Listen and let’s all discuss this:
I’d dismiss the video on account of it being titled “Ruby and PHP can’t scale as good as Java”. That’s terrible English.
What’s there to discuss? Time and time again, people have built high availability systems with Ruby and PHP. This video is biased, without a single fact mentioned.
Of course someone will be biased towards their life creation.
Of course, every language has their own “fan base” or it just fits to someones’ way of thinking.
In the end, if you are SO into high availability / performance and what not - learn the assembly and have at it, it never gets better than that.
All these videos and tests are never accurate enough, there’s always going to be a comment for or against some tool. That’s the way the humans are.
On identical hardware, java can probably process orders of magnitude more transactions more than PHP or Ruby or probably anything but .NET or a native application (ie – C++).
That said, hardware is cheap and for web-scale stuff, infrastructure and application architecture matter much more than the underlying platform – can you cache it and scale it out is the real question. Anything truly significant will often end up using multiple languages and platforms to get where it needs to be.