Hi, I would like to know is DO 512RAM suitable and enough to run HHVM in a 64-bit Ubuntu 14.04 LEMP Stack + Wordpress?

Appreciated all your help.

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There’s no reason why you shouldn’t be able to run a WordPress site with that setup. The thing to watch out for is MySql’s memory consumption. You’ll definitely want to set up a swap file to give you some breathing room in case of a memory spike. Looking into some sort of caching is always a good idea whether it’s a plugin like WP Super Cache or setting up Varnish in front of Nginx.

by Justin Ellingwood
Swap space can be used as an "overflow" area for your system when you run out of RAM. The operating system can store data that would normally be kept in RAM on the hard drive in a specially formatted file. In this guide, we'll demonstrate how to create and use one of these files in Ubuntu 14.04.
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