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Multiplicity - what the heck is it?

by redhotpenguin (Deacon)
on Jul 22, 2010 at 18:47 UTC ( #850886=perlquestion: print w/ replies, xml ) Need Help??
redhotpenguin has asked for the wisdom of the Perl Monks concerning the following question:

Can someone give a good explanation of -Dusemultiplicity that I don't need a lot of perlguts knowledge to understand?

Comment on Multiplicity - what the heck is it?
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Re: Multiplicity - what the heck is it?
by redhotpenguin (Deacon) on Jul 22, 2010 at 18:57 UTC

    An IRC conversation with Gozer that helped me understand more about it

    <phred> multiple interpreter instances in the same process -
     <gozer> phred: theory: yup, pretty much
     <gozer> basically wraps up all interpreter state in a single interpreter structure
     <gozer> (as opposed to a bazillion globals)
     <gozer> so you can create 2 perl interpretersi n a single process
     <gozer> also does make tracking down leaks and stuff easier
     <phred> what good are two interpreters in one process?
     <phred> you're saying they both would 'point' to the same data structure instead of multiple globals?
     <gozer> phred: nope
     <gozer> interp1 = new interp
     <gozer> interp2 = new interp
     <gozer> interp1.eval("use DBI 1.99;")
     <phred> whoa nice
     <gozer> interp2.eval("use DBI 1.23;")
     <gozer> (all pseudo code)
     <phred> that would be a hosting super feature
     <gozer> that is all interpreter pools are implemented in threaded mpms
     <gozer> phred: yup
     <gozer> and you can do things like
     <gozer> interp3 = interp2.clone()
     <phred> thanks for the explanation

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