CyberCache Cluster is a high-performance key/value store designed to be used as Magento session store and cache back-end in high-load applications. Its architecture pursued two main goals:

• to fully utilize all CPU cores available in modern servers by performing not only store/load requests (coming from different sources), but also all maintenance tasks concurrently,

• to match Zend cache API as closely as possible to minimize any overhead.

In addition to the above, CyberCache is a web-centric server; so for instance:

• one of its stores is a session store fully aware of session data flows and supporting internal session locks preventing data corruption,

• it is user agent-aware and gives different data sources different priorities,

• it comes with native-code PHP extension (supporting PHP 7.0..7.3) guaranteeing most efficient data exchange with site code,

• it supports eight compressors; some of them (e.g. Brotli) were specially designed to perform best on web page data (CyberCache's internal optimizers constantly check stores and re-compress data to free up space and also make subsequent data load requests more efficient),

• it is shipped with cybercachewarmer utility that can be used to warm up cache servicing a magento site, as well as for a web site profiling,

• it supports replication (master/slave/both), binlogs (that can be played back), monitoring and control via specialized console app, more than 100 configuration options, on-the-fly configuration w/o server restart, saving and loading data stores, etc. etc. etc., you name it.

An overwiew of CyberCache features and architecture can be found in doc/whitepaper/whitepaper.md file. Once CyberCache is installed, one can get help by executing man cybercached (server configuration), man cybercache (console; it also has extensive internal help), and man cybercachewarmer.

First of all, CyberCache is free software distributed under GPL license, so you can utilize it and/or its components and source code [almost] any way you want. For instance:

• CyberCache can be used as highly efficient Magento session store and cache, especially suitable for big sites with, say, 50,000+ products.

• You can adapt CyberCache for any PHP-based framework or CMS having Zend framework as its core.

• C/C++ developers may benefit from various tools and techniques found in the source code; many solutions used during implementation are original.

As to the last item: as of the time of this writing, number of source code lines of the CyberCache Cluster project is 44,493 -- this does not include third- party libraries, as well as most scripts; so there's plenty of stuff, it was being developed over the course of three years, after all. What kind of stuff it is? Well, few examples:

• Many high-performance servers (e.g. nginx) use readily available networking libraries; one of the most popular is libevent. CyberCache contains networking support that was developed from scratch.

• CyberCache console does not use GNU readline library; instead, it has its own readline counterpart developed from scratch.

• Overall CyberCache architecture is based on queues and message exchange similar in concept to those found in Go programming language; in fact, Go was considered as potential implementation language early on. What we have in CyberCache now are Go-like queues and messaging system without Go.

  By the way, this is the main reason of why it is possible to confire the server on the fly w/o restarting it; almost all of its 100+ options (all but select few, maily those having to do with security) can be configured this way: even TCP data port, even queue sizes... Whatever the server is doing, it does not have to stop to change compression algorithm set, or process a request to save or load entire store, or do a health check, etc.

• Quite a few synchronization primitives were developed for CyberCache in the spirit of so-called lock-free programming; atomics were used whenever possible, and when waiting was inevitable, futexes (the most efficient system-level primitives available in Linux) were used for that.

If you do find CyberCache useful (in any way), please drop us a line: cybercache@cyberhull.com.

The CyberHULL Team.