Very simply because VMs are not created equal.

A VM for Perl should have common Perl operations be single units in the VM. For instance Perl does a lot of hash lookups. That should be an opcode.

Java's VM creates something much closer to a virtual machine. (Note that not only does Java's VM not define a hash lookup as a basic operation, but Java doesn't either!) This is a bad fit for what Perl spends its time doing, you want your basic operations to be as fast as possible, and you want basic operations that can be mapped well to the Perl code.

Incidentally Perl 5 already has what is for all intents and purposes a VM. For obvious reasons that is a far more appropriate model for Perl 6 than Java's would be.

In reply to Re (tilly) 1: Questions On the Perl VM, Parrot, .Net, and the JVM... by tilly
in thread Questions On the Perl VM, Parrot, .Net, and the JVM... by eduardo

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.