I am trying to optimize the interaction between two scripts I have.
Two things I thought of are the c++ program not terminating unless you manually kill it, or generating all info in python before feeding it to c++.
Explanation of the problem:
What the scripts do:
C++ program (not made by me, and I can't program in c++ very well): takes a 7 number array and returns a single number, simple. 
Python script (mine, and I can program a bit in python): generates those 7 number arrays, feeds them to the c++ program, waits for an answer and adds it to a list. It then makes the next array. 
In theory, this works. However, as it is right now, it opens and closes the c++ program for each call. For one array that is no problem, but I'm trying to upscale to 25k arrays, and in the future to 6+ million arrays. Obviously it is then no longer feasible to open/close it each time, especially since the c++ program first has to load a 130mb VCD file to function.
Two options I thought of myself were to generate all arrays first in python, then feed them to the c++ program and then analyze all results. However, I wouldn't know how to do this with 6M arrays. It is not important however that the results I get back are in the same order as the arrays I feed in.
Second option I thought of was to make the c++ program not quit after each call. I can't program in c++ though so I don't know if this is possible, keeping it 'alive' so you can just feed arrays into it at times and get an answer.
(Note: I cannot program in anything else than python, and want to do this project in python. The c++ program cannot be translated to python for speed reasons.)
Thanks in advance, Max.
Firstly, just to be pedantic, there are no C++ scripts in normal use. C++ compiles, ultimately, to machine code, and the C++ program is properly referred to as a "program" and not a "script".
But to answer your question, you could indeed set up the C++ program to stay in memory, where it listens for connections and sends responses to your Python script. You'd want to study Unix IPC, particularly sockets.
Another way to approach it would be to incorporate what the C++ program does into your Python script, and forget about C++ altogether.
Python and C++ script interaction