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memcachedlibevent: http://monkey.org/~provos/libevent-1.4.9-stable.tar.gzmemcached: http://www.danga.com/memcached/dist/memcached-1.2.6.tar.gz1.先安装libeventtar 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./configuremakemake install2.安装memcachedtar 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.gzcd memcached-1.2.6./configure --enable-threadsmakemake install注:如果启动时出现“memcached: error while loading shared libraries: libevent-1.4.so.2: cannot openshared 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[[email protected] tools]# whereis libevent libevent: /usr/local/lib/libevent.la /usr/local/lib/libevent.so /usr/local/lib/libevent.a [[email protected] tools]# LD_DEBUG=libs memcached -v 2>&1 > /dev/null | less [[email protected] 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[[email protected] tools]# tar zxvf libmemcached-0.26.tar.gz [[email protected] tools]# cd libmemcached-0.26 [[email protected] libmemcached-0.26]# ./configure --prefix=/usr/local/libmemcached/ --with-libmemcached-dir=/usr/local/libmemcached/ [[email protected] libmemcached-0.26]# make [[email protected] libmemcached-0.26]# make install [[email protected] tools]# tar zxvf libmemcached-0.26.tar.gz[[email protected] tools]# cd libmemcached-0.26[[email protected] libmemcached-0.26]# ./configure --prefix=/usr/local/libmemcached/ --with-libmemcached-dir=/usr/local/libmemcached/[[email protected] libmemcached-0.26]# make[[email protected] 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[[email protected] tools]# tar zxvf memcached-0.1.4.tgz [[email protected] tools]# cd memcached-0.1.4 [[email protected] memcached-0.1.4]# ./configure --with-php-config=/usr/local/php/bin/php-config --with-libmemcached-dir=/usr/local/libmemcached/ [[email protected] memcached-0.1.4]# make [[email protected] memcached-0.1.4]# make install [[email protected] tools]# tar zxvf memcached-0.1.4.tgz[[email protected] tools]# cd memcached-0.1.4[[email protected] memcached-0.1.4]# ./configure --with-php-config=/usr/local/php/bin/php-config --with-libmemcached-dir=/usr/local/libmemcached/[[email protected] memcached-0.1.4]# make[[email protected] 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[[email protected] tools]# tar zxvf memcache-3.0.3.tgz [[email protected] tools]# cd memcache-3.0.3 [[email protected] tools]# /usr/local/php/bin/phpize [[email protected] tools]# ./configure --with-php-config=/usr/local/php/bin/php-config [[email protected] tools]# make [[email protected] tools]# make install [[email protected] tools]# tar zxvf memcache-3.0.3.tgz [[email protected] tools]# cd memcache-3.0.3[[email protected] tools]# /usr/local/php/bin/phpize[[email protected] tools]# ./configure --with-php-config=/usr/local/php/bin/php-config[[email protected] tools]# make[[email protected] 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 memcached2 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。

TomakePHPapplicationsfaster,followthesesteps:1)UseOpcodeCachinglikeOPcachetostoreprecompiledscriptbytecode.2)MinimizeDatabaseQueriesbyusingquerycachingandefficientindexing.3)LeveragePHP7 Featuresforbettercodeefficiency.4)ImplementCachingStrategiessuc

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PHP performance bottlenecks can be solved through the following steps: 1) Use Xdebug or Blackfire for performance analysis to find out the problem; 2) Optimize database queries and use caches, such as APCu; 3) Use efficient functions such as array_filter to optimize array operations; 4) Configure OPcache for bytecode cache; 5) Optimize the front-end, such as reducing HTTP requests and optimizing pictures; 6) Continuously monitor and optimize performance. Through these methods, the performance of PHP applications can be significantly improved.

DependencyInjection(DI)inPHPisadesignpatternthatmanagesandreducesclassdependencies,enhancingcodemodularity,testability,andmaintainability.Itallowspassingdependencieslikedatabaseconnectionstoclassesasparameters,facilitatingeasiertestingandscalability.

CachingimprovesPHPperformancebystoringresultsofcomputationsorqueriesforquickretrieval,reducingserverloadandenhancingresponsetimes.Effectivestrategiesinclude:1)Opcodecaching,whichstorescompiledPHPscriptsinmemorytoskipcompilation;2)DatacachingusingMemc


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