How to see nginx rps (requests per second)

[AndriesLouw]

If you've logging enabled in some sort, you could use a Visual Log
Analyzer, I know some of them work for Apache-style logs, but it
requires the overhead of having logging enabled for your webserver.

Such log-analysers don't need many resources, as they don't require any
interaction with requests served by nginx, they just read the logs nginx
produces every x seconds.

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,220831,220905#msg-220905