Good to see the huge amount of careful thought and effort you've put into constructing such a clear and eloquently phrased question. ;-)

> bur really need thing on Perl working in tandem

Do you need Perl working on Tandem Computers? If so, please provide some background and context on why that's important to you.

> IMHO it's urgent to have Perl working cooperatively side by side Julia smoothly, so how to set up to perfectly obtain so ?

Do you need Perl working side by side with the Julia programming language? Again, please tell us why this is urgent and important to you. What real-world problem are you trying to solve?

Update: Or do you urgently need Perl to work cooperatively side by side with Julia (and George) smoothly and perfectly while filming their latest romcom Ticket to Paradise in sunny Queensland?

This sort of question comes up so often, I keep list of links comparing Perl to other programming languages:

• Links comparing programming languages (see especially Perl in Scientific domain)