memcached

ibmemcached Linking Error: undefined reference to `memcached_exist'

由 倾然丶 夕夏残阳落幕 提交于 2020-01-17 07:59:29
问题 I am trying to write a sample code using libmemcached c/c++ client version (0.53) gcc -o test test.c -I/home/libmemcached/include -L/home/libmemcached/lib -lmemcached -lmemcachedutil However i get an error /tmp/ccoaToYP.o: In function main': test.c:(.text+0x255): undefined reference to memcached_exist' Has anyone come across this issue ? I cannot use version higher than 0.53 (basically any 1.0) due to limitation with installed gcc. I see that this command was added for 0.53. Also, The path

《【面试突击】— Redis篇》-- Redis的线程模型了解吗？为啥单线程效率还这么高？

由 老子叫甜甜 提交于 2020-01-17 02:23:15
1、面试题 Redis和Memcached有什么区别？ Redis的线程模型是什么？ 为什么Redis是单线程的但是还可以支撑高并发？ 2、面试官心理分析 问这个的时候就是问你Redis的原理了，看你是不是思考过，研究过。Redis最基本的一个内部原理和特点，就是Redis实际上是个单线程工作模型。你要是连这个都不知道，那后面在使用Redis的时候，如果出了问题岂不是什么都不知道，无从下手？ 还有可能面试官会问问你Redis和Memcached的区别。不过说实话，近几年，面试官都不太喜欢这么问了。因为memcached是早些年各大互联网公司常用的缓存方案，但是现在近几年基本都是Redis，没什么公司用memcached了。 3、温馨提醒 如果你要是现在还不知道redis和memcached是啥，那你赶紧百度一下redis入门和memcahced入门，找两篇博客教程什么的简单启动一下，然后试一下几个简单操作，先感受一下，跟这个博客跟着教程做个demo程序，1小时以内就搞定了，就能初步了解和入门了。然后接着回来继续看。 另外一个友情提示，要弄明白redis的线程模型的话，前提是你需要了解socket网络相关的基本知识。如果你socket都不了解的话那我觉得你java没学好吧。初学者都该学习java的socket网络通信相关知识的。 4、面试题剖析 （1

memcached的安装、常用命令以及在实际开发中的案例

由 会有一股神秘感。 提交于 2020-01-16 17:53:52
Memcached注意 缺乏安全认证以及安全管制 需要将Memcached服务器放置在防火墙（iptables）之后 Linux平台 (CentOS)安装Memcached 安装依赖 yum -y install libevent libevent-devel 以下方式任选一种 方式1. 自动安装方式 yum -y install memcached # 方式2. 源代码编译方式安装 wget https://memcached.org/latest mv latest memcached-1.5.20.tar.gz tar -zxvf memcached-1.5.20.tar.gz cd memcached-1.5.20 ./configure --prefix=/usr/local/memcached make && sudo make install # Linux平台启动 ./memcached -p 11211 -u root -m 64m 或者 ./memcached -p 11211 -u root -m 64m -d 或者 ./memcached -p 11211 -m 64m -d -u root -l 127.0.0.1 -c 256 -P /tmp/memcached.pid # Linux平台服务进程查看 ps -ef | grep memcached #

Caching Zip Object With Django Memcached

由 二次信任 提交于 2020-01-16 17:26:41
问题 I am currently using Django and memcached to keep track of a Zip object like so: activeList_data = cache.get(active_list_key) if not activeList_data: activeTickers, activeName = get_most_active() activeList = zip(activeTickers, activeName) cache.set(1, activeList, cache_time) However, whenever I try to print the cache it just returns a blank list. Any ideas on where I am going wrong? Thanks EDIT : For reference here is my full code activeList_data = cache.get(active_list_key) # returns None

Disable cache digests in Rails 4

由 吃可爱长大的小学妹 提交于 2020-01-15 17:32:04
问题 I'm in the process of migrating a Rails 3 app to Rails 4. The migration was mostly fairly smooth, but one big problem I'm encountering is that my old Rails 3 code to expire my caches isn't working. I'm getting logs like: Expire fragment views/localhost:3000/cardsets/36?action_suffix=edityes (0.0ms) ... Read fragment views/localhost:3000/cardsets/36?action_suffix=edityes/d8034b6e68ba30b5916a2ebb73b68ffe (0.0ms) This turns out to be because Rails 4 brings a new funky kind of caching, cache

What is the best way to create persistent memcached connections under mod_perl?

