And now the weirdest thing: Enabling two CPUs on the virtual machine gave me the following weird results:
nginx: 31.92 [#/sec] apache: 10.63 [#/sec] rocket: 10.36 [#/sec] So 1000 request with a concurrency of 20 on 2 CPUs actually slows down apache and rocket. I thought that apache and rocket hit the memory limit so I raised the memory to 1024 but the results remained the same. Is this even possible? I can understand that the performance could stay the same with 2CPUs (the servers are not using the second one) but to actually drop the performance is not very intuitive. I guess the default configuration of apache and rocket should be improved since most of the servers have more than 1 CPU. Or maybe I just my environment.
