memcached

PHP Can't find save handler memcache

由 爷，独闯天下 提交于 2019-12-14 01:25:02
问题 I'm busting my brains over this issue (it should be straightforward), but can't seem to find a solution so hopefully one of you can help me. I'm trying to store sessions using php's memcache extension. I'm running MAMP and have installed the extension correctly (I think...it shows up when I do phpinfo), am running the daemon and can connect to it through php, using something like this: $memcache = new Memcache; $memcache->connect('localhost', 11211) or die ("Could not connect"); So I KNOW

缓存协议:redis和memcached的优缺点及区别

由 拟墨画扇 提交于 2019-12-13 21:24:20
memcached 和 redis 都很类似：都是内存型数据库，数据保存在内存中，通过tcp直接存取，优势是速度快，并发高，缺点是数据类型有限，查询功能不强，一般用作缓存。 那么题主说 memcached 的事情 redis 都可以做，那么为什么 memcached 还有人用？那是因为它们两者并不是完全可以相互替代的，它们也有各自的长短优缺点 Memcached Memcached的优点： Memcached可以利用多核优势，单实例吞吐量极高，可以达到几十万QPS（取决于key、value的字节大小以及服务器硬件性能，日常环境中QPS高峰大约在4-6w左右）。 适用于最大程度扛量，有效为服务器减压。 支持直接配置为session handle。 配置维护的坑比较少。 Memcached的局限性： 数据结构很简单单一，只支持简单的key/value数据结构，不像Redis可以支持丰富的数据类型。 无法进行持久化，数据不能备份，只能用于缓存使用，且重启后数据全部丢失。 无法进行数据同步，不能将MC中的数据迁移到其他MC实例中。 Memcached内存分配采用Slab Allocation机制管理内存，value大小分布差异较大时会造成内存利用率降低，并引发低利用率时依然出现踢出等问题。需要用户注重value设计。 memcached服务端原生不支持水平扩展

CakePHP + NGINX + Memcache

由 微笑、不失礼 提交于 2019-12-13 20:30:37
问题 I am trying to use Memcache on NGINX for CakePHP (2.4.7) but when I update the core.php & bootstrap.php to do this I am then thrown the following exception: Fatal error: Uncaught exception 'CacheException' with message 'Cache engine _cake_core_ is not properly configured I have tried to search if any other configuration is required but can't see anything. Any help would be appreciated Thanks, 回答1: First of all you need be sure that your Memcached configured and working properly. Check

EventListener for Object removed from memcached

由 风流意气都作罢 提交于 2019-12-13 17:13:58
问题 i am using memcached server to store some object with different expire times, is there some way to add event listener on removal or expiration of that object? Currently i'm using spymemcached client. How can i achieve that i do some cleanup just before my object is deleted/expires. Thanks 回答1: There is no way to register an event listener on memcached server. Also, expired objects are lazily removed from memcached. This means that an expired item will only be removed if you try to get an item

How to specify memcache server to Rack::Session::Memcache?

由 主宰稳场 提交于 2019-12-13 16:32:22
问题 I'm trying to configure my Rack app to use Memcache for sessions with Rack::Session::Memcache How do I give it the options (such as server, username and password)? Presently I have use Rack::Session::Memcache But I get the error in `initialize': No memcache servers (RuntimeError) Heroku has put the config in environment variables MEMCACHE_PASSWORD: MEMCACHE_SERVERS: MEMCACHE_USERNAME: I know I can get these in Ruby with ENV['MEMCACHE_PASSWORD'] but I don't know how to give them to Rack:

大型网站技术架构：核心原理与案例分析-李智慧

由 两盒软妹~` 提交于 2019-12-13 15:09:31
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 大型网站架构演化 大型网站软件系统的特点 高并发，大流量 高可用 海量数据 用户分布广泛，网络情况复杂 安全环境恶劣 需求快速变更，发布频繁 渐进式发展 大型网站架构模式 网站架构模式 分层(横向) 在大型网站架构中采用分层结构，将网站软件系统分为应用层、服务层、数据层 分割(纵向) 网站常用的分布式方案 分布式应用和服务 分布式静态资源 分布式数据和存储 分布式计算 异步 冗余 服务器冗余运行，数据冗余备份。大型网站对整个数据中心进行备份，在全球范围内部署灾备数据中心。 自动化 安全 大型网站核心架构要素 性能 可用性 伸缩性 扩展性 安全性 瞬时响应：网站的高性能架构 网站性能测试 性能测试标准 性能测试方法 性能测试 负载测试 压力测试 稳定性测试 性能测试报告 性能优化策略 性能分析 检查请求处理的各个环节的日志，分析哪个环节响应时间不合理、超过预期；然后检查监控数据，分析影响性能的主要因素是内存、磁盘、网络还是CPU，是代码问题还是架构设计不合理，或者系统资源确实不足 性能优化 web前端性能优化 减少http请求 使用浏览器缓存 启用压缩 对于html、css、javascript文件启用GZip压缩，但压缩会对服务器和浏览器产生一定的压力，在通信带宽良好，而服务器资源不足的情况下要权衡考虑

spymemcached - is it possible to disable the logging system?

由 删除回忆录丶 提交于 2019-12-13 13:35:38
问题 we are using the spymemcached memcached client but we didn't discovered how we could disable the logging system. How could we at runtime change the current logging system to something like log4j or sl4j? Notice: We could pass some VM arguments, but the problem is: we can't change our server configuration. Is it possible to pass these VM arguments at runtime? If possible, how could we do that? 回答1: I stopped excessive Tomcat logging to catalina.out by doing this before creating the

Memcache error: Failed reading line from stream (0) Array

由 自闭症网瘾萝莉.ら 提交于 2019-12-13 12:29:50
问题 I get some variation of the following error when our server gets put under any significant load. I've Googled for hours about it and tried everything (including upgrading to the latest versions and clean installs). I've read all the posts about it here on SA, but can't figure it out. A lot of people are having the same problem, but no one seems to have a definitive answer. Any help would be greatly appreciated. Thanks in advance. Fatal error: Uncaught exception 'Zend_Session_Exception' with

Caching strategies in MVC Framework?

由 僤鯓⒐⒋嵵緔 提交于 2019-12-13 11:51:25
问题 I wrote my own little PHP MVC Framework, and now Im exploring caching strategies in PHP MVC Frameworks. Im thinking about what can be cached, where and how. The framework I have is simple MVC Framework. I have front controller, that boots up application, registers class auto loading, sets up php run time directives... and at the end analyses URL and dispatches request to appropriate controller, method, action controller, how ever you want to call it. From controller, I have access to Domain

Class 'Memcached' not found-(php 5.4.9,windows 7)

由 若如初见. 提交于 2019-12-13 11:51:12
问题 I installed php-5.4.9(32 bit) on my windows 7 (64 bit machine) and configured it to run as a php-fpm process. I need memcached for my web application and hence installed memcached daemon and the necessary dll file in my php\ext folder. But when I try to run my web application folder I always get Class Memcached not found error. I tried googling and also referred to some stackoverflow but couldn't find the solution to my problem. Can somebody please help me understand what I am doing wrong?
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