Multiple interpreters retaining huge amounts of memory

[Rhamphoryncus]

On Feb 2, 10:32 pm, Graham Dumpleton <Graham.Dumple... at gmail.com>
wrote:
> The multi interpreter feature has some limitations, but if you know
> what you are doing and your application can be run within those
> limitations then it works fine.

I've been wondering about this for a while.  Given the severe
limitations of it, what are the use cases where multiple interpreters
do work?  All I can think of is that it keeps separate copies of
loaded python modules, but since you shouldn't be monkey-patching them
anyway, why should you care?