Memcached is an in-memory key-value store for small chunks of arbitrary data (strings, objects). It is commonly used as a cache to speed access to frequently used data.

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What would cause Memcached to Hang for 2+ seconds?

I'm going nuts trying to scale memcached. From their site: Memcached operations are almost all O(1). Connecting to it and issuing a get or stat command should never lag. If connecting lags, you ...
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PHP on several servers with session-sharing

there's certanly other threads about this, but I have one more question. We are about to scale the website at work to have more than one server. And we need to share the sessions between the servers. ...
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137 views

Memcached memory consumption?

Server info: cPanel / 4GB The conf file as below: #Memory a user -m 128 # default port -p 11211 # user to run daemon nobody/apache/www-data -u nobody # only listen locally -l 127.0.0.1 Does it ...
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Are there any drawbacks to running memcached on a Unix domain socket instead of the network (assuming one server)?

I’m setting up a Django website to use memcached to cache its pages. (The content of each page won’t change very often at all, so I’m hoping that most of the site will be served from memcached most ...
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531 views

Nginx, PHP-FPM and Memcached

I have Wordpress installation running on two web servers powered by Nginx. I configured Memcached on both servers and I'm using W3 total cache plugin for Memcached: What's the recommended solution ...
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1answer
250 views

Does a RewriteCond that checks for the existence of a file cause high IO latency?

I am setting up an apache configuration to check for the existence of a file. If the file exists, then the server will redirect to a maintenance page. If not, the application will get served up ...
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Troubles with memcache.so

I've been asked to launch a site that someone else built. It is a Wordpress shop site that needs Memcached to run, and I've been having troubles getting Memcached and the memcache php plugin working ...
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101 views

MediaWiki Multi Site + Memcached

I have multiple mediawiki installations, and I'm wondering if it's safe to allow them to all use the same memcached server. Are there any "gotchas" involved?
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1answer
140 views

difference between slab, page and chunk in memcached

what is the difference between slab, page and chunk in memcached? If we set -m 128, then how many slab, page, chunk we have? What is the benefit of slab?
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1answer
160 views

Tips setting up nginx as proxy for php and node frameworks

We have a current, soon-to-be legacy PHP app installed in production, served with apache. Working fine. Currently trying to add in new Node.js alpha stack, which we're planning to install alongside ...
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235 views

Enyim Memcached Client Caching same item on multiple servers

We have a memecached cluster of 5 servers. When we reviewed the cache keys it shows that the same item is showing up across 4-5 servers in the cluster. As I understand it, Enyim's default key hash ...
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Unable to load memcache.so extension

I built PHP from source with configure command './configure' '--prefix=/usr/local/php-5.2.8' '--with-config-file-path=/etc --with-config-file-scan-dir=/etc/php.d' ...
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269 views

Memcached logrotate file not being installed. Bug with memcached 1.4.2?

My memcached logs are getting huge (in excess of 5GB). This isn't a huge problem in itself. I can easily remove them. I've sourced the problem to the memcached 1.4.2 package not installing a ...
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1answer
98 views

Server performance worsened after a hardware upgrade: how should I reconfigure the server? [closed]

I'm running a site on an Ubuntu/Apache/Django/PostgreSQL stack. We upgraded our server recently from 1 processor with 2 Gb total RAM (with 0.5 Gb of that RAM assigned to memcached) to a new server ...
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1answer
233 views

how can I effect DNS Caching on PHP/Memcache application

In a very high loaded Ubuntu/PHP web server I found that the PHP line: $memcache->connect("int-aws_ec2.memcached.myapp.net",11211); sometimes takes ~5 secs. Replacing the url with the ip address ...
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1answer
174 views

Can a slow database cause a web app to hold up a memcache connection?

I have a php application that uses memcache and a back-end database At times we see high "current connections" in memcache and can't determine why. Why php "misses" from memcache and needs to go ...
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1answer
383 views

How does php know what memcached node to look for its data in?

I am new to the world of Memcached clusters If I have a php web application that is using memcache - how does it does its hash and decide what node to check for a particular value to avoid having to ...
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1answer
1k views

Optimizing Web Server(apache2+nginx+memcached+eaccelerator) for high-loaded heavy application

I have a server with (Apache2 + nginx as reverse proxy, memcached cache and eaccelerator). The application is Magento - it is very heavy, due to high modularity and a lot of php files(5000-10000+). ...
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1answer
162 views

Memcached on same servers as websites

I have a website that runs on 4 loadbalanced servers. These are Windows servers, each with 16 GB of memory. I need to move to a shared cache, so I was thinking of Memcached. However, budgetary reasons ...
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1answer
157 views

How to use Memcached

I read a bit about memcached but struggling to understand how exactly we use it. Is it a kind of server/application that we have to install on our machine? Is it a script that we have to include in ...
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1answer
285 views

Memcached and Django - When Ajax action is performed, ALL css and js is missing

I've got Django running and caching into Memcached. I have some ajax actions on a page and when those actions are performed, and the browser refreshd, the CSS and JS files are no where to be found. ...
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1answer
8k views

nginx with Memcache Vs Varnish

I was wondering if anyone has any comments / benchmarks / suggestions on Varnish Vs Memcache when used to serve content (usually 2-5kb JS file depending on the parameters in request; thousands of diff ...
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2answers
385 views

Taggable alternatives to memcache

I'm looking for a caching solution quite similar to memcache, but the one thing I sorely miss is invalidating content based on a tag. Many preprocessed results depend on multiple sources of data, and ...
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3answers
7k views

Multiple Memcached server /etc/init.d startup script that works?

