost tools]# tar zxvf libmemcached-0.26.tar.gz [root@localhost tools]# cd libmemcached-0.26 [root@localhost libmemcached-0.26]# ./configure --prefix=/usr/local/libmemcached/ --with-libmemcached-dir=/usr/local/libmemcached/ [root@localhost libmemcached-0.26]# make [root@localhost libmemcached-0.26]# make install [root@localhost tools]# tar zxvf libmemcached-0.26.tar.gz [root@localhost tools]# cd libmemcached-0.26 [root@localhost libmemcached-0.26]# ./configure --prefix=/usr/local/libmemcached/ --with-libmemcached-dir=/usr/local/libmemcached/ [root@localhost libmemcached-0.26]# make [root@localhost libmemcached-0.26]# make install 安装php memcached及最新客户端 下载地址：http://pecl.php.net/get/memcached [root@localhost tools]# tar zxvf memcached-0.1.4.tgz [root@localhost tools]# cd memcached-0.1.4 [root@localhost memcached-0.1.4]# ./configure --with-php-config=/usr/local/php/bin/php-config --with-libmemcached-dir=/usr/local/libmemcached/ [root@localhost memcached-0.1.4]# make [root@localhost memcached-0.1.4]# make install [root@localhost tools]# tar zxvf memcached-0.1.4.tgz [root@localhost tools]# cd memcached-0.1.4 [root@localhost memcached-0.1.4]# ./configure --with-php-config=/usr/local/php/bin/php-config --with-libmemcached-dir=/usr/local/libmemcached/ [root@localhost memcached-0.1.4]# make [root@localhost memcached-0.1.4]# make install 修改php.ini添加extension = "memcached.so"就可以了。 1. checking for libmemcached location... configure: error: memcached support requires libmemcached. Use --with-libmemcached-dir=<DIR> to specify the prefix where libmemcached headers and library are located checking for libmemcached location... configure: error: memcached support requires libmemcached. Use --with-libmemcached-dir=<DIR> to specify the prefix where libmemcached headers and library are located 请先用whereis libmemcached找到路径，然后添加选项--with-libmemcached-dir=libmemcached路径 2.memcache 下载地址：http://pecl.php.net/get/memcache [root@localhost tools]# tar zxvf memcache-3.0.3.tgz [root@localhost tools]# cd memcache-3.0.3 [root@localhost tools]# /usr/local/php/bin/phpize [root@localhost tools]# ./configure --with-php-config=/usr/local/php/bin/php-config [root@localhost tools]# make [root@localhost tools]# make install [root@localhost tools]# tar zxvf memcache-3.0.3.tgz [root@localhost tools]# cd memcache-3.0.3 [root@localhost tools]# /usr/local/php/bin/phpize [root@localhost tools]# ./configure --with-php-config=/usr/local/php/bin/php-config [root@localhost tools]# make [root@localhost tools]# make install 修改php.ini添加extension = "memcache.so"就可以了。 提示：如果php找不到so文件，请设置extension_dir。 ps：这篇东西在草稿箱里呆很久了，最后还是决定把一篇分多篇发吧，这样感觉快多了。 来源：http://willko.iteye.com/blog/332993NetSeek (2009-9-10 11:16:40)memcached 的客户端 libmemcached, 在处理value超过8k的数据时, 速度会直线下降, 在 http://lists.tangent.org/piperma ... ovember/000484.html, 可以找到答案, 原因是libmemcached的buf太小了, 找到源文 件memcached_constants.h, 修改#define MEMCACHED_MAX_BUFFER 8196, 改成合适的大小, 重新编译, 安装, 就可以了. libmemcached是C客户端库的接口到memcached服务器。它被设计为轻的内存使用情况，线程安全，并提供充分获得服务器端的方法。它还采用多种 命令行工具： memcat ， memflush ， memrm ， memstat ，并memslap （负载代）。图书馆一直在设计，让不同的散列方法对密钥，分割的钥匙 ，并使用统一的散列分配。 许可： BSD许可证（修订） 变化： 修正递减的散列关键。修正的断言，是抓不好memset （ ）调用的host_reset （ ） 。修正的一个问题，清除阻塞的I / O已经堆叠。增补memstat 。一种新的API冲水。 memcached简单的使用教程 这是工程应用性质的文章：memcached是数据快速存取的工具，wikipedia和facebook就用了它提高速度。具体情况可以wiki. c/c++里面使用memcached本来是很简单的事情，但就是没有人说，非要我去读libmemcache的实例代码才行，manpage也没有说清楚（但还不得不看 ）。如果要使用memcached，步骤如下： 1 安装memcached 你可以去官网上下载，也可以sudo apt-get install memcached 2 测试你刚才的安装， 比如运行 memcached -d -m 64 -l 127.0.0.1 -p 12300 -d表示后台, -m 64表示使用64MB内存，-l 127.0.0.1 -p 12300 表示监听127.0.0.1:12300端口 没有任何消息就是运行成功 3 安装libmemcached 这个就不要apt了，因为没有精确的libmemcached包，乖乖去官网下载吧。这个东西还需要libevent，这个没法apt，libevent安装的时候最好 装到/usr/lib里面，不然libmemcached还不能运行。 4 测试libmemcached 找一个文件比如test，然后运行memcp test --servers=127.0.0.1:12300 这样就把test拷贝到memcached管理的内存里面了。 memcat test --servers=127.0.0.1:12300 看看是不是刚才的那个文件。
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