This attribute is not really used at
the moment. The idea is that a container with a bigger size gets
more resources (CPU, memory) allocated than a container with a
smaller size. However, at the moment the argument is ignored by
'rce-container', which is responsible for launching the
containers. Therefore, it is only used to limit the number of
containers which can be run simultaneously on one machine. There
are also some other parts especially in the Machine/Container
class which are (partially) implemented, but are not used in the
'rce-container' process.