Razvan Stanga

Imagine a high traffic website that needs post views as an algorithm to display posts on the homepage. 
This website also uses <a href="https://wordpress.org/plugins/vcaching/" rel="ugc">Varnish Caching</a>. So we need an AJAX based post views counter. 
Now imagine a minimum 5000 concurrent users browsing the website, so we can’t use the default “AJAX in Plugins” as live updates on the backend using update_post_meta will be very painful for the backend.
So what can we do ?
What if all these post views counts will be done in memory using Redis ? 
Then we run a cornjob using WP-CLI to sync the post views count in Redis to the WordPress database.
Redis Post Views was born.

Redis Post Views

Highly optimized post views counter using Redis

Daniel Bachhuber

Chris Reynolds

Matthew Boynes

Pantheon Systems

John Spellman

Josh Koenig

<a href="https://circleci.com/gh/pantheon-systems/wp-redis/tree/master" rel="nofollow ugc"></a>
For sites concerned with high traffic, speed for logged-in users, or dynamic pageloads, a high-speed and persistent object cache is a must. You also need something that can scale across multiple instances of your application, so using local file caches or APC are out.
Redis is a great answer, and one we bundle on the Pantheon platform. This is our plugin for integrating with the cache, but you can use it on any self-hosted WordPress site if you have Redis. Install from <a href="https://wordpress.org/plugins/wp-redis/" rel="ugc">WordPress.org</a> or <a href="https://github.com/pantheon-systems/wp-redis" rel="nofollow ugc">Github</a>.
It’s important to note that a persistent object cache isn’t a panacea – a page load with 2,000 Redis calls can be 2 full seconds of object cache transactions. Make sure you use the object cache wisely: keep to a sensible number of keys, don’t store a huge amount of data on each key, and avoid stampeding frontend writes and deletes.
Go forth and make awesome! And, once you’ve built something great, <a href="https://github.com/pantheon-systems/wp-redis/issues" rel="nofollow ugc">send us feature requests (or bug reports)</a>. Take a look at the wiki for <a href="https://github.com/pantheon-systems/wp-redis/wiki" rel="nofollow ugc">useful code snippets and other tips</a>.
<h3>WP-CLI Commands</h3>
This plugin implements a variety of <a href="https://wp-cli.org" rel="nofollow ugc">WP-CLI</a> commands. All commands are grouped into the <code>wp redis</code> namespace.
<pre><code>$ wp help redis

NAME

 wp redis

SYNOPSIS

 wp redis <command>

SUBCOMMANDS

 cli Launch redis-cli using Redis configuration for WordPress
 debug Debug object cache hit / miss ratio for any page URL.
 enable Enable WP Redis by creating the symlink for object-cache.php
 info Provide details on the Redis connection.
</code></pre>
Use <code>wp help redis <command></code> to learn more about each command.
<h3>Contributing</h3>
See <a href="https://github.com/pantheon-systems/wp-redis/blob/master/CONTRIBUTING.md" rel="nofollow ugc">CONTRIBUTING.md</a> for information on contributing.

WP Redis

Awesome!!


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Do a little dance

Works like a charm and significantly improves the page rendering speed for my website. Play nice with https://wordpress.org/plugins/batcache/. These two allow me to get literally light speed performance for static pages.

Works like a charm!

Back your WP Object Cache with Redis, a high-performance in-memory storage backend.

Redis Post Views vs WP Redis