Embedding multiple interpreters

[Chris Angelico]

On Fri, Dec 6, 2013 at 4:16 PM, Michael Torrie <torriem at gmail.com> wrote:
> On 12/05/2013 07:34 PM, Garthy wrote:
>> - My fallback if I can't do this is to implement each instance in a
>> dedicated *process* rather than per-thread. However, there is a
>> significant cost to doing this that I would rather not incur.
>
> What cost is this? Are you speaking of cost in terms of what you the
> programmer would have to do, cost in terms of setting things up and
> communicating with the process, or the cost of creating a process vs a
> thread?  If it's the last, on most modern OS's (particularly Linux),
> it's really not that expensive.  On Linux the cost of threads and
> processes are nearly the same.

If you want my guess, the cost of going to multiple processes would be
to do with passing data back and forth between them. Why is Python
being embedded in another application? Sounds like there's data moving
from C to Python to C, ergo breaking that into separate processes
means lots of IPC.

ChrisA