Compare performance and resource usage between sage VM and sage docker container

[embray]

FWIW here is some very rough resource usage on Windows 7 using docker. More detailed analysis may follow another time. Also what are some good performance tests for sage?

Here is Windows 7 with no other foreground applications running, and before running Docker:

Here the Docker terminal has been started; this means the boot2docker Linux VM, which runs the docker engine, is running with VirtualBox:

Here I've started a container for the sagemath-jupyter image (but not done anything with it yet):

And finally, here's after starting chrome, connecting to the notebook server, and starting a new notebook with the sage kernel: