Cgroups

Processing times are not comparable since different amounts of events were processed. (100 evts in the first and last case and 10 for case 2 and 3)

2 GB RAM (no cgroup)

(1 core VM)

8 GB RAM (no cgroup)

(4 core VM, 1 process)

8 GB RAM (cgroup: memory limit 2GB, swapiness 60)

(4 core VM, 1 process)

8 GB RAM (cgroup: memory limit 2GB, swapiness 60), VM swapiness 100

(4 core VM, 1 process)

Comparison

Looking at 4 different scenarios: The first and last one come the closest to being similar.

The 8 GB memory case doesn't use swap at all.

The 8 GB memory with cgroup limit does a lot of caching that increases the overall memory, which is inhibited by setting the swappiness of the whole VM in the last case.

-- GerhardFerdinandRzehorz - 2016-04-04