I was interested to see how nginx would play with Drupal 7 and how much performance boost I’d get as compared to Apache . As it turns out an extra ~50 requests a second and a lower overall system load (as measured by top).
I tested a fresh install of d7, with minimal modules, and with caching turned on on my laptop. The php was a stock Debian one. I had the APC installed in its out of the box Debian Squeeze configuration. Both apache and nginx were flooded with ab. I used a concurrency of 100 (as high as it goes) like this:
$ ab -c 100 -n 1000 http://d7/
d7 was set up as a namebased virtual server on both servers, and added to my hosts file. Of course benchmarks using ab are not a hugely realistic model of how an actual webserver gets used. Tools like siege are closer to reality, but hey, this is just my own curiosity.