Tag: memcache

About

memcached (pronunciation: mem-cache-dee.) is a general-purpose distributed memory caching system that was originally developed by Danga Interactive for LiveJournal, but is now used by many other sites. It is often used to speed up dynamic database-driven websites by caching data and objects in memory to reduce the number of times the database must be read. Memcached is distributed under a permissive free software license.[1]

Memcached lacks authentication and security features, meaning it should only be used on servers with a firewall set up appropriately. By default, memcached uses the port 11211. Among other technologies, it uses libevent.

Memcached's APIs provides a giant hash table distributed across multiple machines. When the table is full, subsequent inserts cause older data to be purged in least recently used (LRU) order. Applications using memcached typically layer memcached requests and additions into core before falling back on a slower backing store, such as a database.

From en.wikipedia.org/wiki/Memcache

 

Revisiting Faster PHP Sessions

"Simplicity is prerequisite for reliability." - Edsger W. Dijkstra. As our experience grows, we learn from past mistakes and discover what's truely important in reliable systems. When designing systems, simplicity is an often heard mantra, but it isn't getting applied nearly as much as spoken off. I'm guilty of this too. I think it's mainly because engineers love to, well, engineer : ) and will naturally try to outsmart problems by throwing more tech at it.

Redis PHP Introduction

Don't know Redis? Think Memcache, with support for for lists, and disk-based storage. You can use Redis as a database, queue, cache server or all of those combined. Let's see how you can use this power in your PHP apps.

Enhance PHP session management

In PHP, sessions can keep track of authenticated in users. They are an essential building block in today's websites with big communities and a lot of user activity. Without sessions, everyone would be an anonymous visitor. In system terms, PHP sessions are little files, stored on the server's disk. But on high traffic sites, the disk I/O involved, and not being able to share sessions between multiple webservers make this default system far from ideal. This is how to enhance PHP session management in terms of performance and shareability.