How many req per second can a single mongrel server handle of RoR app.
sunkencity: try benchmarking with apachebenchab -n 10000 -c 10 http://127.0.0.1/or install siege (or some other tool).Use passenger. If you really need speed use rails metal to write your response, rails metal can certainly handle 150 requests per second on a single instance. But should one client be laggy, it will take down the whole server :)