|Just another Perl shrine|
Now that's a classic XY problem statement! One usually gets better help by asking about how to achieve the goal, not how to implement the technique one has already decided is the way to achieve it ;-)
I can think of no reason why one should ever have to concern oneself with which CPU core was used by a given worker. You should be able to write a program where you don't even have to concern yourself with workers.
It sounds like from your problem description that you might need some kind of job queue. You can achieve this in many ways, but if you are already using MCE for parallelization, you can use MCE::Flow and MCE::Queue to handle enqueuing jobs based on the output of the first task handled by multiple workers. Look at the demo shown in the MCE::Flow doc.
Hope this helps!
The way forward always starts with a minimal test.
In reply to Re^5: Create parallel database handles... (MCE::Loop)