I install memcached server via source and can get standard start up script installed for 1 memcached server instance, but trying several scripts via google, can't find one that works to manager auto ...
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memcached not restarting properly start-stop-daemon: warning: failed to kill 8175: No such process

im having some really weird and annoying issue with memcached. im running ubuntu server 10.04lts on a linode instance. i am using fabric with a django project and part of the fabric script allows the ...
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75 views

Should memcached be installed before or after cpanel?

I want to install memcached. I want to know if I should install cpanel first, or after the memcached installation
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Multiple AWS EC2 running Auto Scaling and Distributed Memcache

I'm planning to use distributed Memcache across a series of Linux web servers on Amazon EC2. These EC2s currently run auto scaling so will increase and decrease with load. I have used this post to ...
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1answer
1k views

Memcache Master and slaves

I'm using memcached-1.4.5-1.el5 & memcache-2.2.6 as php extension and memcached-1.2.8-repcached-2.2.1 for replication. The above packages are installed on 4 servers. How can I do the following? ...
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1answer
529 views

Connection errors when trying to use Memcache

I'm new to 'Memcache' but I've installed it and I think its' running, so far have I done the following correct? mkdir memcache wget http://pecl.php.net/get/memcache-3.0.6.tgz tar -xvfz ...
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Memcache basic configuration

I have installed memcache for a Drupal site with the memcached pecl extension. It's all running fine but I'm still struggling with the configuration settings. For instance , following advice on ...
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2answers
2k views

Cannot load Memcached in PHP on Gentoo

I am using Gentoo Base System release 2.0.3, apache-2.2.21-r1, php 5.3.8-pl0 and memcached-1.4.5. I have done the following: emerge dev-php/pecl-memcache emerge dev-php/pecl-memcached emerge ...
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Would Memcached help in this scenario?

I work for a large internet site where people can share large pieces of text with each other. We store most information in InnoDB databases, but the actual pieces of text are stored somewhere in text ...
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587 views

Does Memcached support IPv6

Has anyone used Memcached with IPv6? Can you provide any configuration tips, gotchas, or mention any stability issues you've had?
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Nginx+PHP-FPM+APC+Varnish+Memcached: High Mem/Swap consumption?

I've got running a VPS at Linode with 1024 MB RAM, Ubuntu 11.04 and Nginx+PHP-FPM+APC Varnish+Memcached active. I've setup a couple of test blogs with WordPress 3.2.1 and everything works, and the ...
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Protecting direct access to port 11211 via a browser (memcached)

When I recently discovered about accessing ports via your browser at a domain level. Example, I accessed my domain at port 11211, I got an output of this: ERROR ERROR ERROR ERROR ERROR ERROR ERROR ...
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Problems installing memcached

I am trying to follow the instructions here to install Memcached on a CentOS machine, and I'm not having much luck. The instructions say to first enable rpmforge repository as follows: rpm -Uhv ...
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1answer
3k views

Memcached Cluster - better to have 3 smaller instances or 2 mediums ones?

Currently I have 2 small servers in an memcached cluster. We are approaching out limits with them and need to grow. What are the pros/cons or going adding another small instance compared with having 2 ...
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3answers
825 views

Copy MySQL to RAM as a poor man's memcached replacement?

What about this idea: I've got a 4GB MySQL database, with few UPDATEs. On system startup I copy it to RAM and run it from there. Every couple of hours or even on UPDATES, I dump it to disk. ...as ...
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How do I get php-memcached extension to work with SASL on RHEL6

I have RHEL6.1 with php. I've installed libmemcached-1.0.2 from src.rpm and compiled php-memcached 2.0.0b2. If I try to setSaslAuthData('user','pass') and write something to memcached (Couchbase ...
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memcached and PHP … massive lag with sessions

I'm working on a new server built with Unbuntu 10.04, running php-fastcgi, nginx, and memcached. phpinfo() script loads and works great, same as a test memcached script. For any script using ...
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1answer
856 views

How do I monitor memcached evictions?

How do I monitor memcached to know if / how many evictions are occurring, and how much memory is used/free.
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increasing memcached limit size

I am having issues with the limit size of my memcached: How do I increase the limit_maxbytes? as the bytes_written is more than the limit_maxbytes?
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687 views

Better performance with memcached cluster or local memcaches?

I have a small cluster of servers balancing a Java web app. Currently I have 3 memcached servers caching data and all web apps shares all 3 memcached instances. I often get strange slowdowns and ...
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1answer
668 views

top on memcached server shows 110% cpu (memcached process) and 55% idle on cpu(s)

I tested on AWS ubuntu 10.04 memcached 1.4.2 When testing with memslap (different concurrent users numbers and different instance types (8G and 1.7G memory) Top shows 110% cpu on the memcached ...
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1answer
307 views

Memcached server: Is it a good practice to point two server urls to the same server?

I have a system where there are connections to a memcache server from several different files and servers. I would like to stay with one server but keep the option of increasing the number of ...
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1answer
983 views

How does upstream works in nginx (memcached_pass)?

Does nginx go to the next host in upstream block, if previous host not available or doesn't exist? upstream cache_cluster { 127.0.0.1:9000; //something on this port 127.0.0.1:11211; ...
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3answers
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Memcached memory usage

Is there any command line or php script which returns the memcached total memory usage?
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603 views

Memcached has to start by nobody? How to start it?

How to start the daemon by nobody? Do I have to start as nobody? I have only one box. So how many ports can I give to the daemon?
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1answer
160 views

Choose which memcache version

For memcached server we are running on version 1.4.5, and the application is built with PHP 5.3.6 and memcache (http://pecl.php.net/package/memcache) version 3.0.5 Currently we have 2 memcached ...
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2answers
2k views

Multiple Magento web servers, single instance memcache issues

I have two web servers with a Magento instance on both. Each shares the same httpd.conf, php.ini and my.cnf, along with local.xml and config.xml magento configuration files. I have another server ...