基于libmemcached,php扩展memcached的安装

一,为什么要装memcached扩展

memcached的1.2.4及以上增加了CAS(Check and Set)协议,对于同一key的多进行程的并发处理问题。这种情况其实根数据库很像,如果同时有几个进程对同一个表的同一数据进行更新的话,那会不会打架 呢,哈哈。数据库里面可以锁定整张表,也可以锁定表里面一 行的功能,其实memcached加入的CAS根这个差不多。

php的扩展memcache,不支持cas,所以我们要装memcached扩 展,memcached扩展是基于libmemcached,所以要先安装libmemcached

 

二,查看memcahced的版本信息

telnet 127.0.0.1 12000
stats
你会看到有以下信息
STAT pid 15322
STAT uptime 1885
STAT time 1279455772
STAT version 1.2.8
STAT pointer_size 32
如果版本过低,考虑重新装一下

退出telnet ,ctrl + ] 然后在按q就行了。

三,安装所要软件

wget http://launchpad.net/libmemcached/1.0/0.42/+download/libmemcached-0.42.tar.gz

wget http://pecl.php.net/get/memcached-1.0.2.tgz

memcached的官方网站 http://www.memcached.org/

四,安装libmemcached

tar zxvf libmemcached-0.42.tar.gz
cd libmemcached-0.42
./configure –prefix=/usr/local/libmemcached  –with-memcached
make && make install

安装要注意的问题:

1,  安装过程中不要忘了,–with-memcached,不然会提示你

checking for memcached… no
configure: error: “could not find memcached binary”

2,你的memcached是不是1.2.4以上的,如果不是会提示你

clients/ms_thread.o: In function `ms_setup_thread’:
/home/zhangy/libmemcached-0.42/clients/ms_thread.c:225: undefined reference to `__sync_fetch_and_add_4′
clients/ms_thread.o:/home/zhangy/libmemcached-0.42/clients/ms_thread.c:196: more undefined references to `__sync_fetch_and_add_4′ follow
collect2: ld returned 1 exit status
make[2]: *** [clients/memslap] Error 1
make[2]: Leaving directory `/home/zhangy/libmemcached-0.42′

解决办法是–disable-64bit CFLAGS=”-O3 -march=i686″,如果不用这个64位的long型数据,我想php扩展memcached,memcache也就没什么区别了,装 memcached也就没什么意思了。

五,php的扩展memcached的安装

tar zxvf memcached-1.0.2.tar.gz
cd memcached-1.0.2
/usr/local/php/bin/phpize
./configure –enable-memcached –with-php-config=/usr/local/php/bin/php-config –with-libmemcached-dir=/usr/local/libmemcached
./configure –prefix=/usr/local/phpmemcached  –with-memcached
make && make install

vi /usr/local/php/lib/php.ini

加上extension=memcached.so重起一下服务就可以了.

 

转载:http://blog.51yip.com/php/928.html

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