Write (or integrate) a stress/load testing suite for s-c-gateway

[spencergibb]

Try to get some early load metrics for the stability and performance of s-c-gateway.

[kakawait]

Do you have any idea on how to perform load/stress tests? For example using some tools like JMeter or Gatling?

[spencergibb]

I've used tools like those before.

[turgaycelik]

I performed some tests by using Apache HTTP Server Benchmarking Tool, ab. Results don't seem promising when compared to Netflix Zuul and Ngnix.

We are performing Gatling tests for Zuul and Ngnix. Since the current performance of Spring Cloud is not promising, we didn't include it as an alternative at least for now.

Experiment	Mean Time Per Request (ms)	Request Per Second
Nginx reverse proxy	32.085	6233.40
Zuul (after warmup)	28.422	7036.90
Spring Cloud Gateway	229.058	873.14

PS: Test server is AWS EC2 M4.2xLarge (Eight Core CPU, 32 GB of Memory)