kola: increase cgroup memory limit to 50MB

[dongsupark]

With 30MB, docker run still fails in some cases.
Let's increase the cgroup memory limit to 50MB, to avoid such failures.

Other details are already described in #79.

[pothos]

What about --shm-size=1m, --memory-reservation=10m, and --kernel-memory=10m? Maybe those could be related to the crash?

[dongsupark]

I am not sure I understand the question.

In the code, each line is interpreted as a set of parameters for each docker run command. So each line is independent of each other.
--kernel-memory=10m becomes docker run --kernel-memory=10m, and it has nothing to do with the --memory option.

AFAIK there has been no case where the --kernel-memory=10m test failed.
Failed one was either --memory=30m --memory-swap=30m or --memory=30m --oom-kill-disable=true.

[pothos]

Ok, thanks for explaining!