For version 4.0.1, we have added Quercus compilation support for other application servers including Tomcat, where before the interpreted mode was only available. The compiled mode is significantly faster than the interpreted mode (though the interpreted is still quite speedy compared to PHP on Apache). Quercus compilation will also work on Google App Engine, but there’s a requisite that files be pre-compiled.
People have been asking for Quercus compilation outside of Resin for a while now. Simply put, many of them like Quercus but they just cannot use Resin. The story is usually the same: they are locked into a particular application server and they have no say over which application server they use.
Don’t get me wrong, our main product and breadwinner is still Resin. But Quercus has the potential to appeal to a much wider audience, most of whom are unfamiliar with Caucho and Resin.
Quercus introduces people to Caucho and to our company philosophy. They’ll naturally be familiarized with our design goals, release schedule, and how we handle bugs and support. We are a small no-nonsense engineering workshop and hopefully people who have not known Caucho will recognize that in Caucho.