Most people who have their site go down aren't using proper caching so their Wordpress sites are evaluating the PHP and querying the MySQL database with each page load. This is extremely wasteful of processor cycles and memory, hence the site goes down when the server gets overloaded. The proper way to do it is to have caching in place such that it evaluates once and saves the result as a static HTML page. Then the static page can be served very quickly and efficiently.
It looks like this is what he is doing. I'd be willing to bet the site will stay up.
If it survives does that mean that the Pi can essentially saturate its network connection if it doesn't need to do any "real" work? I bet you could stick it in a rack in front of the grownup servers to act as a haproxy dongle, how hard can it be?
I officially dub it the cutest webserver.. in the world.
> Pi can essentially saturate its network connection
There are a few caveats here. If you're serving the same content ( < 512MB ) and it's static, then yeah, why not? Serving static content isn't CPU intensive and you're serving directly from RAM.
Let's not forget the caveat of network speed (4MB/s tops), and the other caveat of alleged stability concerns when saturating the network link AKA USB system.
It looks like this is what he is doing. I'd be willing to bet the site will stay up.