rps bottleneck

[ghost]

I am running a GET on www.google.co.uk on a m3.xlarge (4 CPUs, 15GB RAM (high network)). I've input 2000 users, but I am unable to reach much more than 600 r/s when total CPU is less than 25% and used RAM is around 3GB. I wonder what the bottleneck is?

[vividhsv]

are you running in distributed setup....?

If no, you should run in distributed setup.Since there are 4 CPUs you could run 3-4 slaves so that all the CPUs are used.

If you are in standalone mode you will end using only one 1CPU to its max (100%). You can also see it in your stats 25% of total CPU is like 100% of one CPU among the 4 CPUS. So basically other 3 CPU's are not being used.

[ghost]

HI @vividhsv

I had no idea that Locust was CPU-bound, but you are exactly right. Thanks very much.

[cgoldberg]

careful.. running 600 rps against Google is essentially a DDOS attack.