init scale test framework

[allenlsy]

This PR is a starting point of scalability test.

It creates necessary functions to perform a simple test. It tests scaling up to 16 active gameservers from 1, 4, 16 standby servers respectively.

Uses openarena as testing game server to test scalability

• add functions scale_up and scale_clear to allocate new standing by servers. These method can also be used without scale-test.sh .
• add test cases regarding number of standby max servers

After running scale-test.sh, here is the result:

test 1: scale up to 16 servers from 1 standby server
Scale up time: 13s

test 2: scale up to 16 servers from 4 standby server
Scale up time: 34s

test 1: scale up to 16 servers from 16 standby server
Scale up time: 13s

Signed-off-by: Allen Leigh allenlsy@gmail.com

[dgkanatsios]

LGTM! YAML files reference the same GameServerBuild, right? Any way we can use one of them and then do kubectl scale gameserverbuild <name> --replicas X to do scaling?

[allenlsy]

LGTM! Wanna take and slightly modify your PR description and put it in a README? After this we can merge

Can you help update the PR description? I will add instructions to the readme, or a separate readme in this folder.

[dgkanatsios]

apologies, I wasn't clear. You don't have to modify the PR description itself, just whatever you copy and paste into the README. Hope it makes sense now!