HHVM Rocking in PHP World

Just read about HHVM again on Sitepoint after two years of its inception. HHVM compiles PHP code to bytecode and then on real time to native code.

HHVM is used by Facebook to serve billions of web requests per day. To date, HHVM (and its predecessor HPHPc before it) has realized over a 9x increase in web request throughput and over a 5x reduction in memory consumption for Facebook compared with the Zend PHP 5.2 engine + APC.
https://github.com/facebook/hhvm/wiki

It has improved at lot. It now has FastCGI, and Authoritative Cache. In Authoritative Cache, HHVM won't check cache is expired or not. Cache will be expired when you change your PHP file. On Production site, you won't update PHP files now and then but it makes HHVM faster.

On official website, we got Getting WordPress running with HHVM. You may find so many interesting posts there.

Here is another interesting comparison by Alessandro Tagliapietra on PHP, Nginx with OpCache, and HHVM. .

Server - concurrencyRequests per secondTime per request (ms)50% req served within (ms)90% req served within (ms)99% req served within (ms)100% req served within (ms)
Nginx 5.5 (OPcache) - 10 user7.391352.9371277159817551755
HHVM - 10 user182.6754.7435381109134

We see that HHVM is many times faster even with PHP 5.5 and OPCache. PHP 5.5 is faster than PHP 5.3.