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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?

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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 - http://perl.apache.org/docs/2.0/user/intro/overview.html
    
     <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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[Veltro]: marto Well, what I mean is that I can remember reading about it somewhere and everyone responding that this could not be done. A while later everyone was proudly showing their app. Look what I can do!
[marto]: some statements are true at the time of writing. Some of these apps that 'determine' what you're playing just sample audio input and pass it to a cloud service for processing, so technically that 'app' isn't doing it.
[Veltro]: marto depends on how you define app. Doing the processing somewhere else, so it is not the same app? I don't think like that anymore.
[Corion]: Yeah, but calling some random cloud service is not really implementing that stuff yourself :) Also, I don't like to litter the world with my personal data, or random bits of recorded audio... Ideally, my computations never leave my network :)

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