I am currently in Beijing for a month as the VP of Technology for Fun+, a US/China based gaming company, spreading the joys of open-source I have an entire team to do benchmarks, study INNODB flushing, build new technologies, which I hope to open-source I will also post the results here. Our Stack is mostly on AWS with the following.
HA Proxy Load Balances the Web Tier
Web-Tier runs nginX and php-frm
Data is stored in a new Sharded mySQL layer, Gift platform is on MongoDB
Memcache is used to cache frequently accessed items to give state to our stateless Web-tier and reduce DB load, although we can run without it.
What I am focusing on is
When to cache and not to Cache
How to get the most out of mySQL and MongoDB especially on Index Design
Tools for DevOps by DevOps
I hope to have a lot of information to share in the next couple of weeks.