由 别等时光非礼了梦想. 提交于 2020-01-15 12:38:46
问题 I know there is a module like Apache::DBI which allows to use persistent connections to database under mod_perl. Is there an easy way to make something like this? Could you recommend any memcached pooling package? 回答1: If you look at Apache::DBI's source code, you'll see that it just puts the database handle in a lexical scoped at the top of the package. It's easy enough to do this for Memcached. Make a new package, with a my $memcached; at the top, then have an init() method make the

Gevent ready memcache client?

由 ￣綄美尐妖づ 提交于 2020-01-15 10:57:28
问题 I see that there's a port of memcache client for gevent (https://github.com/hjlarsson/gevent-memcache), but it has not been updated since August 2010. Do you guys have any recommendation on a memcache client for using in gevent? 回答1: Found one, released and maintained by the guys at www.esn.me https://github.com/esnme/ultramemcache They also have a faster JSON decoder as well, coded in C with python binding. 回答2: There is the python-ultramemcache that give the same interface as python

Linux--session&cookis以及memcached服务器搭建

由 杀马特。学长 韩版系。学妹 提交于 2020-01-15 01:42:06
一. session与cookies Session：存储在服务器端，保存用户名、登陆状态等信息。 Cookies：由服务器下发给客户端，保存在客户端的一个文件里。 保存的内容主要包括：SessionID。 session与cookies相当于服务器与用户之间的通信凭证,session保存在服务器端记录用户的登录信息,cookies保存在用户端.这样的好处就是用户登录服务器提供的服务后,在给定的时间内就不用重复登录,用以提高效率.服务端session的信息保存有一定时限,当然这是为了保证用户信息的安全.由于服务端存在服务器集群,以及Nginx反向代理的轮询制度,使得每一次为用户提供服务的服务器不可能是同一台服务器,所以需要建立一个数据库来记录用户的session信息,并且共享给后端所有集群服务器,保证用户不需要每一次使用服务时,而重复的认证ID信息,有利于提高用户的工作效率. 步骤 1.PHP的本地Session信息 1.1部署后端LNMP服务器相关软件 注意:以下部署LNMP服务器的操作，需要在两台后端服务器做相同的操作，下面我们以一台Web2服务器（192.168.2.200）为例，对Web1服务器执行相同操作即可。 1.1.1—使用yum安装基础依赖包 yum -y install gcc openssl-devel pcre-devel 1.1.2–源码安装Nginx

How does incr work with expiry times?

由 十年热恋 提交于 2020-01-14 11:57:46
问题 In memcached (appengine api implementation), how does expiration interact with incr()? There isn't a time argument for incr(), but what happens if I add the key with another call rather than using the initial_value param, like so: memcache.add('testcounter', 0, time=60*90) newcnt = memcache.incr('testcounter') will testcounter still expire in 90 minutes? Whether or not I call this again in that time? 回答1: In the memcache overview of GAE they say: "The app can provide an expiration time when a

In-memory cache with LRU expiration

由 半城伤御伤魂 提交于 2020-01-14 05:57:09
问题 I am looking for an in memory cache for my PHP powered website. It is not high traffic website, I just want to cache data and parts of some pages for improving performance. The data size will vary from a few bytes to few kBs. I am currently using xCache, and have no problem with it. Is it better to switch to memcached or redis? Are there any better options? 回答1: If you don't have any obvious problem, why do wanna switch right now? Memcached or redis are probably better but if you don't need
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