Is my rails app using too much memory? (top output)

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
22305 root 17 0 893m 854m 2548 R 46 21.7 2:59.71
mongrel_rails
22302 root 16 0 646m 606m 2632 S 51 15.4 2:24.34
mongrel_rails

It seems to stay consistent at those numbers, but those seem very high.
I have a cluster running of two processes and that’s what I get for the
processes when I point a script that hits my server 100 times as fast as
it can.

Is it possible I have a memory leak?

Thanks for your help.