Benchmarking Performance of node.js (cluster) with mysql pools : Lighttpd + PHP?

Question

Edit(2): Now using db-mysql with generic-pool module. The error rate has dropped significantly and hovers at 13% but the throughput is still around 100 req/

Answer 1

Aren't you using 10 maximum MySQL connections in Node.js, and 5000 maximum MySQL connections via PHP?

While you run your tests on either system, I would take a look at MySQL's "SHOW FULL PROCESSLIST".